伪影是指被扫描物体中并不存在而在图像中却显示出来的各种不同的影像。ＣＴ图像中后颅窝常见各种形态的伪影，其中出现在脑干的伪影一般称之为亨氏暗区，本文旨在分析脑干伪影的形态、密度及产生机制，并予以分类，探讨减少伪影的方法，为放射医生阅ＣＴ片及诊断提供依据... Artifacts refer to various images that do not exist in the scanned object and are displayed in the image. Common artifacts in the posterior fossa of CT images are commonly seen in CT images. The artifacts appearing in the brainstem are generally called Heinz dark areas. This paper aims to analyze the morphology, density and mechanism of brainstem artifacts and classify them. Discuss ways to reduce artifacts and provide radiologists with evidence of CT scanning and diagnosis ...