DETECTED VALUE CALIBRATION METHOD, X-RAY CT SYSTEM, PHANTOM FOR CALIBRATION AND HOLDER

摘要

PROBLEM TO BE SOLVED: To provide an effective detected value calibration method which enables the acquisition of an image of a specimen with a moderate contrast by carrying out an effective calibration and an X-ray CT system, a phantom for calibration and a holder used for it.

SOLUTION: The detected value calibration method for the calibration of detected values in an X-ray CT radiography comprises the step of fixing the phantom 1 for calibration filled with a liquid on the X-ray CT system to carry out an X-ray CT radiography for calibration, the step of putting the specimen 30 into the liquid of the phantom 1 for calibration to fix the phantom for calibration with the specimen 30 in it on the X ray CT system to carry out the X-ray CT radiography of the specimen 30 and a step of calibrating the detected values by the X-ray CT radiography of the specimen using the detected values by the X-ray CT radiography for calibration. The photographing is made with the tube voltage of X rays lowered to carry out the calibration, thereby achieving a higher contrast of CT data.

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