NDLI: Comparison of two light reflector patterns designed for PMT-Quadrant-Sharing (PQS) Time-of-Flight PET detectors

Content Provider	IEEE Xplore Digital Library
Author	An, S. Li, H. Ramirez, R. Liu, S. Zhang, Y. Wang, C. Baghaei, H. Wong, W.
Copyright Year	2010
Description	Author affiliation: Department of Experimental Diagnostic Imaging, University of Texas M. D. Anderson Cancer Center, Houston, TX 77030 U.S.A. (An, S.; Li, H.; Ramirez, R.; Liu, S.; Zhang, Y.; Wang, C.; Baghaei, H.; Wong, W.)
Abstract	In this paper we compared both the timing resolution and the 2-dimension (2D) decoding map of two different reflector patterns of PMT-Quadrant-Sharing (PQS) block to obtain an optimized detector design for Time-of-Flight (TOF) PET application. Light reflectors (ESR mirror film from 3M Co.) in a PQS scintillation crystal block control the light-sharing ratio and light spread angle to the PMTs that determine the quality of the 2D decoding map. The objective of this study is to investigate the timing affected by reflector length. We built two 13×13 LYSO PQS blocks (4×4×20 $mm^{3})$ with different reflector patterns (mask #1 and #2). Mask #1 is a decoding-optimized reflector pattern developed by our lab. Mask #2 is 2 mm in average shorter than the mask #1. A 4×4×20 $mm^{3}$ monolithic LYSO coupled to fast Hamamatsu PMT R9779 was used as a reference for the timing measurement which had a resolution of 214 ps (FHWM). Signals from PMTs were captured by oscilloscope and analyzed with Labview. Linear fitting and extrapolation to the baseline of the pulse rising edge was used to get the pulse arrival time. The result shows the block with shorter mask #2 provided an improvement of 6.2% in timing resolution and 5.1% higher in energy than that with longer mask #1 for the crystals in the block center with a trade-off of 8% shrinking in 2D decoding map, which decreases the average peak-valley ratio from 3.3 to 3.0.
Starting Page	3130
Ending Page	3132
File Size	938186
Page Count	3
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874377
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Crystals Timing Decoding Energy resolution Detectors Positron emission tomography Films time-of-flight PET coincidence timing resolution PQS LYSO block reflector
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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