Patent ID: 9173619
Filing Date: 2015-11-03
Classification: A61B,G21K

Abstract:
1. An X-ray CT apparatus, comprising: an X-ray source; a wedge which is disposed between the X-ray source and a subject and in which a shield blocking a part of an X ray is formed; a wedge driving unit configured to move a position of the wedge in a slice thickness direction; and a system control unit configured to control the wedge driving unit during a scan execution period to control the position of the wedge, wherein the system control unit is configured to one of (1) control the wedge to a first position where first X-rays, which spread in a slice thickness direction of the X-ray source, unnecessary for reconstruction of an image for medical use are blocked in a non-reconstruction range at a start of the scan execution period, and (2) control the wedge to move to a second position where second X-rays unnecessary for reconstruction of the image for medical use are blocked in a non-reconstruction range at an end of the scan, and control the wedge to move to a third position so as not to block third X-rays in a reconstruction range of the image for medical use.