A novel compact gamma camera based on flat panel PMT
A novel compact gamma camera based on flat panel PMT
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一种基于平板PMT的新型紧凑型伽马相机
DOI：
10.1016/s0168-9002(03)02132-6
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发表时间：
2003
影响因子：
1.4
通讯作者：
A. Guerra
中科院分区：
文献类型：
--
作者：
R. Pani;R. Pellegrini;M. Cinti;C. Trotta;G. Trotta;R. Scafè;M. Betti;F. Cusanno;L. Montani;G. Iurlaro;F. Garibaldi;A. Guerra
在过去的十年中，位置敏感探测器的强大技术进步鼓励科学界开发专用成像仪，用于同位素功能成像领域的新诊断技术。新探测器的主要特点是紧凑性，允许适合人体解剖结构的合适的检测几何形状。位置敏感光电倍增管（PSPMT）已经显示出非常好的功能，并不断改进。1997年提出了一种基于第二代1in PSPMT密集阵列的新型伽马相机。主要优点是潜在的无限检测区域，但缺点是相对较大的非活动区域（30%）。Hamamatsu H8500平板PMT代表了最后一代PSPMT。它的极端紧凑性使阵列组装的有效面积提高到97%。本文评估了基于新的PSPMT的伽马相机的成像性能的潜在改进，与前两代PSPMT相比。为此，分析了影响伽玛相机最终响应的因素，如PSPMT增益、阳极变化和位置分辨率，并将其与均匀性计数响应、能量分辨率、位置线性、探测效率和固有空间分辨率联系起来。结果表明，脉冲高度响应的均匀性似乎是提供最佳成像性能的主要参数。此外，像素的极端识别似乎对图像均匀性计数和增益响应的完全校正无效。然而，考虑到目前的技术限制，平板PSPMT可能是伽马相机成像性能、紧凑性和大检测区域之间的最佳折衷。
Over the last ten years the strong technological advances in position sensitive detectors have encouraged the scientific community to develop dedicated imagers for new diagnostic techniques in the field of isotope functional imaging. The main feature of the new detectors is the compactness that allows suitable detection geometry fitting the body anatomy. Position sensitive photomultiplier tubes (PSPMTs) have been showing very good features with continuous improvement. In 1997 a novel gamma camera was proposed based on a closely packed array of second generation 1in PSPMTs. The main advantage is the potentially unlimited detection area but with the disadvantage of a relatively large non-active area (30%). The Hamamatsu H8500 Flat Panel PMT represents the last generation of PSPMT. Its extreme compactness allows array assembly with an improved effective area up to 97%. This paper, evaluates the potential improvement of imaging performances of a gamma camera based on the new PSPMT, compared with the two previous generation PSPMTs. To this aim the factors affecting the gamma camera final response, like PSPMT gain anode variation and position resolution, are analyzed and related to the uniformity counting response, energy resolution, position linearity, detection efficiency and intrinsic spatial resolution. The results show that uniformity of pulse height response seems to be the main parameter that provides the best imaging performances. Furthermore an extreme identification of pixels seems to be not effective to a full correction of image uniformity counting and gain response. However, considering the present technological limits, Flat Panel PSPMTs could be the best trade off between gamma camera imaging performances, compactness and large detection area.