Patent ID: 8428218

Claim:
A dynamic tumor radiation treatment apparatus, comprising: gamma ray detecting means for detecting an annihilation gamma ray emitted from a radiopharmaceutical that accumulates in a tumor by dosing in vivo; displacement threshold storage means for storing a threshold of counting rate according to a relationship between said counting rate of the annihilation gamma ray and a displacement of a radiation source; gamma ray counting rate computing means for computing the counting rate according to a detection signal of the annihilation gamma ray detected by said gamma ray detecting means; threshold comparing means for comparing the counting rate of annihilation gamma rays acquired from said gamma ray counting rate computing means with the threshold of the counting rate acquired from said displacement threshold storage means; tumor position judging means for judging whether or not the tumor is displaced out of a radiation irradiation spot according to results by said threshold comparing means; and irradiation control means for making a control to stop radiation irradiation by a therapeutic radiation irradiation means when said tumor position judging means judges that the tumor is displaced out of the radiation irradiation spot or for outputting a stop command signal.