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Evaluation of multi-channel PMT's for readout of scintillator arrays [PET application]

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5 Author(s)
Yiping Shao ; Sch. of Med., California Univ., Los Angeles, CA, USA ; Cherry, S.R. ; Siegel, S. ; Silverman, R.W.
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The authors have evaluated two Philips multi-channel photomultiplier tubes (MC-PMT's) for use as position sensitive photon detectors for reading out scintillator arrays. They are interested in the use of such a detector for medical imaging applications with relatively low light output scintillators such as bismuth germanate (BGO). The 64 pixel XP1702 model MC-PMT has a standard glass entrance window whereas the XP1722 has a fiber-optic entrance window designed to reduce crosstalk. Scintillator arrays are typically coupled to the PMT's using fiber-optics. In this evaluation, parameters such as inter-channel gain variation, crosstalk, photoelectron spectrum and linearity were measured. For both the XP1702 and XP1722, the maximum gain variation over all 64 channels is less than 3:1, while the difference between any two adjacent channels is less than 2:1. Crosstalk to the nearest neighbor is around 10% for the fiber optic input window tube compared with 20% for the glass input window tube and is relatively insensitive to the size and numerical aperture of the optical fiber used. Dynode linearity range is maintained up to a signal level of 400 photoelectrons. Images obtained with a 511 KeV source irradiating an 8×8 array of 2×2×10 mm BGO crystals coupled by optical fiber to these tubes show excellent crystal identification, particularly using the lower crosstalk XP1722 MC-PMT

Published in:

Nuclear Science Symposium and Medical Imaging Conference Record, 1995., 1995 IEEE  (Volume:2 )

Date of Conference:

21-28 Oct 1995

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