An X-ray CT scanner comprises an X-ray source generating an X-ray, detector detecting the X-ray transmitted through an object, processor to produce projection data, and reconstruction unit to reconstruct an image using the projection data. The processor produces the projection image by applying, to an...http://www.google.com.au/patents/US6829324?utm_source=gb-gplus-sharePatent US6829324 - X-ray CT scanner capable of performing improved log conversion