颞骨部分容积平均的临床意义。
Clinical significance of partial volume averaging of the temporal bone.
作者信息
Chakeres D W
出版信息
AJNR Am J Neuroradiol. 1984 May-Jun;5(3):297-302.
Abstract
The effects of partial volume averaging on computed tomographic images of temporal bone structures were evaluated. The models chosen for study included a cadaver stapes, two metallic prosthetic stapes, and a formalin-fixed temporal bone. The studies measured the changes in apparent dimension and Hounsfield units with incremental filling of voxels with metallic densities, changes in the angle of tomographic section in relation to small bony structures, and the effects of soft-tissue silhouetting. The clinical significance of these changes is demonstrated by examples of this phenomenon seen in actual patient examinations. This study confirms that partial volume averaging is one of the primary limitations in resolution of small structures of the temporal bone.
摘要
评估了部分容积平均对颞骨结构计算机断层扫描图像的影响。选择用于研究的模型包括一具尸体镫骨、两个金属人工镫骨以及一个经福尔马林固定的颞骨。这些研究测量了随着体素逐渐填充金属密度时表观尺寸和亨氏单位的变化、断层扫描截面相对于小骨结构的角度变化以及软组织轮廓的影响。通过在实际患者检查中看到的这种现象的实例证明了这些变化的临床意义。本研究证实部分容积平均是颞骨小结构分辨率的主要限制因素之一。
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