Patent ID: 9691166
Date: 2017-06-27
CPC Classifications: A61B,G01N,G01T,G06T

Claim:
1. A radiation CT apparatus, comprising: a rotational table on which an object to be examined is placed, a radiation source, and a radiation detector, the rotational table being provided between the radiation source and the radiation detector, which are provided so as to face each other, and so as to rotate around a rotation axis that is perpendicular to the direction of the radiation axis; and a reconstruction arithmetic operation means configured to construct a tomogram of the object along a sliced surface that is perpendicular to said rotation axis through a first reconstruction arithmetic operation using data of the projected object with radiation collected by taking in the output of said radiation detector for each of the minute rotational angles gained when the rotational table is rotated while irradiating the object on the rotational table with radiation from said radiation source, wherein said reconstruction arithmetic operation means comprises: (1) a screen display for changing the rotation axis coordinates that constructs a tomogram along a predetermined sliced surface using temporary coordinates that have been set in advance as the coordinates of said rotation axis projected over said radiation detector in the first reconstruction arithmetic operation after collecting data on said object projected with radiation, and at the same time displays a screen for changing the coordinates of the projected rotation axis that include said tomogram and the temporary coordinates; and (2) an instruction input means for instructing said reconstruction arithmetic operation means to perform a second reconstruction arithmetic operation by shifting the coordinates of the projected rotation axis by any amount in any direction relative to said temporary coordinates through an operation on the screen, wherein said reconstruction arithmetic operation means is configured to carry out the second reconstruction arithmetic operation by changing the coordinates of the projected rotation axis in accordance with the instructions, and said screen display means for changing the rotation axis coordinates allows three tomograms in total to be displayed on a display in such a state as to be aligned with the center one constructed through a reconstruction arithmetic operation using said temporary coordinates, and the remaining two respectively constructed through a reconstruction arithmetic operation respectively using two projection coordinates that shift from the temporary coordinates to the two sides by a predetermined amount with the temporary coordinates in between.