@misc{oai:repo.qst.go.jp:00060463,
 author = {Urakabe, Eriko and et.al and 新谷 恵理子},
 month = {Jun},
 note = {A scheme for offline PET measurement of 11C beam irradiation field has been developed in order to verify a three-dimensionally conformal irradiation field for particle radiotherapy. With use of positron emitter beams such as 11C, the verification of therapeutic irradiation can be directly accomplished by observing annihilation-pair gamma rays from the stopping point in the patient. One of the features of 11C therapeutic beam is the large number of the annihilation gamma ray observed at the range of the incident beam. The half-life of 11C is 20.39 min, which is appropriate for measurements using offline positron emission tomography (PET).
The experiment to simulate the treatment irradiation and offline PET verification was accomplished with PMMA phantom. The concave-shaped irradiation field was optimised with 1 Gy in uniform phantom. The dose distribution of the concave field is confirmed with multi-channel ionization chamber and the water column in advance. To reduce the set up error at the PET gantry, the platform on the couch of PET is prepared and the reference position of the platform is fixed using the 22Na point source. After the irradiation with 11C (345 MeV/n) by HIMAC scanning system, the phantom is set on the platform in the PET gantry and measured for an hour. 
In this conference, the results of the PET verification of 11C irradiation field will be presented., 40th　PTCOG},
 title = {Verification of 11C scanning irradiation with offline PET},
 year = {2004}
}