ROOM-TEMPERATURE LSO PIN PHOTODIODE PET DETECTOR MODULE THAT MEASURES DEPTH OF INTERACTION
ROOM-TEMPERATURE LSO PIN PHOTODIODE PET DETECTOR MODULE THAT MEASURES DEPTH OF INTERACTION
复制标题
DOI：
10.1109/23.467744
复制
发表时间：
1995-08-01
影响因子：
1.8
通讯作者：
MANENTE, RA
中科院分区：
文献类型：
--
作者：
MOSES, WW;DERENZO, SE;MANENTE, RA
我们提出了4元素PET探测器模块的测量，该模块使用3 mm见方的PIN光电二极管的2x2阵列来测量相互作用的深度（DOI）并识别相互作用的晶体。每个光电二极管耦合到3x3x25 mm LSO晶体的一端，所有4个晶体的相对端连接到提供定时信号和初始能量鉴别的单个PMT。每个LSO晶体都涂有一个“有损"反射器，因此光电二极管和PMT中检测到的光的比率取决于晶体中相互作用的位置，并用于逐个事件确定该位置。该模块在+25 °C下工作，光电二极管放大器峰值时间为2 μ s。当在模块的光电二极管端（即最靠近患者）处由511 keV光子的准直光束激发时，DOI分辨率为4 mm fwhm，并且95%的时间正确识别相互作用晶体。当在模块的另一端激发时，DOI分辨率为13 mm fwhm，并且在73%的时间内正确识别相互作用的晶体。信道间的性能差异很小。
We present measurements of a 4 element PET detector module that uses a 2x2 array of 3 mm square PIN photodiodes to both measure the depth of interaction (DOI) and identify the crystal of interaction. Each photodiode is coupled to one end of a 3x3x25 mm LSO crystal, with the opposite ends of all 4 crystals attached to a single PMT that provides a timing signal and initial energy discrimination. Each LSO crystal is coated with a ''lossy'' reflector, so the ratio of light detected in the photodiode and PMT depends on the position of interaction in the crystal, and is used to determine this position on an event by event basis, This module is operated at +25 degrees C with a photodiode amplifier peaking time of 2 mu s. When excited by a collimated beam of 511 keV photons at the photodiode end of the module (i.e. closest to the patient), the DOI resolution is 4 mm fwhm and the crystal of interaction is identified correctly 95% of the time. When excited at the opposite end of the module, the DOI resolution is 13 mm fwhm and the crystal of interaction is identified correctly 73% of the time. The channel to channel variations in performance are minimal.