Kouris K, Garnett E S, Herman G T
J Comput Assist Tomogr. 1981 Oct;5(5):744-54. doi: 10.1097/00004728-198110000-00030.
The aim in positron emission tomography is to provide quantitative information about the uptake, localization, and turnover of labeled molecules in the human body. Instruments designed for this purpose are based on the coincidence detection of the emitted annihilation photons. In this paper, we examine those instruments that use a ring of detectors. We investigate such instruments with respect to their sampling properties in the stationary and half-rotation modes. It is shown that, although the half-rotation motion provides an improvement if the data are treated as a set of parallel projections, there is no improvement when divergent projections are assumed by the reconstruction procedure. The effects on reconstruction quality of the radial and the angular sampling in ring collected data are discussed and illustrated.
正电子发射断层扫描的目的是提供有关人体中标记分子的摄取、定位和周转的定量信息。为此目的设计的仪器基于对发射的湮灭光子的符合探测。在本文中，我们研究了使用探测器环的那些仪器。我们研究了这些仪器在静止和半旋转模式下的采样特性。结果表明，尽管如果将数据视为一组平行投影，半旋转运动会有所改进，但当重建过程假设为发散投影时则没有改进。讨论并说明了环收集数据中径向和角度采样对重建质量的影响。
