Cerebral MR angiography with multiple overlapping thin slab acquisition. Part I. Quantitative analysis of vessel visibility.
Cerebral MR angiography with multiple overlapping thin slab acquisition. Part I. Quantitative analysis of vessel visibility.
复制标题
具有多个重叠薄板采集的脑 MR 血管造影。
作者：
D. Blatter;D. Parker;R. Robison
多重重叠薄层采集（MOTSA）是一种新的飞行时间磁共振（MR）血管造影技术，结合了多节段二维和直接三维容积方法的许多优点。为了严格评价MOTSA磁共振血管造影可获得的血管细节，作者量化了颅内动脉节段的可见性频率，并将其可见性与血管尺寸（如在切片血管造影中测量的）以及动脉节段的位置和方向相关联。直径至少为0.9 mm（当前应用中使用的体素尺寸）的颅内动脉节段使用MOTSA技术始终可视化。当体素尺寸减小时，可视化的小血管的分数得到改善。与最大强度投影（MIP）图像相比，原始图像的可见性明显更好。板层顶部饱和和导致的血管强度降低很少发生，并且不会导致轴向图像中的明显图像退化。
Multiple overlapping thin slab acquisition (MOTSA) is a novel time-of-flight magnetic resonance (MR) angiography technique that combines many of the advantages of multiple-section two-dimensional and direct three-dimensional volume methods. To rigorously evaluate the vascular detail that can be obtained with MOTSA MR angiography, the authors have quantified the frequency of visibility of intracranial arterial segments and have correlated their visibility with vessel size as measured at cut-film angiography and with the position and orientation of the arterial segment. Intracranial arterial segments at least 0.9 mm in diameter (the voxel dimension used in the current application) are consistently visualized with the MOTSA technique. The fraction of small vessels visualized is improved when voxel dimensions are reduced. Visibility is noticeably better in the primary images compared with the maximum-intensity-projection (MIP) images. Top-of-slab saturation and resulting decreased vessel intensity occurred infrequently and did not result in marked image degradation in the axial images.