Kobayashi S, Kumai T, Sekiya M, Imazeki Y, Watanabe S, Masuda Y, Inagaki Y, Hashimoto T, Ikehira H, Tateno Y
Third Department of Internal Medicine, Chiba University School of Medicine.
J Cardiol. 1993;23(3):269-75.
The blood flow in aortic aneurysms and dissections was evaluated using cine MR imaging which depicts turbulent blood flow as a signal loss within a high-intensity blood pool or flowing blood. Six patients with 8 aortic aneurysms ranging 38 to 70 mm in diameter, and 16 patients with aortic dissections were imaged with a 0.5 or 1.5 T superconducting magnet using an ECG-gated fast field echo technique. Circulating flows were observed in 3 of 8 aortic aneurysms. This suggests that turbulent blood flow did not occur prominently in the relatively small aortic aneurysms imaged in this study. The false lumens were thrombosed in 2 of 16 aortic dissections. In 13 of the remaining 14 dissections jet flows were observed through the entry into the false lumen. In 2 of these cases the jet flows moved to and fro through the entry. The entry was not detected in a small abdominal aortic dissection. Re-entry was seen in one case. Using a spin-echo imaging technique, the entry can be diagnosed by detecting the interruption of the intimal flap and the flow void within the false lumen. However, the entry was more clearly depicted and the direction of blood flow better determined by cine MR imaging compared with the conventional spin-echo imaging technique. Cine MR imaging provides useful information about the blood flow in aortic aneurysms and dissections noninvasively.
使用电影磁共振成像（cine MR imaging）评估主动脉瘤和主动脉夹层中的血流情况，该技术将湍流描绘为高强度血池或流动血液内的信号缺失。对8例直径为38至70毫米的主动脉瘤患者和16例主动脉夹层患者，采用0.5或1.5T超导磁体，运用心电图门控快速场回波技术进行成像。8例主动脉瘤中有3例观察到循环血流。这表明在本研究中成像的相对较小的主动脉瘤中，湍流并未显著发生。16例主动脉夹层中有2例假腔血栓形成。在其余14例夹层中的13例中，观察到通过破口进入假腔的喷射血流。其中2例喷射血流在破口处来回移动。在一个小的腹主动脉夹层中未检测到破口。有1例观察到再破口。使用自旋回波成像技术，通过检测内膜瓣的中断和假腔内的血流空洞可诊断破口。然而，与传统自旋回波成像技术相比，电影磁共振成像能更清晰地描绘破口并更好地确定血流方向。电影磁共振成像能无创地提供有关主动脉瘤和主动脉夹层血流的有用信息。
