CONCEALMENT-TYPE RADIOTHERAPY/IMAGING COMBINED DEVICE

摘要

A structure (referred to as a shield) to block nuclear fragments is operated in accordance with the on/off state of the irradiation of a beam. During the irradiation of a beam, the amount of nuclear fragments entering a detector is reduced. Therefore, annihilation radiation is measured immediately after radiation or during radiation, and a three-dimensional image of a radiation field is generated.