WO2005034761A1 - 生体光計測装置と脳波計測装置を組み合せた生体情報信号処理システムおよびそれに用いられるプローブ装置 - Google Patents
生体光計測装置と脳波計測装置を組み合せた生体情報信号処理システムおよびそれに用いられるプローブ装置 Download PDFInfo
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Definitions
- Bio information signal processing system combining biological optical measurement device and electroencephalogram measurement device, and probe device used for it
- the present invention relates to a biological information signal processing system in which a biological light measurement device and an electroencephalogram measurement device are combined and a probe device used for the same, and in particular, displays the biological light and electroencephalogram measurement results on a common display device, and
- the present invention relates to a highly-accurate bio-optical measurement device that eliminates useless measurement using measured electro-encephalographic signal data, and to an easy-to-install bio-optical measurement device and a probe device for an electro-encephalography measurement device that speeds up preparation work for measurement.
- a living body optical measurement device irradiates a living body, which is a subject, with light having a wavelength in the visible to near-infrared region, measures transmitted light that has passed through the living body while diffusely reflecting the inside of the living body, and measures the optics inside the living body. It is a device that images differences in characteristics.
- This biological optical measurement device measures biological metabolites such as hemoglobin, blood flow, etc., and easily measures biological functions with a low constraint on the subject and a non-invasive method on the living body. Because it can be used, its use in fields such as clinical medicine and brain science is expanding.
- the activation of higher-order functions related to brain thinking, language, sensation, movement, etc. is closely related to oxygen metabolism and blood circulation in the living body, and these are specific pigments in the living body ( Hemoglobin). Therefore, the visible light, which is easily absorbed by the specific dye, irradiates light of multiple wavelengths in the near-infrared region to multiple parts of the brain, and detects the transmitted light passing through the inside of the brain at multiple parts, and the light absorption power
- Japanese Patent Application Laid-Open No. 9-149903 discloses an apparatus for measuring changes in the concentration of metabolites in the brain and hemoglobin in blood by measuring the higher-order functions of the brain.
- Clinical applications of this biological optical measurement device include, for example, activation of hemoglobin in the brain, measurement of the state of change, and measurement of local intracerebral hemorrhage with the head as the measurement target.
- electroencephalogram signals generated from a living body due to similar brain function activities have long been used as brain disease diagnostic means as means for directly measuring brain nerve activity. That is, In the field of brain science, an electrode is brought into contact with the scalp etc. to measure the brain waves generated by the brain activity, and based on the brain wave signal wave, ⁇ wave, ⁇ wave, ⁇ wave in a specific frequency band) Attempts have been made to analyze higher brain functions such as intellectual functions such as language and motor functions.
- the signals of these two are signals associated with the same brain activity, but the physical quantities to be measured are different, so the signals have different information. Furthermore, the spatial and temporal characteristics have a complementary relationship. Attempts have been made.
- the brain when measuring higher brain functions such as thinking, language, and movement, the brain is stimulated via hearing, vision, etc., and changes in the state of the brain before and after that are stimulated.
- the brain function is diagnosed by imaging and comparing those images.
- the tips of the plurality of irradiation optical fibers and light receiving optical fibers of the probe device for a biological light measurement device may interfere with the measurement at predetermined positions on the head. It is necessary to dispose the hair separately for each optical fiber, and then to dispose a plurality of electroencephalogram electrodes of the probe device for the electroencephalogram measurement device while avoiding the position where the optical fiber is arranged.
- An object of the present invention is to enable an observer to easily understand a biological light signal and an electroencephalogram signal, to facilitate comprehensive observation of both signals, and not to obtain a single signal .
- An object of the present invention is to provide a biological information signal processing system in which the apparatus and an electroencephalogram measurement apparatus are combined.
- One aspect of the present invention is to display a biological light signal and an electroencephalogram signal measured by a biological light measurement device and an electroencephalogram measurement device on a common display device in association with respective measurement positions, and to comprehensively display both signals.
- This is a biological information signal processing system that organically combines a biological light measurement device and an electroencephalogram measurement device that enable observation.
- Another aspect of the present invention is a biological light measurement device and an electroencephalogram measurement device capable of acquiring biological light signal data corresponding to a predetermined brain state represented by brain wave signal data measured by an electroencephalogram measurement device, for example, an awake state.
- This is a biological information signal processing system that organically combines devices.
- Still another aspect of the present invention relates to a common holder attached to a subject, an irradiation optical fiber attached to the holder, and irradiating the subject with inspection light for measuring biological light, and an irradiation optical fiber.
- a light-receiving optical fiber that is attached to the holder at intervals and receives the transmitted light of the test light from the subject, and is attached to the holder in the middle between the irradiation optical fiber and the light-receiving optical fiber, and is brought into contact with the subject.
- FIG. 1 is a block diagram showing an outline of a biological signal processing system in which a biological optical measurement device and an electroencephalogram measurement device of the present invention are combined.
- FIG. 2 is a display example displayed on the display device by the biological signal processing display device in the biological signal processing system of the present invention, and a two-dimensional brain wave measurement image is further displayed on an image showing the head of the subject. The two-dimensional biological light measurement image is superimposed and shown above.
- FIG. 3 is another display example displayed on the display device by the biological signal processing display device in the biological signal processing system of the present invention, wherein an electroencephalogram signal and a biological light signal are displayed on an image showing the subject's head.
- a two-dimensional image showing the measurement position of the target, a selected position indicated by a leader line with an arrow, and changes along the time axis of the brain wave signal and the biological light signal at the selected position are displayed in parallel.
- FIG. 4 is still another display example displayed on the display device by the biological signal processing display device in the biological signal processing system of the present invention, showing a light irradiation position on a subject and a transmitted light detection position thereof.
- a two-dimensional biological light measurement image superimposed and displayed on a two-dimensional image, a selected position indicated by a leader line with an arrow, and changes along the time axis of the brain wave signal and the biological light signal at the selected position are displayed in parallel. Things.
- FIG. 5 Still another display example displayed on the display device by the biological signal processing display device in the biological signal processing system of the present invention, wherein the two-dimensional electroencephalogram measured image shown in FIG. The upper and lower relations of the biological light measurement image are reversed, and the former is projected on the first layer and the latter is projected on the second layer, and both layers are spatially separated and displayed.
- FIG. 6 is still another display example displayed on the display device by the biological signal processing display device in the biological signal processing system of the present invention, showing two images displayed in parallel showing the head of the subject. One shows the time course graph of the electroencephalogram measurement signal on the corresponding measurement position, and the other shows the time course graph of the biological light measurement signal on the corresponding measurement position.
- FIG. 7 Still another display example displayed on the display by the biological signal processing display device in the biological signal processing system of the present invention, wherein (a) shows the spatial distribution of the optical measurement signal, and (b) Shows the spatial distribution of the EEG measurement signal in the same measurement space, and (c) shows the spatial distribution of the product of the spatial distributions of (a) and (b).
- A is a time course graph of the intensity of the electroencephalogram measurement signal normalized by the maximum value along the time axis
- (b) is the light normalized by the maximum value along the same time axis.
- a time course graph of the intensity of the measurement signal, and (c) shows a diagram in which one of two orthogonal axes is an electroencephalogram measurement signal and the other is an optical measurement signal, and the intensity is plotted with time as a parameter.
- FIG. 9 is a block diagram showing an outline of a biological signal processing system including a stimulus applying device for a subject in one embodiment of the present invention.
- FIG. 10 is a diagram for explaining the application of a stimulus for alerting the subject using the brain wave level in the example of FIG. 9.
- FIG. 11 is a flowchart for explaining a processing procedure of applying a stimulus for alerting the subject using the brain wave level in the embodiment of FIG. 9.
- FIG. 12 is a diagram for explaining selection of optical measurement data using an electroencephalogram level in the embodiment of FIG. 9.
- FIG. 13 is a flowchart illustrating a processing procedure for selecting optical measurement data using an electroencephalogram level in the embodiment of FIG. 9.
- FIG. 14 is a diagram for explaining selection of optical measurement data using a level of a specific frequency in brain waves in the embodiment of FIG.
- FIG. 15 is a diagram for explaining selection of optical measurement data using the level of the amount of body motion in a modification in which a body motion detection device is used instead of the electroencephalogram measurement device in the embodiment of FIG.
- FIG. 16 is a flowchart illustrating a processing procedure for selecting optical measurement data using a body movement level in a modification of the embodiment of FIG. 9 described with reference to FIG. 15;
- FIG. 17 is a diagram for explaining the relationship between the degree of eye opening and the a-wave in the electroencephalogram in relation to the eye-opening monitor used in the embodiment of FIG.
- FIG. 18 is a diagram illustrating the difference between the measurement characteristics of optical measurement and brain wave measurement.
- FIG. 19 is a diagram showing an example of a stimulus application timing pattern for optical measurement and brain wave measurement in the embodiment of FIG. 9.
- FIG. 20 is a block diagram of an example of a sampling pulse generation circuit for optical measurement and brain wave measurement in the coordination control unit in the embodiment of FIG.
- FIG. 21 is a timing chart of a sampling pulse generated by the sampling pulse generation circuit of FIG. 20.
- FIG. 22 is a diagram showing another example of a pattern of stimulus application timings for optical measurement and brain wave measurement in the embodiment of FIG. 9.
- FIG. 23 is a cross-sectional perspective view of a part of the first embodiment of the probe device used in the biological signal processing system of the present invention.
- FIG. 24 is a perspective view of a main part of a second embodiment of the probe device used in the biological signal processing system of the present invention.
- FIG. 25 is a bottom view of the tip of FIG. 24.
- FIG. 26 is a schematic side view of a third embodiment of the probe device used in the biological signal processing system of the present invention.
- FIG. 27 is a schematic side view of a fourth embodiment of the probe device used in the biological signal processing system of the present invention.
- FIG. 28 is a schematic side view of a fifth embodiment of the probe device used in the biological signal processing system of the present invention.
- FIG. 29 is a bottom view of a main part of the probe device of the fifth embodiment in FIG. 28.
- FIG. 1 shows a configuration of a biological information signal processing system 100 according to the present embodiment.
- the biological information signal processing system 100 includes a biological optical measurement device 300, an electroencephalogram measurement device 400, and a biological signal processing display device 200 that inputs and processes and displays those signals.
- the probe device 50 for the biological light measurement device 300 and the electroencephalogram measurement device 400 is mounted on the head of the subject 140, and the probe device 50 for the system of the present invention includes a plurality of inspection light beams of the biological light measurement device 300. It consists of an optical fiber 102a for irradiation, an optical fiber 102b for receiving transmitted light thereof, a plurality of electroencephalogram electrodes 104 of an electroencephalogram measuring device 400, and a common rubber or plastic probe holder 101 for holding these at predetermined positions. Has been done.
- the biological signal processing and display device 200 includes a data input unit 210, a data storage unit 220, a data processing unit 230, a cooperative control unit 240, a display device 250, and a console 260.
- the time change signal of the subject's hemoglobin measured by the living body light measuring device 300 is input to the data input unit 210, transferred to the data storage unit 220, and stored. Information indicating the position of each measurement point and information on the measurement time are also added to the data, and are transmitted at the same time.
- the change in the electroencephalogram signal from the electrode placed on the head of the same subject measured by the electroencephalogram measurement device 400 is also input to the data input unit 210 together with information indicating the measurement time and each measurement point. Is transferred to the data storage unit 220 and stored.
- the data processing unit 230 performs comprehensive processing based on the data from these two devices and the added measurement time and measurement position information, and displays the result on the display device 250.
- the data may be displayed in real time during measurement or offline after measurement is completed, but the display methods described below are applicable to both.
- the biological light signal and the electroencephalogram signal are signals at a plurality of measurement points on the scalp, and information indicating the measurement position is stored.
- a display form of each signal for example,
- the biological information signal processing system 100 by appropriately combining and displaying them according to the purpose of the observer, comprehensive observation of the biological optical signal and the brain wave signal can be easily performed.
- the electroencephalogram measuring device 400 has an electroencephalogram electrode attached to a predetermined part of the subject's head, By observing the current, the neural activity of the brain can be captured as a unique signal at each point in the brain.
- the electroencephalogram signal is evoked by a large number of repetitive stimuli at a speed of 10-300 ms.
- the evoked electroencephalogram that measures the response, and the continuous electroencephalography that continuously measures the electroencephalogram over time. has been developed and widely used in clinical practice.
- the signals measured by the biological light measuring device 300 and the electroencephalogram measuring device 400 are as follows: the biological optical signal shows the time change of the hemoglobin change at each measurement point, the electroencephalographic signal shows the change of the electric signal at each time, In the continuous method, changes in potential in the time direction during the repetition period of the stimulus, and mainly changes in vibration of electrical signals over the entire measurement time are recorded and stored. The information on the subject's ID and other information, the measurement position, and the information on the measurement time are also recorded and stored in these two signals.
- Figure 2 shows a two-dimensional image obtained by EEG measurement among the measured signals, which is first superimposed and displayed on an image showing the head of the subject. It is a two-dimensional image of measurement superimposed and displayed. At this time, a hue different from the display of the two-dimensional image of the electroencephalogram measurement is used for the two-dimensional image of the biological light measurement.
- pseudo shades by mixing two or more specific colors are used, but in this example, in order to make it easy to distinguish both two-dimensional images, For example, different pseudo colors are used, such as red-blue phase for the former and yellow-green phase for the latter.
- the upper and lower relationship between the two display layers may be reversed, and the upper and lower relationship may be arbitrarily specified according to the wishes of the observer. Furthermore, by making one of the two layers of the image a translucent image, the relationship between the two can be easily observed.
- Time signal of EEG signal and biological light signal 7 shows an example of a drawer screen when graphics of source data are displayed in parallel.
- Figure 4 shows the above extraction screen displayed on a two-dimensional biological light measurement image, and easily displays the relationship between the two-dimensional distribution image and the time change of two signals of brain waves and biological light at a specific measurement point. Something has been done. The two signals of the brain wave and the living body light are measured at the same timing at the same measurement position, and the relationship between the two signals over time is displayed. The electroencephalogram graph and the biological light graph displayed side by side in FIG. 4 are measured at the same timing, and it is possible to grasp how the graphs of the electroencephalogram and the biological light change with time.
- This measurement point can be set arbitrarily using the console.When the brain wave is measured and the biological light is not measured, only the time change of the brain wave signal is displayed, the biological light is measured, and the brain wave is measured. When is not measured, only the time change of the biological light signal may be displayed.
- Fig. 5 shows the two-dimensional EEG measurement image and the biological light measurement image shown in Fig. 2 in reverse, with the two images spatially separated from each other.
- the two-layer two-dimensional image is displayed on the three-dimensional space at different heights so that the measurement position can be easily determined.
- the upper and lower relationship between the two display layers may be reversed, and the upper and lower relationship may be arbitrarily specified via the console 260 as desired by the observer.
- Fig. 6 shows a time course map screen that displays the time course graphs of EEG measurement and biological light measurement at each measurement position.
- the two time course graphs are displayed in parallel with each other.
- the relationship between the two signals at each measurement point can be easily observed.
- two types of data are displayed in parallel, and the mutual relationship between the signals is determined by the observer.
- the relationship between the two signals is mathematically processed and displayed, then The burden on the viewer can be reduced.
- Figure 7 shows the spatial distribution of the optical measurement signal (a) and the spatial distribution of the electroencephalogram measurement signal (b), multiplied by the value of the two data at each point of the two images representing the spatial distribution of the two signals.
- This is an example in which the result is newly constructed and displayed as a composite image (c).
- the composite image is emphasized at the part where the signal of both data increases at the same time, and the relationship between the two signals is clearly presented. Is done.
- the calculation of the two signals may use a function that is theoretically or experimentally optimized according to the observation phenomenon to be observed.
- the intensity of the electroencephalogram measurement signal (a) and the biological light measurement signal (b) at a certain measurement point are standardized with the maximum value, and these two data Is plotted on the orthogonal axis using time as a parameter to construct a figure (c) that represents the time relationship at a certain measurement point with both data.
- the number of phase relations at each measurement point, the phase difference, or the area of the figure display them on a two-dimensional image.
- FIG. 9 shows an overall configuration diagram of another embodiment of the biological information signal processing system of the present invention.
- This embodiment is a system in which an optical measurement device and an electroencephalogram measurement device are combined.
- a plurality (two in the illustrated example) of light sources 301 generate near-infrared light having a wavelength of about 600 to 1200 ⁇ m, which easily transmits a human body.
- the near-infrared light generated from the light source 301 is guided through an optical fiber to an optical directional coupler (optical coupler) 302 to be mixed and transmitted by a single optical fiber 102a for irradiation light. Be combined.
- the tip of the optical fiber 102a is attached to the head cap 101 so that it can be held at a desired position on the head of the subject 140.
- the tip of an optical fiber 102b for condensing light is fixed to the head cap 101, and guides the signal transmitted light returning to the outside while scattering from the inside of the head of the subject 140 to the photodetector 303.
- the photodetector 306 is constituted by a photodiode, a photomultiplier, or the like, and converts incident signal light into an electric signal.
- the signal light converted into an electric signal by the photodetector 306 is input to a plurality (two in the illustrated example) of phase detectors (detectors) 307.
- the phase detector 307 performs filtering with reference to the modulation frequency set for each light source 301, and outputs the amount of signal light corresponding to each light source 301 to the AZD converter 309.
- the AZD converter 309 converts the detected light amount of the signal light into digital data and outputs the digital data to the optical measurement control device 310.
- the optical measurement control device 310 controls the light intensity of each light source 301, the amplification degree of the photodetector 306, and the like via a driving device 308 of the light source 301 such as a laser diode. Control.
- the optical operation device 311 uses the detected light amount of each light source output from the AZD transformer 309 to generate near-infrared light passing through the same part of the subject 140.
- the two or three kinds of pair force also calculate the amount of change in the oxygenated hemoglobin and the total hemoglobin in the subject 140.
- the optical measurement data as a result of the calculation is displayed on a monitor 250, which is a display device, as a numerical value or an image, and is stored in the memory 220.
- the stimulus giving device 521 is a device provided near the head of the subject 140, for example, to give a stimulus to the subject 140 by sound or video.
- the electroencephalogram measurement device 400 includes an electroencephalogram electrode 104 installed on the head of the subject 140, an electroencephalogram reception device 431, and an electroencephalogram calculation device 432.
- the electroencephalogram receiving device 431 receives the change of the electroencephalogram detected by the electroencephalogram electrode 104, displays it on the monitor 250, and outputs it to the electroencephalogram operation device 432.
- the electroencephalogram calculation device 432 detects electroencephalograms such as ⁇ waves and j8 waves based on the input electroencephalograms, and detects the state of the subject 140 such as physical condition (eg, drowsiness) based on the detected electroencephalograms.
- the calculation result such as the magnitude or ratio of the ⁇ wave or the j8 wave obtained by the electroencephalogram calculation device 432 is output to a display screen 522 provided in the stimulus giving device 521.
- the stimulus giving device 521 outputs a trigger signal 523 to the optical measurement control device 310 when the magnitude or ratio of the input ⁇ wave or j8 wave exceeds or falls below the set value, and stops the optical measurement, It is configured to control pause and start.
- the optical measurement control device 310 starts the optical measurement by the trigger signal 523 output from the stimulus applying device 521 in accordance with the state of the brain of the subject, for example, the awake force. , Pause and stop.
- the operation and usage of the present embodiment configured as described above will be described in detail below.
- a curve 601 in FIG. 9A shows a temporal change in the arousal degree of the subject 140 calculated by the electroencephalogram operation device 432.
- a line 602 in FIG. 7A indicates a determination threshold value for alerting the user to the arousal level.
- the lamp 604 for alerting is turned on as shown in B of FIG.
- FIG. 11 shows an example of a procedure in which the degree of arousal is calculated by the electroencephalogram calculation device 432, the degree of arousal is determined, and a stimulus for alert is given.
- the electroencephalogram calculation device 432 measures the electroencephalogram input from the electroencephalogram reception device 431 in real time (S1), and Fourier-transforms the electroencephalogram data of the immediately preceding fixed section (sampling cycle) at each sampling cycle. Conversion (S2).
- the obtained signal intensity of the ⁇ wave is displayed on the display screen 522 of the stimulus giving device 521 as the arousal level as needed.
- factors that call attention to the subject include, in addition to the arousal level, an attention intensity that can be measured from brain waves, or a body motion that can be measured by a myoelectric signal described later.
- the method of alerting is to display an image on the display screen 522 when measuring the response of the brain to sound, and to use sound when measuring the response of the brain to vision.
- the alert can be based on, for example, a change in the intensity or frequency of an alarm sound, a change in tactile sensation (temperature), or visual stimulus by an alert image or a graph of a calculation result.
- the calculation result of the electroencephalogram is displayed on the display screen 522 in the stimulus applying device 521.
- the subject 140 By feeding back sleepiness and a decrease in attention intensity to the subject 140, it is possible to perform brain function measurement by optical measurement while maintaining the desired activity of the brain, for example, in the state of being awake. it can. As a result, it is possible to reduce the waste of the obtained optical measurement data and reduce the calculation load of the optical measurement.
- the alert can be raised in exactly the same manner using the force j8 wave (14 to 33 Hz) described in the case of using the EEG wave.
- the j8 wave indicates that the person is in a state of high tension and attention and cognition, and the j8 wave is emitted when doing something that requires attention.
- ⁇ -waves are emitted, but since these ⁇ -waves are passive attention, they are different from the attention used in brain function measurement.
- the attention of the j8 wave is positive, it is preferable to use the change of the ⁇ wave to evaluate the attention.
- optical measurement data is collected over a plurality of sampling periods, and by adding them, noise included in the measurement data is reduced. Therefore, the measurement time under the same measurement conditions becomes longer, and if the brain state changes during that time, the collected optical measurement data may be wasted. Therefore, in the present embodiment, the electroencephalogram data 434 is sent from the electroencephalogram operation device 432 to the optical operation device 311, and the optical operation device 311 enables selection of optical measurement data sampled according to the activity state of the brain. I have.
- FIG. 12A is the same as FIG. 10A, and a curve 601 shows a temporal change in the arousal level (attention intensity) of the subject 140 calculated by the electroencephalogram calculation device 432.
- a line 602 in FIG. 7A is a determination threshold value for alerting the arousal level (attention intensity).
- a curve 605 in FIG. 3B represents a time change of the optical measurement data calculated by all the optical calculation devices 311 for the corresponding time. Then, in the electroencephalogram arithmetic device 432 or the optical arithmetic device 311, the attention intensity is determined according to the processing procedure shown in FIG. 13, and the optical measurement data is selected.
- the EEG data of an arbitrary measurement section A is Fourier-transformed (S11).
- the ⁇ wave in the EEG (4–7 Hz), which helps the subject to sleep and sleep. (S12).
- a force rejection is determined in which the obtained signal strength of the wave exceeds a predetermined determination threshold (S13). If the signal intensity of the ⁇ wave exceeds the judgment threshold, the section A is set as the addition section of the optical measurement data (S14), and if not, the section A is excluded from the addition section of the optical measurement data (S15). Then, the process proceeds to the next section (S16). In other words, the optical measurement data sampled in the sections 606 and 607 of FIG. 12B in which the attention intensity exceeds the determination threshold value 102 is added, and the optical measurement data in the sections other than the section is discarded without being added. .
- optical measurement data when the optical measurement data is stored in the memory 220, markers indicating the start point and the end point of the addition sections 106 and 107 are added and stored.
- the ⁇ wave signal intensity falls below the threshold value in a state of falling asleep, if you do not wake up halfway, you may fall asleep deeply. In some cases, it is better to evaluate. Therefore, according to the optical measurement control mode 1, optical measurement data that is out of the measurement conditions can be discarded, and the accuracy of optical measurement can be improved. In addition, the number of repeated measurements for improving the measurement accuracy can be reduced, and the actual measurement time can be reduced.
- FIG. 14 exemplifies respective waveform diagrams in a case where optical measurement data is selected based on brain waves of another specific frequency.
- A is a waveform diagram of an electroencephalogram
- b is an example of an electroencephalogram in a specific frequency band included in the electroencephalogram
- c is an example of a waveform of optical measurement data along the same time axis.
- the electroencephalogram in the specific frequency band falls below the judgment threshold value 608
- the optical measurement data is discarded, and the optical measurement data of the other sections 609 and 609 are added.
- Some brain diseases such as epilepsy, are uncertain when they occur. It is important to observe the state of the brain before and after a seizure of such a brain disease.However, since it is not possible to determine when the onset occurs, optical measurement must be performed for a long period of time, and the measurement of the subject is also difficult. There is a problem that the burden is large. In addition, a huge amount of optical measurement data must be stored for a long time, and a storage device with a huge storage capacity is required. Therefore, when an epileptic seizure is detected based on the diagnosis result of the electroencephalogram arithmetic unit 432, a trigger signal 435 shown in FIG.
- the optical measurement control device 310 When receiving the trigger signal 435, the optical measurement control device 310 stores only the optical measurement data for a certain period of time before that in the memory 220. Thereby, the storage capacity of the memory 220 can be saved.
- the electroencephalogram calculation device 432 sends the detection of the epileptic seizure to the stimulus giving device 521, and displays the fact on the display screen 522.
- the present embodiment it is possible to perform brain function measurement by optical measurement in a state where a desired activity or the like of the brain is maintained, for example, in a “woken state”. As a result, waste of the obtained optical measurement data can be reduced, and the calculation processing load of the optical measurement can be reduced. In addition, since the optical measurement data that matches the measurement conditions is selected and the optical measurement result is calculated, the accuracy of the optical measurement can be improved.
- a body motion detection device can be used in addition to or instead of the electroencephalogram measurement device.
- the body motion detection device includes a myoelectric electrode that is attached in contact with the neck of the subject 140, a myoelectric signal receiving device that receives a myoelectric signal detected by the myoelectric electrode, and a signal that is received by the myoelectric signal receiving device. And a body motion calculation device that calculates a body motion based on the myoelectric signal.
- the body motion calculation device can be configured to detect that the subject 140 has powered his / her head and feed it back to the subject 140, for example, by displaying it on the display screen 522 of the stimulus giving device 521.
- the attention of the subject is compared with the judgment threshold value (corresponding to 602 in FIG. 10) corresponding to the preset allowable value of the amount of body movement.
- the operation or use mode corresponding to the evocation mode and the optical measurement control modes 1 and 2 based on the brain state can be realized.
- the myoelectric signal is measured in real time, the myoelectric data force in the immediately preceding sampling period is determined, and it is determined whether or not the physical amount exceeds the determination threshold. If there is, an alert such as “do not move” is presented on the display screen 522.
- the waveforms of the myoelectric signal 612, body movement 613, and optical measurement data 614 at this time are shown in FIGS. 15 (a)-(c).
- the optical measurement data is discarded, and the sections not exceeding 616, 616 For, the optical measurement data is added.
- the myoelectric data force and the amount of body movement in the section A are obtained, and the body movement amount exceeds the determination threshold, and the power is determined.
- Data is excluded from the calorie calculation section, and if it does not exceed the judgment threshold, section A is set as an addition section for each section.
- FIG. 16 shows a processing example of the measurement mode specific to body movement.
- the task (movement, etc.) may not be started by the signal of the inspector.
- the movement of the mouth or hand is detected from the EMG signal, and a period in which the movement is equal to or greater than a certain threshold can be regarded as a task period.
- a certain threshold can be regarded as a task period.
- sections where it is difficult to measure brain functions by optical measurement with extremely large body movements can be excluded from the measurement data. That is, as shown in FIG. 16, the amount of body movement is obtained from the myoelectric data in the section A (S21). Next, it is determined whether or not the obtained body movement amount exceeds the first determination threshold Ta (S22).
- the optical measurement data of section A is excluded from the added section (S24).
- the amount of body motion does not exceed the determination threshold Ta, it is determined whether or not the power exceeds the second determination threshold Tb (where Ta> Tb) (S23). If the body movement amount exceeds Tb, that is, if Tb ⁇ body movement amount ⁇ Ta, the optical measurement data in the section A is set as an addition section (S25). On the other hand, if the amount of body motion is lower than Tb, the process moves to step S24, and the optical measurement data of section A is removed from the addition section. After completing these processes, the process moves to the next section (S26). Instead of step S21 in Fig.
- EMG data is measured in real time to calculate the amount of body movement, and instead of steps S24 and S25, when the amount of body movement is Ta, the baby stimulates the favorite image.
- the display screen 522 of the application device 521 and the amount of body movement> Ta or the amount of body movement is Tb an image that the baby does not like can be displayed on the display screen 522.
- images that the baby likes are displayed. If you want to suppress the body motion, you can use slow tempo animation. If you want to increase the body motion, use up-tempo animation.
- an eye opening monitor 450 that detects the open / closed state of the eyes is provided, and a detection signal 451 of the eye opening monitor 450 is input to the electroencephalogram operation device 432.
- the eye opening monitor 450 captures an image of the eyeball in real time using, for example, a CCD camera, and uses the area of the iris as an evaluation function to detect the degree of opening and closing.
- the eye-opening state is divided into a plurality of stages, such as a closed state, a half-opened state, and a fully-opened state. Based on this, a calibration curve 620 shown in FIG.
- the ⁇ -wave can be calibrated in the electroencephalogram calculation device 432 according to the eye-open state, so that the measurement accuracy of the ⁇ -wave can be improved.
- the stimulus content presented by the stimulus imparting device 521 can be made appropriate.
- optical measurement and electroencephalogram measurement have different physical quantities and measurement principles of the measurement target. That is, both optical measurement and electroencephalographic measurement measure changes in brain function with respect to stimulus, but in both cases, add sampling data multiple times for the same stimulus to improve the accuracy of the measured values. .
- the interval between stimulations is, for example, 0.1 to 1 second and the required number of additions is 20 to 200, whereas in the case of optical measurement, the stimulus interval is 15 to 30 seconds and the required number of additions is 5 — Ten times.
- stimulation can be applied and the reaction can be detected in a few tens of milliseconds. 10 to 15 seconds or more due to the power.
- the clock pulse divided by the first divider 242 is further divided by the second divider 244 to provide a stimulus and to be supplied to the optical measurement sampler 245.
- sampling pulses 631 and 632 are output from the sampling unit 245 and the sampling unit 243, respectively, and the optical measurement data and the brain wave data are sampled at the set timing.
- FIG. 22 shows another embodiment of the measurement cooperative control.
- the same stimulus for light measurement and the stimulus for brain wave measurement are used, and the stimulus is applied once for each of the light measurement and the brain wave measurement.
- Optical measurement The stimulation time of 635 is minimized, and the response to one stimulation is measured.
- the stimulus of the electroencephalogram measurement 636 also increases the number of measurements by applying a stimulus between the optical measurement 635 and the optical measurement 635. Ensure the required rest time before and after the light measurement stimulus.
- FIG. 23 is a cross-sectional perspective view showing one embodiment of a probe device 50 for a biological information signal processing system according to the present invention.
- a part of a rubber, plastic or cloth holder 101 is shown. Is cut off.
- a holder 101 is mounted on the head of a subject (living body).
- the holder 101 is provided with a plurality of irradiation optical fibers 102a for irradiating the head with inspection light such as near-infrared light and a plurality of light receiving optical fibers 102b for receiving transmitted light of the inspection light at a predetermined distance from each other. It is arranged in.
- Each irradiation optical fiber 102a is arranged in the middle of the adjacent light receiving optical fiber 102b.
- FIG. 23 only one irradiation optical fiber 102a and two light receiving optical fibers 102b are shown, but in practice, the plural irradiation optical fibers 102a and the plural light receiving optical fibers 102b are arranged in a lattice. It is located.
- Each of the optical fibers 102a and 102b is attached to the holder 101 by an optical fiber attachment 103.
- the optical fiber attachment 103 incorporates a fiber spring (not shown). The fiber spring is compressed when the optical fibers 102a and 102b are pressed against the head of the subject. At this time, the distal ends of the optical fibers 102a and 102b are pressed against the head of the subject by the restoring force of the fiber spring.
- a plurality of electroencephalograph electrodes 104 for measuring an electroencephalogram are attached to the holder 101 via an electrode spring 105 as an elastic body.
- Each electroencephalograph electrode 104 is arranged in the middle of the irradiation optical fiber 102a and the light receiving optical fiber 102b adjacent to each other. More specifically, each electroencephalograph electrode 104 is arranged at the center or almost the center of a line connecting the irradiation optical fiber 102a and the light receiving optical fiber 102b adjacent to each other.
- the electrode spring 105 is compressed when the electroencephalograph electrode 104 is pressed against the head of the subject. At this time, the electroencephalograph electrode 104 is pressed against the head of the subject by the restoring force of the electrode spring 105.
- the irradiation optical fiber 102a, the light receiving optical fiber 102b, and the electroencephalograph electrode 104 are simultaneously mounted on the head of the subject. Then, the contact state between the irradiation optical fiber 102a and the light receiving optical fiber 102b and the electroencephalograph electrode 104 and the subject's head is adjusted so that appropriate measurement can be performed. Thereafter, the test light is irradiated to the head of the subject via the irradiation optical fiber 102a. The transmitted light of the inspection light from the head of the subject is received by the light receiving optical fiber 102b and sent to the living body light measuring device main body 300.
- the living body optical measurement device main body 300 a physiological change in the living body is measured from the transmitted light transmitted by the light receiving optical fiber 102b.
- the output signal from the EEG electrode 104 The signal is sent to the electroencephalogram measurement device main body 400 via the lead wire 113 (see FIG. 26).
- the electroencephalogram measurement apparatus main body 400 measures the electroencephalogram of the subject.
- a fiber reflection member 106 made of a material that reflects visible light is attached to each fiber attachment 103.
- an electrode reflecting member 107 that also has a material force for reflecting visible light is attached to a position where the electroencephalograph electrode 104 is attached to the holder 101.
- the three-dimensional measurement positions of the irradiation optical fiber 102a, the light receiving optical fiber 102b, and the electroencephalograph electrode 104 can be grasped.
- the fiber reflection member 106 and the electrode reflection member 107 may have different colors or different shapes so that they can be easily identified.
- the fiber reflecting member 106 corresponding to the irradiation optical fiber 102a and the fiber reflecting member 106 corresponding to the light receiving optical fiber 102b can be easily made different colors or different shapes. You can identify it.
- the irradiation optical fiber 102a, the light receiving optical fiber 102b, and the electroencephalograph electrode 104 are attached to the common holder 101, so that the measurement is performed for measurement. Both the biophotometry and the electroencephalogram measurement can be performed while reducing the time and effort required for the setting.
- the brain function at an intermediate position between the irradiation optical fiber 102a and the light receiving optical fiber 102b is measured. In this example, the brain function between the irradiation optical fiber 102a and the light receiving optical fiber 102b is measured.
- the electroencephalograph electrode 104 is arranged in the middle, the measurement position by the biological optical measurement device 300 and the measurement position by the electroencephalogram measurement device 400 can be made to substantially match, and the biological optical measurement device 300 and the electroencephalogram measurement device 400 Can be combined to improve the overall measurement accuracy. Further, in this example, since the electroencephalograph electrode 104 is attached to the holder 101 via the electrode spring 105, the electroencephalograph electrode 104 can be firmly brought into contact with the head of the subject, and the electroencephalogram can be stabilized. Can be measured.
- FIG. 24 is a perspective view showing a main part of another embodiment of the probe device 50 for a biological information signal processing system of the present invention
- FIG. 25 is a bottom view showing the tip of the optical fiber of FIG.
- the distal ends of the irradiation optical fiber 102a and the light receiving optical fiber 102b are surrounded by a sleeve member 108 which also has a conductive material such as copper or brass.
- the sleeve member 108 is fixed to the distal ends of the irradiation optical fiber 102a and the light receiving optical fiber 102b.
- a liquid holding member 109 impregnated with a conductive liquid is filled between the sleeve member 108 and the optical fibers 102a and 102b.
- a conductive liquid for example, physiological saline is used.
- a porous member such as a sponge is used.
- the electroencephalograph electrode 110 is composed of a sleeve member 8, a liquid holding member 9, and a conductive liquid carrier held thereon.
- the electroencephalograph electrode 110 is connected to the electroencephalograph main body 400 via a lead wire.
- the optical fibers 102a and 102b are attached to a holder 101 (see FIG. 23) by a fiber attachment 103.
- the electroencephalograph electrodes 110 are integrally provided at the tips of the optical fibers 102a and 102b for measuring biological light, so that the optical fibers 102a and 102b are provided.
- the electroencephalograph electrode 110 can also be brought into contact with the head of the subject at the same time, and the labor required for setting for measurement can be reduced.
- FIG. 26 is a side view showing still another embodiment of the probe device 50 for a biological information signal processing system according to the present invention.
- a net-shaped holder 111 is mounted on the head of a subject.
- a plurality of irradiation optical fibers 102a, a plurality of light receiving optical fibers 102b, and a plurality of electroencephalograph electrodes 104 are attached to the net-shaped holder 111.
- Each of the optical fibers 102a and 102b is attached to a holder 111 by a fiber attachment 112.
- the fiber attachment 112 is provided with a slit (not shown) for passing a string constituting the holder 111.
- each electroencephalograph electrode 104 is arranged in the middle between the irradiation optical fiber 102a and the light receiving optical fiber 102b adjacent to each other. Further, each electroencephalograph electrode 104 is connected to an electroencephalogram measurement device main body 400 via a lead wire 113.
- the optical fibers 102a and 102b can be attached to the string of the holder 111 for attaching the electroencephalograph electrode 104, so that the time required for setting for measurement is reduced. It is possible to perform both biological light measurement and electroencephalogram measurement while reducing it.
- FIG. 27 is a side view showing still another embodiment of the probe device 50 for a biological information signal processing system according to the present invention.
- the irradiation optical fiber 102a and the light receiving optical fiber 102b are attached to the holder 111 by a fixture 114 having the same structure as the fixture 114 of the electroencephalograph electrode 104. Therefore, the mounting structure of the optical fiber to the holder 111 by the mounting tool 114 is the same as the mounting structure of the electroencephalograph electrode 104 to the holder 111.
- the electroencephalograph electrode 104 and the optical fiber 102a , 102b to the holder 111 can be made the same, so that the entire structure can be simplified, the labor required for measurement setting can be reduced, and stable setting can be performed. It comes out.
- FIG. 28 is a side view showing still another embodiment of the probe device 50 for a biological information signal processing system according to the present invention
- FIG. 29 is a bottom view showing a main part of FIG.
- the irradiation optical fiber 102a and the light receiving optical fiber 102b are attached to a gel-like fiber holder (protective gel) 115 via a fiber attachment 116.
- the gel fiber holder 115 covers at least a part of the head of the subject with a surface.
- the electroencephalograph electrode 104 is attached to a net-shaped holder 111 as an electrode holder.
- the fiber holder 115 is provided with a plurality of electrode surrounding portions 115 a surrounding side surfaces of the electroencephalograph electrode 104 as electrode engaging portions for engaging with the electroencephalograph electrode 104.
- Each electrode surrounding portion 115a is provided with a plurality of slits 115b for letting the string of the net-shaped holder 111 escape.
- the irradiation optical fiber 102a and the light receiving optical fiber 102b are attached to the fiber holder 115 in advance.
- the electroencephalograph electrode 104 is attached to a net-shaped holder 111.
- the optical fibers 102a and 102b and the electroencephalograph electrode 104 are placed on the head of the subject, first, a net-shaped holder 111 is attached to the head, and the upper force is applied to the fiber so as to cover the net-shaped holder 111. Attach holder 115 to the head. At this time, the electroencephalograph electrode 104 is fitted into the electrode surrounding portion 115a.
- the electrode surrounding portion 115a surrounding the electroencephalograph electrode 104 is provided, the electrode surrounding portion 115a is attached not only to the optical fibers 102a and 102b directly attached to the fiber holder 115 but also to the net-shaped holder 111. Also, the displacement of the electroencephalograph electrode 104 can be prevented more reliably. Therefore, both the biological light measurement and the electroencephalogram measurement can be performed at the same time while reducing the labor required for the measurement setting.
Abstract
Description
Claims
Priority Applications (2)
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US10/572,357 US7974671B2 (en) | 2003-09-19 | 2004-09-03 | Living body information signal processing system combining living body optical measurement apparatus and brain wave measurement apparatus and probe device used for the same |
EP04772805A EP1665988A4 (en) | 2003-09-19 | 2004-09-03 | SYSTEM FOR PROCESSING ORGANIZATION INFORMATION SIGNALS COMPRISING A COMBINATION OF A DEVICE FOR MEASURING THE LIGHT OF AN ORGANISM AND A DEVICE FOR MEASURING BRAIN WAVE AND PROBE USED THEREIN |
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JP2003-328573 | 2003-09-19 | ||
JP2003327354A JP2006187304A (ja) | 2003-09-19 | 2003-09-19 | 生体信号処理装置用プローブ装置 |
JP2003328702A JP4517613B2 (ja) | 2003-09-19 | 2003-09-19 | 生体信号処理装置 |
JP2003-328702 | 2003-09-19 | ||
JP2003-327354 | 2003-09-19 | ||
JP2003328573A JP4399666B2 (ja) | 2003-09-19 | 2003-09-19 | 生体信号処理装置 |
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WO2012150657A1 (ja) * | 2011-05-02 | 2012-11-08 | パナソニック株式会社 | 集中有無推定装置及びコンテンツ評価装置 |
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US20070083097A1 (en) | 2007-04-12 |
EP1665988A4 (en) | 2011-06-22 |
US7974671B2 (en) | 2011-07-05 |
EP1665988A1 (en) | 2006-06-07 |
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