Abstract: In this paper, characterization of new, planar silicon avalanche photodiode arrays for high-resolution PET applications is discussed. High gain, monolithic 4 $MUL 4 element APD arrays (2 mm pixels) have been fabricated using planar processes. These devices were characterized by measuring their gain ($GRT 10$+3$/), quantum efficiency (60% at LSO emission) and noise (200 eV FWHM). Energy and timing resolution of these APDs were also measured by coupling them to LSO scintillators (2 $MUL 2 $MUL 10 mm) and were found to be 12% and 4 ns, respectively. An APD array was also coupled to a matching LSO array and successful experiments were conducted to identify the crystal which scintillated. Finally, initial experiments to measure depth of interaction have also been performed.!9
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机译：摘要：本文讨论了用于高分辨率PET应用的新型平面硅雪崩光电二极管阵列的表征。高增益，单片4 $ MUL 4元素APD阵列（2毫米像素）已使用平面工艺制造。这些设备的特征在于测量其增益（$ GRT 10 $ + 3 $ /），量子效率（LSO发射时为60％）和噪声（200 eV FWHM）。还通过将这些APD耦合到LSO闪烁器（2 $ MUL 2 $ MUL 10 mm）来测量它们的能量和定时分辨率，发现分别为12％和4 ns。 APD阵列也与匹配的LSO阵列耦合，并进行了成功的实验以鉴定闪烁的晶体。最后，还进行了测量相互作用深度的初步实验。9
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