| 摘要 |
<p>PURPOSE:To relieve a positioning burden for calibration on a body to be tested the centers of the testing portions of which are changed from each other by providing a plurality of cylinder body parts joined together in a state that central axes are positioned eccentrically to each other. CONSTITUTION:In an X-ray CT, a phantom 17 is used to perform calibration of a detector 9. The phantom 17 comprises a phantom part 17a for a head and a phantom 17b for a trunk, and the phantoms are joined together such that central axes O1 and O2 of the phantoms are positioned eccentrically to each other. A mounting device 19 is mounted on the one end surface of the phantom 17, the mounting device 19 is mounted to a mounting jig 15, and the phantom 17 is disposed to a top plate 11. Through slide of the top plate 11, the phantom 17 is disposed in a photographing space 5, and reference data on the head part of a body P to be tested and the trunk part of the body P to be tested is obtained by the phantom part 17a for a head and the phantom part 17b for a trunk. Since there is no need to vertically move the top plate 11 and effect tilt operation of a frame 1, a scan time is shortened and the burden of an operator is relieved.</p> |
