@misc{oai:repo.qst.go.jp:00070602,
 author = {Kinouchi, Shoko and Yamaya, Taiga and Tashima, Hideaki and Yoshida, Eiji and Nishikido, Fumihiko and Haneishi, Hideaki and Suga, Mikio and 木内 尚子 and 山谷 泰賀 and 田島 英朗 and 吉田 英治 and 錦戸 文彦 and 羽石 秀昭 and 菅 幹生},
 month = {Oct},
 note = {One of the challenging applications of PET is for in-beam PET, which is an in situ monitoring method for charged particle therapy. For this purpose, we have previously proposed an open-type PET scanner, OpenPET. The original OpenPET has a physically opened field-of-view (FOV) between two detector rings which irradiation beams pass through. This dual-ring OpenPET has a wide axial FOV including the gap. Therefore this geometry is not necessarily efficient when it is applied to in-beam PET in which only a limited FOV around the irradiation field is required. In this paper, we proposed a new single-ring OpenPET geometry as more efficient geometry dedicated to in-beam PET. The detector ring of the proposed geometry is a cylinder both ends of which are cut by parallel aslant planes. The proposed geometry can be made compact so that the beam port can be placed close to the patient.
One of the problems for the proposed geometry is arranging the rectangular block detectors. We proposed two arrangement types, a slanted ellipse type where oval detector rings are slanted and stacked and an axial shift type where block detectors originally forming a conventional PET scanner are axially shifted little by little. We compared the two types through numerical simulations. The simulated system was a small prototype that we designed for a proof-of-concept. The system was designed with 2 detector rings of 16 block detectors. We supposed the detector had 4-layer depth-of-iteration capability.
In the simulations, both types resulted in acceptable image quality. The simulated system was a small one, where the size of the block detectors was relatively large. Therefore quality of reconstructed images was slightly degraded for the axial shift type, because the edge of the detector ring had a notched structure. Our next plan is the simulation design of the human-sized geometry for the single-ring OpenPET., IEEE 2011 NSS MIC RTSD},
 title = {Simulation Design of a Single-Ring OpenPET for In-Beam PET},
 year = {2011}
}