Janka R, Fellner F A, Fellner C, Lang W, Requardt M, Wutke R, Bautz W A
Institut für Diagnostische Radiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg.
Rofo. 2000 May;172(5):477-81. doi: 10.1055/s-2000-670.
We introduce a hybrid technique which allows a high resolution MRA of the peripheral arteries with a dedicated phased-array coil using the floating table technique.
Five patients with peripheral arterial occlusive disease were examined within one week with i.a. DSA and MRA using the hybrid technique. MRA examinations were done on a 1.5 T system. At first, pelvic arteries were examined in a single step mode applying the CareBolus technique. Subsequently, thighs and lower legs were examined using the floating table mode. 125 vascular segments were evaluated.
The hybrid technique proved to be robust and could be performed in each case. Mean examination time was about 30 min. For 117 vascular segments no difference was found between i.a. DSA and MRA. Three segments revealed a higher grade of stenosis in DSA than in MRA, five segments were graded higher in MRA than in DSA. Occlusions were visualized identically in both methods. Venous overlap had no relevant effects on image evaluation.
This hybrid technique in combination with phased-array coils allows a high resolution MRA of the peripheral arteries with very good image quality. If future studies confirm reduced venous overlap, this method may be an alternative also for users of the floating table MRA with the body resonator.
我们介绍一种混合技术，该技术使用浮动床技术和专用相控阵线圈实现外周动脉的高分辨率磁共振血管造影（MRA）。
5例外周动脉闭塞性疾病患者在一周内接受了数字减影血管造影（DSA）和使用该混合技术的MRA检查。MRA检查在1.5T系统上进行。首先，采用CareBolus技术以单步模式检查盆腔动脉。随后，使用浮动床模式检查大腿和小腿。共评估了125个血管节段。
混合技术被证明是可靠的，且在每种情况下均可实施。平均检查时间约为30分钟。117个血管节段在DSA和MRA之间未发现差异。3个节段在DSA中的狭窄程度高于MRA，5个节段在MRA中的分级高于DSA。两种方法对闭塞的显示相同。静脉重叠对图像评估无显著影响。
这种混合技术与相控阵线圈相结合可实现外周动脉的高分辨率MRA，图像质量非常好。如果未来的研究证实静脉重叠减少，该方法对于使用体部谐振器的浮动床MRA用户也可能是一种选择。
