Lutetium oxyorthosilicate block detector readout by avalanche photodiode arrays for high resolution animal PET

被引:47
|
作者
Pichler, BJ [1 ]
Swann, BK
Rochelle, J
Nutt, RE
Cherry, SR
Siegel, SB
机构
[1] Univ Calif Davis, Dept Biomed Engn, Davis, CA 95616 USA
[2] Concorde Microsyst Inc, Knoxville, TN USA
来源
PHYSICS IN MEDICINE AND BIOLOGY | 2004年 / 49卷 / 18期
关键词
D O I
10.1088/0031-9155/49/18/008
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Avalanche photodiodes (APDs) have proven to be useful as light detectors for high resolution positron emission tomography (PET). Their compactness makes these devices excellent candidates for replacing bulky photomultiplier tubes (PMTs) in PET systems where space limitations are an issue. The readout of densely packed, 10 x 10 lutetium oxyorthosilicate (LSO) block detectors (crystal size 2.0 x 2.0 x 12 mm(3)) with custom-built monolithic 3 x 3 APD arrays was investigated. The APDs had a 5 x 5 mm(2) active surface and were arranged on a 6.25 mm pitch. The dead space on the edges of the array was 1.25 mm. The APDs were operated at a bias voltage of approximately 380 V for a gain of 100 and a dark current of 10 nA per APD. The standard deviation in gain between the APDs in the array ranged from 1.8 to 6.5% as the gain was varied from 50 to 108. A fast, low-noise, multi-channel charge sensitive preamplifier application-specific integrated circuit (ASIC) was developed for the APD readout. The amplifier had a rise time of 8 ns, a noise floor of 515 e(-) rms and a 9 e(-) pF(-1) noise slope. An acquired flood image showed that all 100 crystals from the block detector could be resolved. Timing measurements with single-channel LSO-APD detectors, as well as with the array, against a plastic scintillator and PMT assembly showed a time resolution of 1.2 ns and 2.5 ns, respectively. The energy resolution measured with a single 4.0 x 4.0 x 10 mm(3) LSO crystal, wrapped in four-layer polytetrafluoroethylene (PTFE) tape and coupled with optical grease on a single APD of the array, yielded 15% (full width at half maximum, FWHM) at 511 keV. Stability tests over 9 months of operation showed that the APD arrays do not degrade appreciably. These results demonstrate the ability to decode densely packed LSO scintillation blocks with compact APD arrays.
引用
收藏
页码:4305 / 4319
页数:15
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