Patent ID: 6173033
Filing Date: 2001-01-09
Classification: A61B,G21K

Abstract:
An X-ray computed tomography apparatus comprising:an X-ray source which emits an X-ray beam;a radiation detector comprising a plurality of detector rows, said detector being disposed so that said X-ray beam is at least partially incident thereon;a first slot diaphragm disposed proximate said X-ray source in a path of said X-ray beam;a second slot diaphragm disposed proximate said radiation detector in said path of said X-ray beam;means for rotating said X-ray source around an examination subject for obtaining tomographic data;a computer connected respectively to said detector rows by a plurality of lines, supplied with said tomographic data, for producing a computed tomogram from said tomographic data;means for temporarily maintaining said X-ray source and said detector in a non-rotating position;a movable patient table adapted to receive an examination subject thereon;means for producing relative non-rotational motion between said table and said X-ray source and said radiation detector when said X-ray source and said radiation detector are maintained in said non-rotating position;means, during said relative motion, for individually adjusting said first and second slot diaphragms for causing said X-ray beam to be incident on a selected number of said rows of said detector to produce shadowgraphic data; andsaid shadowgraphic data from said detector rows being supplied separately and individually to said computer via said plurality of lines, and said computer comprising means for producing a shadowgraph from said shadowgraphic data from a selected number of said detector rows.