NDLI: Improvement of dead time and decoding resolution for position-sensitive detectors using a fully dynamic approach of light collection

Content Provider	IEEE Xplore Digital Library
Author	Hongdi Li Chao Wang Shaohui An Baghaei, H. Yuxuan Zhang Shitao Liu Ramirez, R. Wai-Hoi Wong
Copyright Year	2010
Description	Author affiliation: Department of Experimental Diagnostic Imaging, University of Texas, M.D. Anderson Cancer Center, Houston, TX 77030 USA (Hongdi Li; Chao Wang; Shaohui An; Baghaei, H.; Yuxuan Zhang; Shitao Liu; Ramirez, R.; Wai-Hoi Wong)
Abstract	Photo-sensor sharing (multiple blocks or crystals) can achieve high-resolution position-sensitive detectors but it also increases the dead time and pileups for scintillation event detection. Several methods such as pulse-clipping and HYPER (high-yield-pileup-event-recovery) have been introduced to minimize the dead time and pileups with a trade-off of less scintillation light collection. However, collecting smaller number photoelectrons would increase the statistical error, which in a turn will decrease the decoding resolution. In this study, instead of applying the HYPER method to 3 Anger-signal (X, Y and E) simultaneously, we use an individual dynamic approach for each photo-sensor to maximize the scintillation light collection while it still has a capability of rejecting pileups. The photo-electron collection for one photo-sensor involving a current event decoding will not be disturbed until a new event is detected that also requires this photo-sensor for position-decoding. If a new event comes from an adjacent detector block only sharing one photo-sensor currently involving the previous event decoding, it may only disturb the light collection of this sharing photo-senor; hence only one photo-sensor creates a poor statistical error and the rest photo-sensors can still collect a large number of photo electrons with good statistics for the previous event to achieve a good decoding resolution. This paper compares the decoding results using pulse clipping and this new proposed fully dynamic approach at various count-rates for a regular position-sensitive block detector and a PMT-quadrant-sharing (PQS) block detector. To study the decoding resolution at various high count-rates, a pulse waveform library was built by recording a large number of pulses by a digital oscilloscope from a detector test-bench at a low count-rate first and then boost to different high count-rates by software generated Poisson event time sequence. The result shows this fully dynamic approach reduces the dead space of PQS detectors by x2.25 without increasing the statistical noise.
Starting Page	3133
Ending Page	3136
File Size	153767
Page Count	4
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874378
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	Decoding Detectors Noise Photonics Positron emission tomography Libraries
Content Type	Text
Resource Type	Article

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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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