发明名称 |
TEMPERATURE COMPENSATION AND CONTROL CIRCUIT FOR SINGLE PHOTON COUNTERS |
摘要 |
A PET scanner (10) includes a ring of detector modules (16) encircling an imaging region (18). Each of the detector modules includes one or more sensor avalanche photodiodes (APDs) (34) that are biased in a breakdown region in a Geiger mode. The sensor APDs (34) output pulses in response to light from a scintillator corresponding to incident photons. A reference APD (36) also biased in a breakdown region in a Geiger mode is optically shielded from light and outputs a voltage that is measured by an analog to digital converter (44). Based on the measurement, a bias control feedback loop (42) directs a variable voltage generator (48) to adjust a bias voltage applied to the APDs (34, 36) such that a difference (86) between a voltage of a breakdown pulse (68) and a preselected logic voltage level (70) is minimized. |
申请公布号 |
WO2010100574(A3) |
申请公布日期 |
2011.08.11 |
申请号 |
WO2010IB50539 |
申请日期 |
2010.02.05 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V.;PHILIPS INTELLECTUAL PROPERTY & STANDARDS GMBH;FRACH, THOMAS |
发明人 |
FRACH, THOMAS |
分类号 |
G01T1/20;G01T1/40;G01T7/00 |
主分类号 |
G01T1/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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