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
复制标题
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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复制
发表时间:
1987
影响因子:
1.8
通讯作者:
E. Meyer
中科院分区:
文献类型:
--
作者:
C. Thompson;E. Meyer
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.
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:
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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
DOI:
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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