Gallagher S, Dixon A K
J Comput Assist Tomogr. 1984 Aug;8(4):688-93. doi: 10.1097/00004728-198408000-00018.
Streak artefacts running across images of the aorta can mimic aortic dissection on CT. We have compared 12 patients suffering from dissection with 45 others. Some artefacts were found in every patient. Such misleading appearances were more obtrusive in dissectors. However, we have found several pointers that help distinguish true intimal flaps from artefacts. Flaps are usually thin structures showing mild curvature. Artefacts are generally linear and vary in thickness. Their orientation may change markedly from one CT section to the next; they frequently extend beyond the confines of the aorta. In the ascending aorta, artefacts usually run at an angle of approximately 66 degrees to the coronal plane; especial care should be taken before diagnosing a straight intimal flap in that orientation. Careful study of images on the monitor rather than on film is a further help in the important distinction between artefact and intimal flap.
贯穿主动脉图像的条纹伪影在CT上可能会被误诊为主动脉夹层。我们将12例主动脉夹层患者与另外45例患者进行了比较。在每例患者中均发现了一些伪影。此类误导性表现多见于夹层患者。然而，我们发现了一些有助于区分真正内膜瓣与伪影的线索。内膜瓣通常为薄结构，呈轻度弯曲。伪影一般呈线性，厚度各异。其方向在不同CT层面可能会有明显变化；它们常常延伸至主动脉范围之外。在升主动脉，伪影通常与冠状面呈约66度角；在此方向诊断笔直的内膜瓣时应格外小心。仔细研究显示器上而非胶片上的图像，有助于进一步区分伪影与内膜瓣。
