Lewin J S, Laub G, Hausmann R
Department of Radiology, University Hospitals of Cleveland, Case Western Reserve University, OH 44106.
Radiology. 1991 Apr;179(1):261-4. doi: 10.1148/radiology.179.1.2006288.
The application of three-dimensional (3D) time-of-flight (TOF) magnetic resonance (MR) angiographic techniques to the vasculature of the abdomen and thorax has not, to the authors' knowledge, been previously reported; this is possibly due to the large amount of physiologic motion in these regions along with the anticipated sensitivity of the 3D acquisition scheme to image degradation caused by motion artifact. The authors describe an asymmetric short-echo velocity-compensated 3D TOF technique that minimized the effects of physiologic motion on image quality and provided rapid high-resolution 3D MR arteriograms of the abdomen and thorax. Contiguous 3D volumes were often combined to provide sufficient anatomic coverage. Benefits include high spatial resolution and minimization of signal loss; limitations include sensitivity to motion artifact and progressive spin saturation.
据作者所知，三维（3D）飞行时间（TOF）磁共振（MR）血管造影技术在腹部和胸部血管系统中的应用此前尚未见报道；这可能是由于这些区域存在大量生理运动，以及3D采集方案预期对由运动伪影导致的图像退化较为敏感。作者描述了一种非对称短回波速度补偿3D TOF技术，该技术可将生理运动对图像质量的影响降至最低，并提供腹部和胸部快速高分辨率的3D MR动脉造影。相邻的3D容积常被组合起来以提供足够的解剖覆盖范围。优点包括高空间分辨率和信号损失最小化；局限性包括对运动伪影敏感和渐进性自旋饱和。
