DE102012023124B4 - Method and device for visualizing interventional instruments in magnetic resonance imaging via sequence-triggered energization with evaluation of the magnitude and phase images - Google Patents
Method and device for visualizing interventional instruments in magnetic resonance imaging via sequence-triggered energization with evaluation of the magnitude and phase images Download PDFInfo
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- DE102012023124B4 DE102012023124B4 DE102012023124.5A DE102012023124A DE102012023124B4 DE 102012023124 B4 DE102012023124 B4 DE 102012023124B4 DE 102012023124 A DE102012023124 A DE 102012023124A DE 102012023124 B4 DE102012023124 B4 DE 102012023124B4
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- magnetic resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/285—Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR
- G01R33/287—Invasive instruments, e.g. catheters or biopsy needles, specially adapted for tracking, guiding or visualization by NMR involving active visualization of interventional instruments, e.g. using active tracking RF coils or coils for intentionally creating magnetic field inhomogeneities
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
- A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B2018/1405—Electrodes having a specific shape
- A61B2018/1425—Needle
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/36—Image-producing devices or illumination devices not otherwise provided for
- A61B90/37—Surgical systems with images on a monitor during operation
- A61B2090/374—NMR or MRI
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
- A61B2090/3954—Markers, e.g. radio-opaque or breast lesions markers magnetic, e.g. NMR or MRI
Abstract
Verfahren zur Visualisierung eines oder mehrerer interventioneller Instrumente in der Magnetresonanzbildgebung über bildgebungssequenz-getriggerte zeitweise Instrumenten-Bestromung durch Visualisierungsstrom zur Erzeugung eines gewünschten Störmagnetfeldes zur Störung des magnetischen Grundfeldes des Magnetresonanztomographen, der auf vordefinierten Leiterstrukturen mittels Regelung eines anpassbaren Gleichstroms oder Gleichstromanteils des oder der mehreren Instrumente fließt, mit Auswertung der Magnituden- und Phasenbilder, dadurch gekennzeichnet, dass der Visualisierungsstrom für ein oder mehrere dieser Instrumente unabhängig von der gewählten Bildgebungstechnik der Magnetresonanz nur zu Zeiten geschaltet wird, in welchen keine bezüglich der Ortskodierung zur Ermittlung der Darstellung der Anatomie störungsanfälligen Bildgebungsgradienten geschaltet sind, und dass durch eine Überlagerung des so erhaltenen Instrumentenbildes als Phasenbild mit dem gleichzeitig aufgenommenen Magnitudenbild mit Darstellung der Anatomie eine präzise Instrumentenlokalisation ermöglicht ist.A method of visualizing one or more interventional instruments in magnetic resonance imaging via imaging sequence triggered temporal instrument energization by visualization current to produce a desired perturbing magnetic field perturbing the magnetic field of the magnetic resonance tomograph based on predefined conductor structures by controlling an adjustable DC or DC component of the one or more instruments flows, with evaluation of the magnitude and phase images, characterized in that the visualization current is switched for one or more of these instruments, regardless of the selected imaging technique of magnetic resonance only at times in which switched with respect to the spatial encoding for determining the representation of the anatomy failure prone Bildgebungsgradienten are, and that recorded by a superimposition of the thus obtained instrument image as a phase image with the same time Magnitude image showing the anatomy enables precise instrument localization.
Description
Verfahren und Vorrichtung zur Visualisierung interventioneller Instrumente in der Magnetresonanzbildgebung über sequenz-getriggerte Bestromung mit Auswertung der Magnituden- und Phasenbilder.Method and device for visualizing interventional instruments in magnetic resonance imaging via sequence-triggered energization with evaluation of the magnitude and phase images.
Die Visualisierung von Instrumenten bei MRT-geführten Intervention wird üblicherweise über den Paramagnetismus des Instrumentenmaterials realisiert. Das magnetische Grundfeld des Tomographen wird in der Nähe des Instruments verzerrt, das Instrument lässt sich über Artefakte visualisieren (zum Beispiel „IEEE TRANSACTIONS ON MEDICAL IMAGING”, Bd. 19, Nr. 12, Dez. 2000, S. 1248–1252).The visualization of instruments in MRI-guided intervention is usually realized via the paramagnetism of the instrument material. The basic magnetic field of the tomograph is distorted in the vicinity of the instrument, the instrument can be visualized via artifacts (for example "IEEE TRANSACTIONS ON MEDICAL IMAGING", Vol. 19, No. 12, Dec. 2000, pp. 1248-1252).
In der Literatur sind neben der passiven Visualisierung auch aktive Techniken beschrieben, bei welchen über am Instrument angebrachte elektrische Leiter gezielt magnetische Störfelder in dessen Nähe erzeugt werden (
Der in den Patentansprüchen präzisierten Erfindung liegt das Problem zugrunde, dass bei Instrumentenvisualisierung über die magnetischen Eigenschaften des Materials (magnetische Suszeptibilität) die Grundfeldstörung kontinuierlich und in immer derselben Ausprägung vorhanden ist, d. h. die Größe der Artefakte nicht sequenzunabhängig steuerbar ist und die Störung auch zu Zeiten in der Sequenz vorhanden ist, zu denen die Ortskodierung erfolgt. Ferner sind insbesondere bei der sogenannten Spinecho-Bildgebungsmethode suszeptibilitätsbedingte Artefakte zu gering, um in dieser Technik eine sichere Visualisierung der Instrumente zuzulassen. Die Artefaktgröße hängt bei allen Bildgebungstechniken von der Grundfeldstärke ab.The specified in the claims invention is based on the problem that in instrument visualization on the magnetic properties of the material (magnetic susceptibility), the basic field disturbance is present continuously and in always the same expression, d. H. the size of the artifacts can not be controlled independently of the sequence and the disturbance is also present at times in the sequence to which the spatial coding takes place. Furthermore, especially in the so-called spin echo imaging method, susceptibility-related artifacts are too small to allow safe visualization of the instruments in this technique. Artifact size depends on the basic field strength for all imaging techniques.
Diese Probleme werden durch das Verfahren gemäß dem Patentanspruch 1 sowie durch die Vorrichtung gemäß dem Patentanspruch 3 gelöst.These problems are solved by the method according to the patent claim 1 as well as by the device according to the patent claim 3.
Die Verzerrung des Grundfeldes bei magnetisch neutralem Instrumentenmaterial über elektrischen Strom ermöglicht die Steuerung der Artefaktgröße über die Stromstärke. Messungen bei verschiedenen Stromstärken verbessern die Bestimmung der realen Instrumentenposition im Artefakt; eine Bestromung nur in Zeiten, in welchen kein Schichtselektions- und kein Lesegradient oder korrelierte Gradienten eingeschaltet sind, verhindert eine fehlerhafte Ortskodierung in der Nähe des Instruments. Die Artefaktgröße ist unabhängig von der Grundfeldstärke des Tomographen.Distortion of the fundamental field of magnetically neutral instrument material via electrical current allows the artifact size to be controlled by current intensity. Measurements at different current intensities improve the determination of the real instrument position in the artifact; current supply only in times in which no slice selection and no read gradient or correlated gradients are switched on prevents incorrect spatial coding in the vicinity of the instrument. The artifact size is independent of the basic field strength of the scanner.
In Sequenzen vom Spinechotyp können Auslöschungsartefakte erzeugt werden, wenn die Störung sequenz-getriggert beispielsweise nur vor bzw. nach dem Refokussierungspuls geschaltet wird. Das Spinecho-Phasenbild zeigt dann nur Phasenlinien um das Instrument herum, alle statischen Feldinhomogenitäten haben im Spinecho-Bild keinen Einfluss. Zusammen mit dem gleichzeitig aufgenommenen Magnitudenbild mit Darstellung der Anatomie ist so durch Überlagerung eine präzise Instrumentenlokalisation möglich.In spine-type sequences extinction artefacts can be generated if the disturbance is triggered in a sequence-triggered manner, for example, only before or after the refocussing pulse. The spin echo phase image then only shows phase lines around the instrument, all static field inhomogeneities have no effect in the spin echo image. Together with the simultaneously recorded magnitude image with representation of the anatomy, a precise instrument localization is thus possible by superposition.
Ein Ausführungsbeispiel für die temporäre Bestromung gemäß den Patentansprüchen 1 und 2 ist in
Claims (3)
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DE102012023124.5A DE102012023124B4 (en) | 2012-11-27 | 2012-11-27 | Method and device for visualizing interventional instruments in magnetic resonance imaging via sequence-triggered energization with evaluation of the magnitude and phase images |
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DE102012023124.5A DE102012023124B4 (en) | 2012-11-27 | 2012-11-27 | Method and device for visualizing interventional instruments in magnetic resonance imaging via sequence-triggered energization with evaluation of the magnitude and phase images |
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DE102015012201A1 (en) | 2015-09-18 | 2017-03-23 | Hansjörg Graf | Method and device for visualizing interventional instruments in magnetic resonance imaging (MRI) via discrete phase coding artifacts generated by means of sequence-triggered energization |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US4572198A (en) * | 1984-06-18 | 1986-02-25 | Varian Associates, Inc. | Catheter for use with NMR imaging systems |
US5951472A (en) * | 1996-11-04 | 1999-09-14 | U.S. Philips Corporation | MR system and invasive device for interventional procedures |
DE19958408A1 (en) * | 1999-12-02 | 2001-06-07 | Philips Corp Intellectual Pty | Magnetic resonance arrangement with devices to localize or visualize instrument inserted in patient; has magnet device controlled and positioned by control unit, to vary position in MRI datasets |
DE69634035T2 (en) * | 1995-11-24 | 2005-12-08 | Koninklijke Philips Electronics N.V. | SYSTEM FOR IMAGING BY MAGNETIC RESONANCE AND CATHETER FOR PROCEDURE PROCEDURE |
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- 2012-11-27 DE DE102012023124.5A patent/DE102012023124B4/en not_active Withdrawn - After Issue
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4572198A (en) * | 1984-06-18 | 1986-02-25 | Varian Associates, Inc. | Catheter for use with NMR imaging systems |
DE69634035T2 (en) * | 1995-11-24 | 2005-12-08 | Koninklijke Philips Electronics N.V. | SYSTEM FOR IMAGING BY MAGNETIC RESONANCE AND CATHETER FOR PROCEDURE PROCEDURE |
US5951472A (en) * | 1996-11-04 | 1999-09-14 | U.S. Philips Corporation | MR system and invasive device for interventional procedures |
DE19958408A1 (en) * | 1999-12-02 | 2001-06-07 | Philips Corp Intellectual Pty | Magnetic resonance arrangement with devices to localize or visualize instrument inserted in patient; has magnet device controlled and positioned by control unit, to vary position in MRI datasets |
Non-Patent Citations (3)
Title |
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GLOWINSKI, A. [et al.]: A Perspective on Needle Artifacts in MRI: An Electromagnetic Model For Experimentally Separating Susceptibility Effects. In: IEEE TRANSACTIONS ON MEDICAL IMAGING, Bd. 19, Nr. 12, Dez. 2000, S. 1248-1252. * |
GLOWINSKI, A. [et al.]: Device Visualization for Interventional MRI Using Local Magnetic Fields: Basic Theory and Its Application to Catheter Visualization. In: IEEE TRANSACTIONS ON MEDICAL IMAGING, Bd. 17, Nr. 5, Okt. 1998, S. 786-793. * |
JOY, M. [et al.]: IN VIVO DETECTION OF APPLIED ELECTRIC CURRENTS BY MAGNETIC RESONANCE IMAGING. In: Magnetic Resonance Imaging., 1989, Bd. 7, S. 89-94. * |
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