Liu K, Rutt B K
The John P. Robarts Research Institute and Department of Diagnostic Radiology and Nuclear Medicine, University of Western Ontario, London, Canada.
J Magn Reson Imaging. 1998 Jul-Aug;8(4):903-11. doi: 10.1002/jmri.1880080421.
This work addresses the elimination of the slab boundary artifact (SBA) or venetian blind artifact in three-dimensional multiple overlapped thin slab acquisition (3D MOTSA) for magnetic resonance angiography (MRA). Our method uses a sliding-slab, interleaved kY (SLINKY) data acquisition strategy, equalizing flow-related signal intensity weighting across the entire slab dimension. This technique demodulates signal intensity changes along the slab direction and can essentially eliminate the SBA while retaining the same or better imaging time efficiency than that of conventional MOTSA, providing robustness to complicated flow patterns and thereby resulting in more accurate depiction of vascular morphology. In addition, this technique does not need specialized reconstruction and extra computation. The unique penalty of this technique is the sensitivity to phase inconsistency in the data. Both phantom and in vivo experiments verify the clinical significance of the technique. The new MRA images acquired with this imaging technique show highly reliable mapping of vascular morphology without the SBA and reduction of signal voids in complex/slow flow regions.
这项工作致力于消除磁共振血管造影（MRA）中三维多重重叠薄层采集（3D MOTSA）中的板层边界伪影（SBA）或百叶窗伪影。我们的方法采用滑动板层、交错kY（SLINKY）数据采集策略，在整个板层维度上均衡与血流相关的信号强度加权。该技术解调沿板层方向的信号强度变化，并且在保持与传统MOTSA相同或更好的成像时间效率的同时，基本上可以消除SBA，对复杂的血流模式具有鲁棒性，从而能够更准确地描绘血管形态。此外，该技术不需要专门的重建和额外的计算。该技术唯一的不利之处是对数据中的相位不一致敏感。体模实验和体内实验均验证了该技术的临床意义。用这种成像技术获取的新MRA图像显示出高度可靠的血管形态映射，没有SBA，并且减少了复杂/缓慢血流区域中的信号缺失。
