NDLI: A study of transit time variation in the PMT with a gain programmable voltage divider for a TOF PET

Content Provider	IEEE Xplore Digital Library
Author	Chao Wang Hongdi Li Shaohui An Yuxuan Zhang Baghaei, H. Ramirez, R.A. Shitao Liu Wai-Hoi Wong
Copyright Year	2010
Abstract	In the front-end circuit of a Positron Emission Tomography (PET) camera, adjusting the photomultipliers (PMT) gain by changing the voltage distribution in dynodes instead of changing the total high voltage is more convenient to realize, and this method is better in signal-to-noise-ratio (SNR) than using a variable-gain-amplifier (VGA) in the signal path which may induce extra noise. In this study, we revised the previous voltage divider design to achieve wider gain adjustable range which relaxes the PMT gain-spread requirement to reduce the PMT cost. An accurate test bench was used to measure the PMT transit time variation as a function of the relative gain. From the test result, within the adjustable gain range, the PMT transit time variation can be as large as several hundreds of picoseconds; and this is non-ignorable in the Time-of-Flight (TOF) applications. Hence, a time correction is required. A look-up-table (LUT) from the transit time variation vs. PMT relative gain curve is used to correct this transit time variation with the gain adjustment simultaneously without performing the time-consuming entire system timing recalibration.
Starting Page	2155
Ending Page	2157
File Size	748351
Page Count	3
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874162
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	Timing Voltage control Crystals Positron emission tomography Signal to noise ratio Resistors Time of Flight (TOF) Positron Emission Tomography (PET) PMT divider
Content Type	Text
Resource Type	Article

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