Artifacts in CT: Recognition and avoidance
Artifacts in CT: Recognition and avoidance
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DOI：
10.1148/rg.246045065
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发表时间：
2004-11-01
期刊：
影响因子：
5.5
通讯作者：
Keat, N
中科院分区：
文献类型：
--
作者：
Barrett, JF;Keat, N
伪影会严重降低计算机断层扫描（CT）图像的质量，有时甚至会使其无法用于诊断。为了优化图像质量，有必要了解为什么会出现伪影以及如何防止或抑制伪影。CT伪影来源于一系列源。基于物理的伪影来自CT数据采集中涉及的物理过程。基于患者的伪影是由患者移动或患者体内或体表存在金属材料等因素引起的。基于扫描仪的伪影由扫描仪功能的缺陷引起。图像重建过程会产生螺旋和多节段技术伪影。现代CT扫描仪的设计功能可最大限度地减少某些类型的伪影，有些可以通过扫描仪软件进行部分校正。然而，在许多情况下，仔细的患者定位和扫描参数的最佳选择是避免CT伪影的最重要因素。(C)RSNA，2004年。
Artifacts can seriously degrade the quality of computed tomographic (CT) images, sometimes to the point of making them diagnostically unusable. To optimize image quality, it is necessary to understand why artifacts occur and how they can be prevented or suppressed. CT artifacts originate from a range of sources. Physics-based artifacts result from the physical processes involved in the acquisition of CT data. Patient-based artifacts are caused by such factors as patient movement or the presence of metallic materials in or on the patient. Scanner-based artifacts result from imperfections in scanner function. Helical and multisection technique artifacts are produced by the image reconstruction process. Design features incorporated into modern CT scanners minimize some types of artifacts, and some can be partially corrected by the scanner software. However, in many instances, careful patient positioning and optimum selection of scanning parameters are the most important factors in avoiding CT artifacts. (C) RSNA, 2004.