Lehr J L
AJR Am J Roentgenol. 1983 Jul;141(1):183-91. doi: 10.2214/ajr.141.1.183.
A truncated-view artifact in CT is produced whenever any part of the patient or imaged object is present in some but not all of the views obtained for a slice. The potential to create images with this artifact exists for any CT scanner in which the fan beam (or its equivalent) does not cover the entire gantry aperture. This includes most CT systems currently on the market. Although the artifact may not create a severe visual disturbance in the image, it can alter the CT numbers in a manner that will compromise the accuracy of quantitative analyses. This report describes the nature of the truncated-view artifact and presents simulated examples for both mathematical phantoms and clinical scans. The artifact can be eliminated by assuring that the entire patient and all foreign objects are included in the field of view, or it can be minimized by placing objects that cannot be entirely within the field of view as close to the edge of the gantry aperture as possible.
只要患者或成像对象的任何部分存在于为某一层面获取的部分而非全部视图中，CT 就会产生截断视图伪影。对于任何扇形束（或其等效物）未覆盖整个机架孔径的 CT 扫描仪，都有可能产生带有这种伪影的图像。这包括目前市场上的大多数 CT 系统。尽管该伪影可能不会在图像中造成严重的视觉干扰，但它会以一种损害定量分析准确性的方式改变 CT 数值。本报告描述了截断视图伪影的性质，并给出了数学模型和临床扫描的模拟示例。通过确保整个患者和所有异物都包含在视野范围内，可以消除该伪影；或者通过将无法完全置于视野范围内的物体尽可能靠近机架孔径边缘放置，可以将其最小化。
