This title appears in the Scientific Report :
2005
Please use the identifier:
http://dx.doi.org/10.1016/j.nima.2004.08.052 in citations.
Effects of Crosstalk and Gain Nonuniformity using Multichannel PMTs in the ClearPET Scanner
Effects of Crosstalk and Gain Nonuniformity using Multichannel PMTs in the ClearPET Scanner
The ClearPET(R) scanners developed by the Crystal Clear Collaboration use multichannel PMTs as photodetectors with scintillator pixels coupled individually to each channel. In order to localize an event each channel anode is connected to a comparator that triggers when the anode signal exceeds a com...
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Personal Name(s): | Streun, M. |
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Christ, D. / Hollendung, A. / Larue, H. / Ziemons, K. / Halling, H. | |
Contributing Institute: |
Zentralinstitut für Elektronik; ZEL |
Published in: | Nuclear instruments & methods in physics research / A, 537 (2005) |
Imprint: |
Amsterdam
North-Holland Publ. Co.
2005
|
DOI: |
10.1016/j.nima.2004.08.052 |
Document Type: |
Journal Article |
Research Program: |
Neurowissenschaften |
Series Title: |
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
537 |
Subject (ZB): | |
Publikationsportal JuSER |
The ClearPET(R) scanners developed by the Crystal Clear Collaboration use multichannel PMTs as photodetectors with scintillator pixels coupled individually to each channel. In order to localize an event each channel anode is connected to a comparator that triggers when the anode signal exceeds a common predefined threshold. Two major difficulties here are crosstalk of light and the gain nonuniformity of the PMT channels. Crosstalk can generate false triggering in channels adjacent to the actual event. On the one hand this can be suppressed by sufficiently increasing the threshold, but on the other hand a threshold too high can already prevent valid events on the lower gain channels from being detected. Finally, both effects restrict the dynamic range of pulse heights that can be processed. The requirements to the dynamic range are not low as the ClearPET(R) scanners detect the depth of interaction by phoswich pixels consisting of LSO and Lu(0.7)Y(0.3)AP, two scintillators with different light yields. We will present a model to estimate the achievable dynamic range and show solutions to increase it. (C) 2004 Elsevier B.V. All rights reserved. |