A GSO depth of interaction detector for PET
A GSO depth of interaction detector for PET
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DOI：
10.1109/23.681982
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发表时间：
1998-06-01
影响因子：
1.8
通讯作者：
Ishibashi, H
中科院分区：
文献类型：
--
作者：
Yamamoto, S;Ishibashi, H
我们开发了一种GSO相互作用深度探测器。选择3个不同Ce浓度的GSO闪烁体，沿相互作用方向的深度进行松解，并与光电倍增管（PMT）或位置敏感光电倍增管（PSPMT）进行光耦合。首先，通过测量脉冲形状、光输出和过零时间来选择不同Ce浓度的GSO闪烁体的合适组合。选择三个不同Ce浓度的GSO闪烁体，制作了一个单一的GSO/PMT相互作用深度探测器，以评估该方法的可行性。通过零交叉时间分析，得到了三个峰值对应于三个GSO闪烁体的衰减量。最后，制作了GSO/PSPMT相互作用块深度检测器并进行了测试。块探测器由7x7矩阵的GSO闪烁体组成，该闪烁体具有三层不同浓度的Ce光耦合到PSPMT上。脉冲形状分析用于确定相互作用方向的深度，Anger逻辑用于确定跨轴和轴向方向。在相互作用方向、跨轴方向和轴向方向上均有较好的分离效果。这些结果表明，GSO块探测器可能成为开发具有深度相互作用探测能力的正电子发射层析成像（PET）的一种解决方案。
We have developed a GSO depth of interaction detector. Three GSO scintillators with different concentration of Ce were chosen and, slacked along depth of interaction direction and optically coupled to a photomultiplier tube (PMT) or a position sensitive photomultiplier tube (PSPMT). In the beginning, pulse shape, light output and zero-cross time were measured to select a proper combination of GSO scintillators with different concentration of Ce. Selecting three GSO scintillators with different concentration of Ce, a single slacked GSO/PMT depth of interaction detector was fabricated for estimating the possibility of this method. Using the zero-cross time analysis, three peaks correspond to decay limes of the three GSO scintillators were obtained. Finally, a GSO/PSPMT depth of interaction block detector was fabricated and tested. The block detector consists of 7x7 matrix of GSO scintillators which have three layers of different concentration of Ce optically coupled to a PSPMT. The pulse shape analysis was used for determination of depth of interaction direction while the Anger logic was used for transaxial and axial directions. Good separation was observed in depth of interaction direction as well as transaxial and axial directions. These results indicate that the GSO block detector may become one solution to develop a positron emission tomograph (PET) with depth of interaction detection capability.