Properties of preprocessed sinogram data in x-ray computed tomography
Properties of preprocessed sinogram data in x-ray computed tomography
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DOI：
10.1118/1.2230762
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发表时间：
2006-09-01
期刊：
影响因子：
3.8
通讯作者：
Williamson, Jeffrey F.
中科院分区：
文献类型：
--
作者：
Whiting, Bruce R.;Massoumzadeh, Parinaz;Williamson, Jeffrey F.
X 射线信号特性的准确确定对于多个计算机断层扫描 (CT) 研究和开发领域非常重要，特别是对于统计重建算法和剂量减少模拟。最常用的 CT 信号形成模型（假设单能 X 射线源和量子计数探测器遵循简单的泊松统计）并不反映 CT 采集的实际物理现象。本文描述了一个更准确的模型，考虑了能量积分检测过程、非均匀通量分布和数据调节过程。开发了实验测量和理论上计算统计分布的方法，以及分析 CT 信号特性的技术。结果表明了当前模型的局限性，并建议对 CT 信号属性的描述进行改进。 (c) 2006 年美国医学物理学家协会。
The accurate determination of x-ray signal properties is important to several computed tomography (CT) research and development areas, notably for statistical reconstruction algorithms and dose-reduction simulation. The most commonly used model of CT signal formation, assuming monoenergetic x-ray sources with quantum counting detectors obeying simple Poisson statistics, does not reflect the actual physics of CT acquisition. This paper describes a more accurate model, taking into account the energy-integrating detection process, nonuniform flux profiles, and data-conditioning processes. Methods are developed to experimentally measure and theoretically calculate statistical distributions, as well as techniques to analyze CT signal properties. Results indicate the limitations of current models and suggest improvements for the description of CT signal properties. (c) 2006 American Association of Physicists in Medicine.