NDLI: Signal characteristics of individual crystals in a high resolution BGO detector design using PMT-quadrant sharing

Content Provider	IEEE Xplore Digital Library
Author	Uribe, J. Hongdi Li Yaqiang Liu Tao Xing Baghaei, H. Yu Wang Farrell, R. Wai-Hoi Wong
Copyright Year	2003
Description	Author affiliation: M.D. Anderson Cancer Center, Texas Univ., Houston, TX, USA (Uribe, J.; Hongdi Li; Yaqiang Liu; Tao Xing; Baghaei, H.; Yu Wang; Farrell, R.; Wai-Hoi Wong)
Abstract	The PMT-quadrant sharing (PQS) detector design allows very high resolution detectors to be achieved with 70% fewer PMT and cost. A common concern for the design is that there is a big gap (photo-insensitive area) between 4 circular PMT, and the photoelectron signal (pulse height) may be much lower for the central crystals. The pulse heights and energy resolution for each crystal in 3 different types of PQS blocks for 19 mm PMT have been measured. For a regular square 7 /spl times/ 7 block (2.66 /spl times/ 2.66 /spl times/ 18 mm BGO): the maximum photopeak signals occurred at the corner crystal of the block. The signals for the worst central-5 crystals (sitting on space with no PMT connection) was found to have pulse heights of 0.87 that of the corner crystals. The 12 crystals (outside the central-5) coupling only to the glass wall but not the photocathode had a relative pulse height of 0.92. The 8 crystals with partial exposure to photocathodes had 0.94. The energy resolution for individual crystal was found to be 22-30% with an average of 26%. Asymmetric photopeaks, especially for the corner crystals, were observed, which was found to be from the depth-of-interaction effect. In the latest PQS design, extended blocks with asymmetric light distributions were used on the 4 edges and 4 corners of a large detector module so that the previously unused (wasted) half-row of peripheral PMT are now covered by crystals. An asymmetric blocks, single-extended (7 /spl times/ 8 blocks) was also tested. The pulse-height ratio between the worst and best group of crystals in the single-extended block was found to be 0.72 and that of the double extended block was also found to be 0.72. In a more demanding, higher spatial resolution 8 /spl times/ 8 array (2.3 /spl times/ 2.3 /spl times/ 10 mm BGO) for mouse PET with shallower crystals, the pulse-height ratio was 0.73 with an average energy resolution of 20%. This study demonstrated that pulse height uniformity for the PQS design using circular PMT was excellent, which is better than the typical 4/1 pulse-height ratio in conventional block detectors.
Starting Page	926
Ending Page	930
File Size	703018
Page Count	5
File Format	PDF
ISBN	0780376366
DOI	10.1109/NSSMIC.2002.1239475
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-11-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Crystals Signal resolution Detectors Signal design Energy resolution Pulse measurements Cathodes Costs Energy measurement Glass
Content Type	Text
Resource Type	Article

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