A DEPTH-ENCODED PET DETECTOR
A DEPTH-ENCODED PET DETECTOR
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DOI：
10.1109/23.289382
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发表时间：
1991-04-01
影响因子：
1.8
通讯作者：
THOMPSON, CJ
中科院分区：
文献类型：
--
作者：
BARTZAKOS, P;THOMPSON, CJ
高分辨率正电子发射断层扫描（PET）中的径向模糊可以通过测量探测器晶体内PET光子的相互作用深度来减少。 模拟表明，将晶体分成两个等概率的相互作用区域几乎消除了这种模糊。 这是使用放置在距离前面1 cm的3 cm BGO晶体周围的黑带来完成的。 光电倍增管从晶体的背面收集光，用于能量和定时测量。 另一个PMT通过光导从晶体的顶部前端收集光，以确定相互作用的深度。在晶体前部相互作用的伽马射线在深度传感PMT中产生强信号，而在带后面的相互作用产生较弱（< 10%）的信号。 对于晶体中任何深度的相互作用，由能量PMT记录的光强度几乎是恒定的（在+/- 3%内）。
Radial blurring in high-resolution positron emission tomography (PET) can be reduced by measuring the PET photon's depth of interaction within a detector crystal. Simulations show that dividing the crystal into two equiprobable regions of interaction almost eliminates this blurring. This has been done using a black band placed around a 3 cm BGO crystal, 1 cm from the front. A PMT collects light from the rear of the crystal for energy and timing measurement. Another PMT collects light through a light guide from the top-front of the crystal to find the depth of interaction.Gamma rays interacting in the front of the crystal produce a strong, signal in the depth-sensing PMT, while interactions behind the band produce weaker (< 10%) signal. The intensity of the light recorded by the energy PMT is almost constant (within +/- 3%) for interactions at any depth in the crystal.