Analytical model for SPECT detector concepts
Analytical model for SPECT detector concepts
复制标题
SPECT 探测器概念的分析模型
DOI：
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发表时间：
2006
影响因子：
1.8
通讯作者：
A. Goedicke
中科院分区：
文献类型：
--
作者：
H. Wieczorek;A. Goedicke
像素化镉锌碲化（CZT）探测器，提供比目前的伽玛相机更高的空间分辨率和能量分辨率，将提高SPECT探测器系统的图像质量。它们的性能必须在分辨率、探测器效率和图像质量方面进行评估，就像之前对NaI探测器所做的那样。我们已经开发了一个分析模型的空间分辨率和准直器的几何效率，特别是像素化CZT为基础的探测器。我们推导了各种静态和旋转探测器概念的精确描述，使用标准的检测效率性能标准，并根据单像素响应函数（SPRF）的采样调整像素化探测器的空间分辨率措施。该概念被扩展到能够对基于连续闪烁体的SPECT相机进行比较描述。在分辨率、效率、信噪比（SNR）和最小可检测对比度之间的权衡研究了不同的检测器概念。我们的分析表明，除了纯热点成像外，使用旋转准直器的概念会受到噪声积累的影响。基于该分析模型可以对现有SPECT系统进行有限优化，并通过提高固体探测器的空间分辨率和能量分辨率来进一步提高图像质量。
Pixellated cadmium-zinc telluride (CZT) detectors, providing higher spatial resolution and energy resolution than current gamma cameras, will improve the image quality of SPECT detector systems. Their performance has to be evaluated in terms of resolution, detector efficiency and image quality in a similar way as has been done earlier for NaI detectors. We have developed an analytical model for spatial resolution and geometric efficiency of collimators specifically for pixellated CZT based detectors. We derive an exact description for a variety of static and rotating detector concepts, use standard performance criteria for detection efficiency, and adapt measures for spatial resolution of pixellated detectors, based on the sampling of the single pixel response function (SPRF). The concept is extended to enable a comparative description of continuous scintillator based SPECT cameras. Tradeoffs among resolution, efficiency, signal-to-noise ratio (SNR) and minimum detectable contrast have been investigated for different detector concepts. Our analysis shows that concepts using rotating collimators suffer from noise accumulation, except for purely hot spot imaging. A finite optimization of current SPECT systems can be done based on this analytical model, and a further increase in image quality will be achieved by the higher spatial resolution and energy resolution of solid-state detectors.
影响因子：
3.5
作者：
G. Gullberg;G. L. Zeng;F. Datz;P. Christian;C. Tung;H. Morgan
通讯作者：
G. Gullberg;G. L. Zeng;F. Datz;P. Christian;C. Tung;H. Morgan
使用旋转狭缝孔径和旋转准直器成像。
影响因子：
3.8
作者：
Gindi,GR;Arendt,J;Barrett,HH;Chiu,MY;Ervin,A;Giles,CL;Kujoory,MA;Miller,EL;Simpson,RG
通讯作者：
Simpson,RG