Practical evaluation of several cone beam orbits for SPECT

IEEE Conference on Nuclear Science Symposium and Medical Imaging Pub Date : 1992-10-25 DOI:10.1109/NSSMIC.1992.301030

S. Manglos, B.D. Smith

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引用次数: 6

Abstract

Several alternative orbits have been suggested for cone beam SPECT (single photon emission computed tomography) since the standard circular orbit provides insufficient sampling. The authors used a computer simulation to evaluate the practicality of several orbits using the following criteria: spatial resolution, sensitivity, elimination of truncation, and theoretical sufficiency of the acquired data. All orbits were evaluated for brain imaging with a realistic human model. The results indicate that the simple transverse circular orbit has high sensitivity and resolution, but of course the acquired data are insufficient. Modest improvement in resolution was obtained with a contoured transverse plane orbit. A single straight line orbit was inadequate. Three orbits, each composed of two noncoplanar curves, satisfied the sufficiency condition, and thus should produce more accurate reconstructions. Their resolution was similar to the circle, but the sensitivity was reduced by 15-30%. None of the orbits studied was as good as the transverse plane orbits (circle and contoured) in both resolution and sensitivity.<>

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SPECT几种锥束轨道的实用评价

由于标准的圆形轨道不能提供足够的采样，锥束SPECT(单光子发射计算机断层扫描)的几种替代轨道已经被提出。作者使用计算机模拟来评估几种轨道的实用性，使用以下标准:空间分辨率，灵敏度，消除截断，以及所获取数据的理论充分性。所有的轨道都用真实的人体模型进行了脑成像评估。结果表明，简单横圆轨道具有较高的灵敏度和分辨率，但采集到的数据不足。采用等高线横向平面轨道，分辨率略有提高。单一的直线轨道是不够的。由两条非共面曲线组成的三个轨道满足充分性条件，因此应该产生更精确的重建。它们的分辨率与圆相似，但灵敏度降低了15-30%。所研究的轨道在分辨率和灵敏度上都不如横向平面轨道(圆形和等高线)。

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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IEEE Conference on Nuclear Science Symposium and Medical Imaging

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