Hayashi H, Kawamata H, Takagi R, Kumazaki T
Department of Radiology, Nippon Medical School.
Nihon Igaku Hoshasen Gakkai Zasshi. 1995 Oct;55(12):845-54.
Seven patients with thrombosed type aortic dissection who underwent both early- and late-phase contrast enhanced (CE)-CT scans were analyzed. The image acquisition of early-phase CE-CT began 30 seconds after the intravenous administration of contrast material at an injection rate of 1.5 ml per second. Late-phase CE-CT began 6 minutes after contrast material injection. The thrombosed false lumens were not enhanced on early-phase CE-CTs in any of the cases. In five of seven cases, on the other hand, false lumens of the descending aorta were enhanced on late-phase images. Late enhancement in the false lumen was roughly divided into two patterns; (1) a crescentic enhancement of the sub-adventitial region (3 cases), and (2) a vague enhancement around the ulcerlike projection (2 cases). The mechanism of late enhancement in the false lumen was not fully elucidated. Although the clinical significance of late enhancement has not yet been established, it will be useful to demonstrate an unstable status of the thrombosed false lumens before organization.
对7例患有血栓形成型主动脉夹层且接受了早期和晚期对比增强（CE）CT扫描的患者进行了分析。早期CE-CT的图像采集在以每秒1.5毫升的注射速率静脉注射造影剂后30秒开始。晚期CE-CT在造影剂注射后6分钟开始。在任何病例中，血栓形成的假腔在早期CE-CT上均未强化。另一方面，在7例中的5例中，降主动脉的假腔在晚期图像上有强化。假腔内的延迟强化大致分为两种模式：（1）外膜下区域的新月形强化（3例），以及（2）溃疡样突出周围的模糊强化（2例）。假腔内延迟强化的机制尚未完全阐明。虽然延迟强化的临床意义尚未确立，但它将有助于在机化前显示血栓形成假腔的不稳定状态。
