Burns M A, Molina P L, Gutierrez F R, Sagel S S
Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110.
AJR Am J Roentgenol. 1991 Sep;157(3):465-7. doi: 10.2214/ajr.157.3.1872227.
We recently imaged two patients clinically suspected of having aortic dissection whose contrast-enhanced CT examinations, obtained on a new scanner with a 1-sec scanning time, showed findings suggesting an ascending aortic dissection. The subsequent clinical course and evaluation implied that the CT findings were predominantly artifactual. We identified identical artifacts in 18% of 50 consecutive contrast-enhanced CT examinations performed for a variety of indications on the same scanner. The double-lumen artifact, simulating an intimal flap, occurs in the proximal ascending aorta and is limited to one or two contiguous transaxial images. The artifact was not detected on two other CT units. We believe the artifact arises from motion of the aortic wall and the surrounding pericardial recesses during image acquisition.
我们最近对两名临床怀疑患有主动脉夹层的患者进行了成像检查，他们在一台扫描时间为1秒的新型扫描仪上进行的增强CT检查显示，结果提示升主动脉夹层。随后的临床病程和评估表明，CT表现主要是伪影。在同一台扫描仪上，我们对50例因各种适应证进行的连续增强CT检查中的18%发现了相同的伪影。模拟内膜瓣的双腔伪影出现在升主动脉近端，且仅限于一两个相邻的横断面图像。在另外两台CT设备上未检测到该伪影。我们认为该伪影是在图像采集过程中主动脉壁和周围心包隐窝的运动所致。
