Characterization and quality control of avalanche photodiode arrays for the Clear-PEM detector modules

被引:6
作者
Abreu, Conceicao
Amaral, Pedro
Carrico, Bruno
Ferreira, Miguel
Luyten, Joan
Moura, Rui
Ortigao, Catarina
Rato, Pedro
Varela, Joao
机构
[1] LIP, P-1000149 Lisbon, Portugal
[2] UALG, P-8000117 Faro, Portugal
[3] IST, P-1049001 Lisbon, Portugal
关键词
avalanche photodiode; dark current; gain; positron emission mammography; quality control;
D O I
10.1016/j.nima.2007.01.112
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Clear-PEM is a Positron Emission Mammography (PEM) prototype being developed in the framework of the Crystal Clear Collaboration at CERN. This device is a dedicated PET camera for mammography, based on LYSO:Ce scintillator crystals, Avalanche PhotoDiodes (APD) and a fast, low-noise electronics readout system, designed to examine both the breast and the axillary lymph node areas, and aiming at the detection of tumors down to 2 mm in diameter. The prototype has two planar detector heads, each composed of 96 detector modules. The Clear-PEM detector module is composed of a matrix of 32 identical 2 x 2 x 20 mm(3) LYSO:Ce crystals read at both ends by Hamamatsu S8550 APD arrays (4 x 8) for Depth-of-Interaction (Dol) capability. The APD arrays were characterized by the measurement of gain and dark current as a function of bias voltage, under controlled temperature conditions. Two independent setups were used. The full set of 398 APD arrays followed a well-defined quality control (QC) protocol, aiming at the rejection of arrays not complying within defined specifications. From a total of 398 arrays, only 2 (0.5%) were rejected, reassuring the trust in these detectors for prototype assembly and future developments. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:19 / 22
页数:4
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