NDLI: An efficient detector production method for position-sensitive scintillation detector arrays with 98% detector packing fraction

Content Provider	IEEE Xplore Digital Library
Author	Uribe, J. Wai-Hoi Wong Baghaei, H. Farrel, R. Li, H. Liu, Y. Wang, Y. Xing, T.
Copyright Year	2003
Description	Author affiliation: M.D. Anderson Cancer Center, Texas Univ., Houston, TX, USA (Uribe, J.; Wai-Hoi Wong; Baghaei, H.; Farrel, R.; Li, H.; Liu, Y.; Wang, Y.; Xing, T.)
Abstract	Position-sensitive scintillation-detector arrays (PSSDA) are used in nuclear imaging such as PET. The PSSDA-production method determines the imaging resolution, sensitivity, labor/part cost, and reliability of the system. It is especially challenging and costly for ultra high-resolution systems that have large numbers of very small crystal-needles. A new slab-sandwich-slice (SSS) production method was developed. Instead of using individual crystal needles, the construction started with crystal slabs that are 15-crystal-needles wide and 1-needle thick. White-paint was deposited onto slab surfaces to form shaped optical windows. The painted slabs were grouped into two crystal-sandwich types. Each sandwich-type was a stack of 7 slabs painted with a distinctive set of optical windows, held together with optical glue. For a 40,000-crystal system, only 192 type-A and 144 type-B sandwiches are needed. Sandwiches were crosscut into another slab formation ("slices"). Each slice was again 1-needle thick; each slice is basically a stack of needles glued together, optically coupled by the glue and the painted windows. After a second set of white-paint optical-windows was applied on the slices' surface, 3 slices of type-B are grouped between 4 slices of type-A forming a 7/spl times/7 PSSDA. The SSS production method was applied in the construction of high-resolution 12-module prototype PET camera (HOTPET). The method reduces the more than 400,000 precision painting and gluing steps into 55,000 steps for a 40,000-BGO-crystal system, leading to lower labor cost. Detectors were fabricated with the method with good results. 2.66/spl times/2.66 mm/sup 2/ crystals are separated only by a 0.06-mm gap; this is a 98% linear detector packing fraction or 96% area packing fraction. Compared to 90% linear-packing (81% area) from conventional methods, the 20% higher crystal-packing density would translate into a 1.2-1.44 times higher coincidence-detection sensitivity in PET. The SSS method cut the crystal cost by half, and improved production yield by 94%. Crystal-positioning error was /spl sigma/=0.09mm.
Starting Page	1144
Ending Page	1148
File Size	2000596
Page Count	5
File Format	PDF
ISBN	0780376366
DOI	10.1109/NSSMIC.2002.1239524
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	Position sensitive particle detectors Solid scintillation detectors Production Scintillation counters Sensor arrays Slabs Optical sensors Positron emission tomography Costs Needles
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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