NDLI: Performance evaluation of a transformable axial-shift type single-ring OpenPET

Content Provider	IEEE Xplore Digital Library
Author	Yoshida, E. Shinaji, T. Tashima, H. Haneishi, H. Yamaya, T.
Copyright Year	2013
Description	Author affiliation: Grad. Sch. of Eng., Chiba Univ., Chiba, Japan (Shinaji, T.) \|\| Center for Frontier Med. Eng., Chiba Univ., Chiba, Japan (Haneishi, H.) \|\| Nat. Inst. of Radiol. Sci., Chiba, Japan (Yoshida, E.; Tashima, H.; Yamaya, T.)
Abstract	One of the challenging applications of PET is implementing it for in-beam PET, which is an in situ monitoring method for charged particle therapy. For this purpose, we have previously proposed two geometries for our open-type PET scanners named OpenPET. The original OpenPET had a physically opened field-of-view (FOV) between two detector rings through which irradiation beams pass. This dual-ring OpenPET (DROP) had a wide axial FOV including the gap. But, this geometry is not necessarily the most efficient for application to in-beam PET in which only a limited FOV around the irradiation field is required. Therefore, we proposed a single-ring OpenPET (SROP) geometry which can provide an accessible and observable open space with higher sensitivity and a reduced number of detectors compared to DROP. Also, we proposed two arrangement types, a slanted ellipse (SE) type where oval detector rings are slanted and stacked and an axial shift (AS) type where block detectors originally forming a conventional PET scanner are axially shifted little by little. Previously, we developed the SE-SROP prototype, and showed its good performance for in-beam PET. However, the SE-SROP decreased sensitivity slightly relative to the ring-type PET and needed a large gantry in the axial direction for conventional PET studies. On the other hand, AS-SROP can transform conventional ring-type PET scanners into stacked detectors with a gradual axial shift. In this work, we developed and evaluated a small AS-SROP prototype for proof-of-concept. The AS-SROP prototype was designed with 2 cylinder-shaped detector rings of 16 DOI detectors. The system sensitivity and spatial resolution were measured and were 5.1% and 2.6 mm, respectively, for the OpenPET mode. For the conventional PET mode, the system sensitivity and spatial resolution were 7.3% and 2.2 mm, respectively. We concluded that the AS-SROP geometry has a good potential for not only in-beam imaging but also conventional PET studies.
Starting Page	1
Ending Page	3
File Size	200410
Page Count	3
File Format	PDF
e-ISBN	9781479905348
DOI	10.1109/NSSMIC.2013.6829110
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-10-27
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Positron emission tomography Detectors Prototypes Sensitivity Spatial resolution Geometry
Content Type	Text
Resource Type	Article

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