The Effect of Live Time in Components of a Positron Tomograph on Image Quantification

The Effect of Live Time in Components of a Positron Tomograph on Image Quantification
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正电子断层扫描仪组件的生存时间对图像量化的影响

DOI:
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发表时间:
1987
影响因子:
1.8
通讯作者:
E. Meyer
E. Meyer
中科院分区:
工程技术3区
文献类型:
--
作者:
C. Thompson;E. Meyer

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几个PET系统的生存时间的特点是在每个符合事件后的瘫痪时间。如果部分死区时间是由于晶体阵列中的光收集和位置编码引起的,则系统死区时间是单个与符合计数比的函数,该比值又取决于对象大小和放射性同位素分布。在这种情况下,有必要对探测器寿命进行独立测量。由于两个探测器必须是“活的”,以记录符合事件,探测器的系统生存时间的贡献是更明显的断层摄影使用位置编码方案。由于“死”探测器不能贡献随机事件,如果死时间是由探测器而不是由符合电路引起的,则随机率将较小。在分析了编码过程中每个阶段丢失事件的来源后,我们建议使用硬件来计算这些损失,而不是使用经验估计。
The livetime of several PET systems has been characterized in terms of a paralysing time after each coincidence event. If part of the deadtime is due to light collection and position encoding in a crystal array, the system deadtime is a function of the singles-to-coincidence-count ratio which in turn depends on the object size and radioisotope distribution. In this case it is necessary to make an independent measurement of the detector livetime. Since both detectors must be "live" to record a coincidence event, the detector contribution to system livetime is more pronounced in tomographs using position encoding schemes. Since "dead" detectors cannot contribute random events, the randoms rate will be less if deadtime is caused by the detectors rather than by the coincidence circuit. After analysing the sources of lost events at each stage in the encoding process we propose that, rather than using empi rical estimates, hardware be used to compute these losses.
DOI: 10.1088/0031-9155/30/5/002
发表时间: 1985-05
影响因子: 3.5
作者:
B. Mazoyer;M. Roos;R. Huesman
通讯作者: B. Mazoyer;M. Roos;R. Huesman
DOI: --
发表时间: 2006
期刊: --
影响因子: --
作者:
M. Mintun;M. Raichle;W. Martin
通讯作者: M. Mintun;M. Raichle;W. Martin
用于脑成像的正电子断层扫描仪的性能评估。
DOI: --
发表时间: 1983
期刊: Journal of nuclear medicine : official publication, Society of Nuclear Medicine
影响因子: --
作者:
Hoffman,EJ;Phelps,ME;Huang,SC
通讯作者: Huang,SC