NDLI: Investigation of scintillation light multiplexing for PET detectors based on position sensitive avalanche photodiodes

Content Provider	IEEE Xplore Digital Library
Author	Habte, F. Olcott, P.D. Levin, C.S. Foudray, A.M.K.
Copyright Year	2005
Description	Author affiliation: Dept. of Radiol., Stanford Univ., CA, USA (Habte, F.; Olcott, P.D.; Levin, C.S.; Foudray, A.M.K.)
Abstract	Dedicated high resolution compact PET systems are being developed for breast and small animal imaging that use lutetium oxyorthosilicate (LSO) crystals (1/spl times/1/spl times/3 mm/sup 3/) coupled to highly compact position sensitive avalanche photodiodes (PSAPDs) with 8/spl times/8 mm active area and 200 /spl mu/m thickness. The full system will consist of thousands of PSAPDs. In this paper, we investigated methods to multiplex scintillation light from the LSO crystals in order to significantly reduce the number of PSAPDs required without compromising the system performance. Initial experiments were performed using dual-layer slotted LSO crystals forming crystal pixels that are offset with respect to either layer by half crystal pixel width in either 1D or 2D configuration. For the 1D crystal configuration, the results show that all crystal pixels (1/spl times/1/spl times/3 mm/sup 3/ ) except the edge crystal pixels can be resolved with an average of 3:1 peak-to-valley ratio when a specular reflector is used between the crystal slots. An average energy resolution of (/spl sim/13%) is also obtained. Compared to the 1D offset crystal configuration, the 2D offset crystal configuration showed slightly better performance with an average energy resolution of (/spl sim/12%) and peak-to-valley ratio of (/spl sim/4.5:1). This result is comparable to the previous published data using discrete single layer crystal arrays. A relatively uniform photo peak energy distribution (standard deviation /spl sigma/ < 0.3 volts) is also observed. The result showed that light multiplexing using dual layer LSO crystals with offset crystal slot configuration has great potential. In addition, the slot crystal offset mechanism will simplify the mechanical assembly of the crystals.
Starting Page	4
Ending Page	2030
File Size	1561161
Page Count	2027
File Format	PDF
ISBN	0780392213
ISSN	10957863
DOI	10.1109/NSSMIC.2005.1596731
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-23
Publisher Place	Puerto Rico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Positron emission tomography Position sensitive particle detectors Solid scintillation detectors Avalanche photodiodes Crystals Energy resolution Image resolution Breast Animals High-resolution imaging
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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