Arrays of Segmented, Tapered Light Guides for Use with Large, Planar Scintillation Detectors.
Arrays of Segmented, Tapered Light Guides for Use with Large, Planar Scintillation Detectors.
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DOI：
10.1109/tns.2015.2392085
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发表时间：
2015-06
影响因子：
1.8
通讯作者：
Jaliparthi G
中科院分区：
文献类型：
--
作者：
Raylman RR;Vaigneur K;Stolin AV;Jaliparthi G
代谢成像技术可以潜在地改善放射性致密和/或纤维囊性乳房的女性癌症的检测和诊断。我们的小组以前开发了一种高分辨率正电子发射断层扫描成像和活检设备（PEM-PET），以检测和指导可疑乳腺病变的活检。初步测试显示，扫描仪的成像视场（FOV）小于探测器有效区域的物理尺寸，这可能会阻碍对靠近胸壁的乳房区域进行采样。这项工作的目的是利用分段的锥形光导将闪烁体阵列光学耦合到位置敏感光电倍增管阵列，以增加有效FOV和单个闪烁体元件的识别。对新系统的测试表明，这些结构的光学特性使得从探测器表面的整个有效区域辨别探测器元件成为可能。在以前的系统中，顶行和底行以及左列和右列是不可识别的。此外，新光导的使用将单个探测器元件的对比度提高了129%。改进的元素识别导致空间分辨率增加约12%。由于光在光导中的衰减，检测器能量分辨率从18.5%下降到19.1%。总的来说，这些改进应该增加专用乳房PET系统的视野和空间分辨率。
Metabolic imaging techniques can potentially improve detection and diagnosis of cancer in women with radiodense and/or fibrocystic breasts. Our group has previously developed a high-resolution positron emission tomography imaging and biopsy device (PEM-PET) to detect and guide the biopsy of suspicious breast lesions. Initial testing revealed that the imaging field-of-view (FOV) of the scanner was smaller than the physical size of the detector’s active area, which could hinder sampling of breast areas close to the chest wall. The purpose of this work was to utilize segmented, tapered light guides for optically coupling the scintillator arrays to arrays of position-sensitive photomultipliers to increase both the active FOV and identification of individual scintillator elements. Testing of the new system revealed that the optics of these structures made it possible to discern detector elements from the complete active area of the detector face. In the previous system the top and bottom rows and left and right columns were not identifiable. Additionally, use of the new light guides increased the contrast of individual detector elements by up to 129%. Improved element identification led to a spatial resolution increase by approximately 12%. Due to attenuation of light in the light guides the detector energy resolution decreased from 18.5% to 19.1%. Overall, these improvements should increase the field-of-view and spatial resolution of the dedicated breast-PET system.