Fast-channel LSO detectors and fiber-optic encoding for excellent dual photon transmission measurements in PET

1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255) Pub Date : 1998-11-08 DOI:10.1109/NSSMIC.1998.774355

W. Jones, J. C. Moyers, M. Casey, C. Watson, R. Nutt

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引用次数: 11

Abstract

Improved attenuation correction remains critical to PET. Currently with dual photon rotating rod sources, benefits of windowing are limited by counting losses of detectors nearest the rods, the near detectors. With single photon sources, improved statistics are offset by a greater need for collimation and more complex emission background correction. Now, a dual photon point source array with fast-channel, near detectors improves on these earlier techniques-here, adding transmission measurement to dual-head rotating PET. Arrays of collimated point sources (/sup 68/Ge/Ga-3 to 21 per head) are aligned axially and orbit the FOV. With each source is a dedicated near detector (LSO crystal). Crystals couple to photomultipliers (PMTs). As the crystals are not "block" encoded, pulse processing time is reduced (to 120 ns). Reduced processing time lowers dead time and permits hotter sources. For improved axial sampling, larger arrays (21 sources/head) may be configured. To reduce cost, crystals couple fiber-optically into unique PMT pairs-decreasing the total number of near-detector PMTs by 71%.

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用于PET中优异双光子传输测量的快速通道LSO探测器和光纤编码

改进的衰减校正仍然是PET的关键。目前，对于双光子旋转棒源，窗口的好处受限于最接近棒的探测器(近探测器)的损失计算。对于单光子源，改进的统计数据被更大的准直需求和更复杂的发射背景校正所抵消。现在，一种双光子点源阵列与快速通道，近探测器改进了这些早期的技术，在这里，增加了传输测量双头旋转PET。准直点源阵列(/sup 68/Ge/Ga-3至21 /头)轴向对齐并绕视场运行。与每个源是一个专用的近探测器(LSO晶体)。晶体耦合到光电倍增管(pmt)。由于晶体不是“块”编码，脉冲处理时间减少(至120纳秒)。减少处理时间，降低死区时间，并允许热源。为了改进轴向采样，可以配置更大的阵列(21个源/头)。为了降低成本，晶体将光纤耦合成独特的PMT对，将近探测器PMT的总数减少了71%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1998 IEEE Nuclear Science Symposium Conference Record. 1998 IEEE Nuclear Science Symposium and Medical Imaging Conference (Cat. No.98CH36255)

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