| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an X-ray CT system with which calibration data required for reconstituting an image can be surely possessed in ordinary state corresponding to the focal shift of an X-ray tube. SOLUTION: X-rays from an X-ray tube 3 are narrowed into X-ray flux 9 by a collimator 2, masked in slice direction by a collimator 5 and made incident to an arcuate detector 6. At both the ends of that detector 6, FMS reference channels 7 are provided for detecting the focal shift of the X-ray tube 3 and a computer 14 is provided for possessing the calibration data of a phantom 8 for calibration corresponding to the signals of these FMS reference channels 7 in the ordinary state at good timing. The actually possessed data are corrected by these data and the image is reconstituted so that a beautiful image with no imaginery picture can be observed.</p> |
