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首页> 外文期刊>IEEE Transactions on Medical Imaging >Assessment of response function in two PET scanners with and without interplane septa
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Assessment of response function in two PET scanners with and without interplane septa

机译:评估两个带和不带平面间隔的PET扫描仪的响应功能

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The authors have assessed the response function both experimentally and theoretically for two commercial tomographs: CTI 931/08-12 and CTI 953B with and without interplane septa. Monte Carlo simulations were undertaken using the GEANT package from CERN. Spatial resolution (tomographic and axial) was calculated for line sources at various positions in the field of view. Sensitivity and scatter fraction (SF) were calculated for various source geometries as a function of energy discrimination. A very realistic response function in positron emission tomography (PET) is obtained by Monte Carlo methods, using global parameters to account for unsimulated phenomena such as scintillation light transport inside a detector block and its sharing among the various phototubes. Minor discrepancies remain for sensitivity and SF at high energy thresholds and may probably be explained by introducing the observed dispersion in the energy response for the various crystals within a detector block.
机译:作者已经在理论上和实验上评估了两种商用断层扫描仪的响应功能:CTI 931 / 08-12和CTI 953B(带和不带平面间隔)。使用CERN的GEANT软件包进行了蒙特卡洛模拟。计算了视野中各个位置处的线源的空间分辨率(断层和轴向)。计算了各种能量源几何形状的灵敏度和散射分数(SF),作为能量判别的函数。正电子发射断层扫描(PET)中非常真实的响应函数是通过Monte Carlo方法获得的,使用全局参数来说明未模拟的现象,例如闪烁的光在检测器块内部的传输以及在各个光电管之间的共享。在高能量阈值时,灵敏度和SF仍存在微小差异,可能可以通过在检测器块内为各种晶体引入观察到的能量响应色散来解释。

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