ADVANCED HIGH SPEED HIGH RESOLUTION POSITRON TOMOGRAPH

该项目的总体目标是提供一个先进的 医用动物全身/人脑正电子体层摄影机 科学项目。 这台断层摄影机将使定量 在动物模型中测量心血管生理学， 允许快速团注的高计数率动态研究 流动和代谢示踪剂。 它具有以下高级功能： 正硅酸镥（LSO）分解器，具有6倍 光输出更强，衰减时间比铋快8倍 锗酸盐（BGO）。 光电倍增管读数提供脉冲 高度信息（以拒绝散射的湮灭光子）和 定时分辨率小于1 ns（以抑制随机背景）。 小晶体（1.5 - 2.5 mm），通过低噪声单独读取 硅光电二极管。 交互作用深度测量小于 2 mm空间分辨率。 小检测器 35 cm的直径，低非共线性误差，高灵敏度， 并且降低了成本。 在30 cm的受试者端口上的全3D模式， 15 cm的轴向视野（无平面间隔膜），用于高灵敏度 以及大于700 k/s的最大噪声等效事件速率 1 μ Ci/m1。 我们希望美国能源部的资金 将支持购买270所需的组件 探测器模块，CTI PET系统将提供劳动力， 组装和测试它们，这个项目将提供 以下内容：预生产的构建、测试和评估 检测模块。 将270个预先测试的探测器模块组装在 LBL的一个台架 评估完成的高分辨率 断层摄影机 发展衰减测量，背景 校正和校准程序。 该项目将推进 通过发展飞行时间能力， 将其安装在高分辨率的LSO断层扫描仪上。 我们的目标是一个 定时分辨率小于500 ps，对应于小于 7.5厘米 这提高了信噪比， 通过进一步减少随机性来重建3D图像 巧合的背景，并通过在3D中定位事件， 减少重建过程中的误差传播。

The overall objective of this project is to provide an advanced animal whole body/human brain positron tomograph for the medical science projects. This tomograph will make possible quantitative measurements of cardiovascular physiology in animal models by permitting high count rate dynamic studies with bolus injections of flow and metabolic tracers. It has the following advanced features: Lutetium orthosilicate (LSO) scintillators, which have 6 times greater light output and 8 times faster decay time than bismuth germanate (BGO). Photomultiplier tube readout to provide pulse height information (to reject scattered annihilation photons) and a timing resolution less than 1 ns (to reject random backgrounds). Small (1.5 - 2.5 mm) crystals, read out individually by low-noise silicon photodiodes. Depth of interaction measurement for less than 2 mm spatial resolution over the imaging volume. Small detector dimaeter of 35 cm for low noncollinearity error, high sensitivity, and reduced cost. Full 3D mode over a subject port of 30 cm and an axial field of 15 cm (no inter-plane septa), for high sensitivity and a maximum noise equivalent event rate of greater than 700 k/s at 1 muCi/m1. We expect that U.S. Department of Energy funding will support purchase of the components needed for the 270 detector modules, that CTI PET Systems will provide the labor to assemble and test them, and that this project will provide the following: Construction, testing, and evaluation of pre-production detection modules. Assembling 270 pre-tested detector modules in a gantry at LBL. Evaluating the completed high resolution tomograph. Developing attenuation measurement, background correction, and calibration procedures. This project will advance the technology further by developing time-of-flight capability and installing it in the high resolution LSO tomograph. Our goal is a timing resolution less than 500 ps, which corresponds to less than 7.5 cm. This improves the signal-to-noise ration in the reconstructed 3D images by further reducing the random coincidence background and by localizing the events in 3D to reduce error propagation in the reconstruction process.