A positron-decay triggered transmission source for positron emission tomography

被引:5
作者
Camborde, ML [1 ]
Thompson, CJ
Togane, D
Zhang, N
Reader, A
机构
[1] UVC, Triumf Pet Grp, Brain Res Ctr, Vancouver, BC V6T 2B5, Canada
[2] McGill Univ, Med Phys Unit, Montreal, PQ H3G 1A4, Canada
[3] Montreal Neurol Inst, Montreal, PQ H3A 2B4, Canada
[4] Clarke Inst Psychiat, Toronto, ON M5T 1R8, Canada
[5] CPS Innovat Inc, Rockford, TN USA
[6] Univ Manchester, Inst Sci & Technol, Manchester M60 1QD, Lancs, England
基金
加拿大健康研究院; 加拿大自然科学与工程研究理事会;
关键词
attenuation correction; plastic scintillator; positron decay; positron emission tomography (PET);
D O I
10.1109/TNS.2003.823019
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Attenuation of gamma rays is the most important correction required to provide artefact-free quantitative images in positron emission tomography (PET). We have tested a new technique, which allows multiple sources to be used for transmission scans. Each point source is surrounded by plastic scintillator, and the energy the positron must lose before annihilation is collected in the plastic scintillator coupled to a miniature photo-multiplier tube (PMT). The fast trigger from the PMT signals that positron decay has occurred, and arms a circuit to anticipate the arrival of one of the annihilation gamma rays in one of the scanner's conventional detectors. When this occurs, a line of response joining the current source position and detector position is identified. This technique has been tested using four Ge-68 sources imbedded in 5 mm diameter plastic cylinders coupled to miniature PMTs on the "ANIPET" small animal PET scanner at the Montreal Neurological Institute. Cross-talk (one plastic scintillator recording a gamma ray from any adjacent source instead of a positron from its own source) was 0.5%, and the count rate in one channel was 198 kcps implying a positron detection efficiency of 44%. Finally, preliminary images were obtained of the feasibility of using positron-decay as a transmission source.
引用
收藏
页码:53 / 57
页数:5
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