Patent ID: 6445761
Filing Date: 2002-09-03
Classification: A61B

Abstract:
An X-ray CT apparatus, comprising:a display apparatus displaying a tomographic image; means for setting a concerned region on the tomographic image displayed by said display apparatus; X-ray shielding means for restricting an irradiation range of an X-ray fan beam in relation to said concerned region; means for controlling said X-ray shielding means so that said irradiation range of said X-ray fan beam through said X-ray shielding means and restriction positions of said X-ray shielding means are controlled in response to a rotation angle of an X-ray irradiator; means for, through said X-ray shielding means, irradiating with X-rays from said X-ray irradiator a range including said concerned region in a subject to be inspected and executing an X-ray CT measurement; and means for obtaining outside of concerned region data by means of calculation and reconstructing an image with the use of said outside of concerned region data and data of the irradiation range restricted by said X-ray shielding means, said outside of concerned region data being data of a range that is not restricted by said X-ray shielding means.