X射线重建断层扫描中的统计局限性。
Statistical limitations in x-ray reconstructive tomography.
作者信息
Brooks R A, Di Chiro G
出版信息
Med Phys. 1976 Jul-Aug;3(4):237-40. doi: 10.1118/1.594240.
DOI:10.1118/1.594240
PMID:785201
Abstract
Statistical fluctuations, or noise, in reconstructed tomograms are analyzed as a function of x-ray energy. The result is essentially constant for energies above 50 keV, assuming constant dose and spatial resolution, and is in close agreement with the actual performance of the EMI-Scanner (water-bag model). The noise is inversely proportional to the square of cell dimensions. For scanners without a water bag, the theoretical noise is approximately 30% less.
摘要
对重建断层图像中的统计波动或噪声作为X射线能量的函数进行了分析。假设剂量和空间分辨率恒定，对于能量高于50keV的情况，结果基本恒定，并且与EMI扫描仪（水袋模型）的实际性能密切相符。噪声与单元尺寸的平方成反比。对于没有水袋的扫描仪，理论噪声大约低30%。
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