Development of a Cost-Effective Modular Pixelated NaI(Tl) Detector for Clinical SPECT Applications.
Development of a Cost-Effective Modular Pixelated NaI(Tl) Detector for Clinical SPECT Applications.
复制标题
DOI：
10.1109/tns.2012.2210908
复制
发表时间：
2012-08-30
影响因子：
1.8
通讯作者：
Chang W
中科院分区：
文献类型：
--
作者：
Rozler M;Liang H;Chang W
设计并测试了一种用于高分辨率临床SPECT应用的新型像素化探测器。模块化探测器基于由2.75×2.75×10 mm3 NaI（Tl）像素组成的闪烁体块，并由51 mm直径的单阳极PMT阵列解码。几种配置，利用两种类型的光电倍增管，使用准直光束源直接测量定位精度进行了评估。观察到良好的像素分离，根据PMT类型和配置，在模块的整个区域上平均的正确像素识别范围为60%至72%。与相同厚度的连续板检测器相比，这转化为定位精度的显著提高，沿着有效地减少了边缘处的“死”空间。所观察到的10%的平均能量分辨率与连续板探测器相比很好。综合性能证明了像素化探测器的适用性，解码与相对少量的中型光电倍增管作为高分辨率的临床SPECT应用，特别是那些涉及弯曲的探测器的几何形状的成本效益的方法。
A new pixelated detector for high-resolution clinical SPECT applications was designed and tested. The modular detector is based on a scintillator block comprised of 2.75×2.75×10 mm3 NaI(Tl) pixels and decoded by an array of 51 mm diameter single-anode PMTs. Several configurations, utilizing two types of PMTs, were evaluated using a collimated beam source to measure positioning accuracy directly. Good pixel separation was observed, with correct pixel identification ranging from 60 to 72% averaged over the entire area of the modules, depending on the PMT type and configuration. This translates to a significant improvement in positioning accuracy compared to continuous slab detectors of the same thickness, along with effective reduction of “dead” space at the edges. The observed 10% average energy resolution compares well to continuous slab detectors. The combined performance demonstrates the suitability of pixelated detectors decoded with a relatively small number of medium-sized PMTs as a cost-effective approach for high resolution clinical SPECT applications, in particular those involving curved detector geometries.