Positron Camera System for Heavy-ion Radiotherapy at Himac
نویسندگان
چکیده
The positron camera system was designed and developed at the secondary beam course of HIMAC to measure heavy-ion ranges in bodies of patients. By using the pencil-like beam of positron emitters, such as C, the range is checked directly and precisely by detecting pairs of annihilation gamma rays emitted from the stopping point of the beam. The positron camera consists of a pair of Anger-type scintillation cameras. In order to achieve high detection efficiency, each detector is equipped with a large NaI(Tl) crystal having a thickness of 30 mm and a diameter of 600 mm. The test results reveal that the range can be measured with accuracy of less than 1 mm under the limitation that the irradiation dose has to be less than a few percent of the therapeutic one.
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