USE OF DIGITAL FRONT-END ELECTRONICS FOR OPTIMIZATION OF A MODULAR PET DETECTOR
USE OF DIGITAL FRONT-END ELECTRONICS FOR OPTIMIZATION OF A MODULAR PET DETECTOR
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DOI：
10.1109/42.293933
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发表时间：
1994-06-01
影响因子：
10.6
通讯作者：
HOFFMAN, EJ
中科院分区：
文献类型：
--
作者：
CUTLER, PD;HOFFMAN, EJ
研究了一种新型二维模块化PET BGO探测器系统的灵敏度和分辨率对最终图像信噪比的影响。探测器系统使用定制的硬件和固件来调整灵敏度和分辨率，以达到最佳性能。该系统利用查找表（LUT）包含单独定制的定位和能量窗口，以确保事件在探测器元素之间正确分布。在没有定制LUT的情况下，对于一个共同的能量窗口，发现灵敏度在单个检测器模块内从中心到边缘的变化高达3.5倍，分辨率高达50%。测试了8种不同的LUT配置，改变了能量窗口和定位标准。在所有配置下，测量了探测器元件的典型固有分辨率和灵敏度。通过在大范围累积事件上对均匀圆柱体成像，评估了探测器系统灵敏度的非均匀性对图像噪声的影响。计数统计量在探测器灵敏度测量中对正弦图数据归一化的影响是独立确定的。与PET系统的默认配置相比，最佳的LUT配置提供了16%的有效灵敏度提高，同时也提供了10%的平均固有空间分辨率提高。
The sensitivity and resolution of a new 2-D modular BGO detector system for PET was examined in terms of its effect on the signal to noise ratio in the final image. The detector system uses custom hardware and firmware to adjust sensitivity and resolution to achieve optimum performance. This system utilizes lookup up tables (LUT) containing individually tailored positioning and energy windows to assure that events are correctly distributed among the detector elements. Without customizing the LUT, and for a common energy window, sensitivity was found to vary as much as a factor of 3.5 and resolution as much as 50% from center to edge within a single detector module. Eight different LUT configurations were tested, varying both energy window and positioning criteria. Typical intrinsic resolutions and sensitivities of the detector elements were determined in all configurations. The effect of nonuniformity of sensitivity of the detector system on image noise was evaluated by imaging uniform cylinders over a wide range of accumulated events. The effect of counting statistics in the measurement of detector sensitivities for the normalization of sinogram data was determined independently. The best of the LUT configurations provided an 16% improvement in effective sensitivity, while also providing a 10% improvement in the average intrinsic spatial resolution relative to the default configuration of the PET system.