RADIOTHERAPEUTIC DOSE DISTRIBUTION MEASURING APPARATUS AND RADIOTHERAPEUTIC DOSE DISTRIBUTION MEASURING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a radiotherapeutic dose distribution measuring apparatus or the like capable of preventing excessive irradiation to an affected area and excessive irradiation to a normal tissue by measuring an actually irradiated region in the patient and actual dose and providing the result in a predetermined form in external X-ray radiation therapy.;SOLUTION: A detector having a collimator in a position at a specific angle with respect to a therapeutic X-ray beam is mounted to selectively detect only scattering radiation in the direction. Since angles and amounts of X-rays scattered by Compton scattering are known theoretically, if scattering radiation at a certain angle can be detected, the number of scattering radiation at other angles can be also estimated. Further, to three-dimensionally obtain a distribution of places where scattering occurs in a patient body, the detector is rotated during irradiation and scattering radiation is measured from all directions. After that, a reconstructing process is performed, and a distribution of occurrence of scattering radiation in the subject is three-dimensionally imaged.;COPYRIGHT: (C)2009,JPO&INPIT