X-RAY CT DEVICE, CALCULATION DEVICE, RECORDING MEDIUM FOR X-RAY CT DEVICE, AND MAINTENANCE METHOD FOR X-RAY CT DEVICE

摘要

An X-ray CT device prevents deterioration in quantitative characteristics of CT values caused by an X-ray beam hardening (BH) effect. An X-ray absorption characteristic (S) found by simulation beforehand and a target value (T) therefor are saved, the simulation value (S) is modified using projection data measured using maintenance measurement for obtaining basic data required for BH correction, and a BH correction coefficient is calculated using the X-ray absorption characteristic (S) after modification and the target value (T). BH accuracy can be improved with few actual measurement values, misdiagnosis caused by non-uniformity of CT values can be reduced, and improvement of diagnostic performance in line with improvement of the quantitative characteristics of CT values can be achieved.