X-ray CT device

摘要

A view image of high time resolution acquired in an imaging process of X-ray CT is displayed. In this display, by subtracting a background image obtained by forward projection calculation of a CT image from the view image, background is removed from the view image, and only a focused site is imaged. A transmission image of the focused site showing high display contrast and not easily influenced by a motion artifact can be thereby obtained. Thereby, in an X-ray CT device for diagnostic imaging, degradation of diagnostic ability due to motion artifacts can be prevented.

主权项

1. An X-ray CT device comprising an X-ray generating part, an X-ray detecting part oppositely disposed to the X-ray generating part, a revolving mechanism part for revolving a pair of the X-ray generating part and the X-ray detecting part, an image processing part for creating a CT image of a subject on the basis of X-ray transmission images of the subject acquired at a plurality of positions along the circumferential direction of the revolution, and a display part for displaying the CT image, wherein:
the image processing part comprises: a region-of-interest setting part which sets a region of interest in the CT image, a data value converting part which converts a data value of the CT image in the region of interest to another value, a forward projection part which performs forward projection of the CT image including the CT image of the ROI, in which the data value is converted, and the CT image of a region outside the ROI, from a virtual X-ray generating part to a virtual X-ray detecting part to calculate a pseudo X-ray transmission image, and a difference calculating part which calculates difference between the X-ray transmission image and the pseudo X-ray transmission image to create a differential image.