Accelerating cardiac Cine 3D Imaging using k-t BLAST
Accelerating cardiac Cine 3D Imaging using k-t BLAST
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DOI：
10.1002/mrm.20145
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发表时间：
2004-07-01
影响因子：
3.3
通讯作者：
Boesiger, P
中科院分区：
文献类型：
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作者：
Kozerke, S;Tsao, J;Boesiger, P
通过使用 k-t BLAST 利用心脏采集中的时空相关性，心脏的门控电影 3D 采集速度净加速了 4.3 倍，使得单次屏气采集成为可能。沿着剪切网格图案对 k-t 空间进行稀疏采样被实施到电影 3D SSFP 序列中。解决 k-t BLAST 方法中的混叠问题所需的低分辨率训练数据的采集要么插入采样过程中，要么在单独的预扫描中获得，以缩短心脏病患者的屏气持续时间。体积数据集以 20 个切片覆盖心脏，空间分辨率为 2 x 2 x 5 mm(3)，记录了 20 个心脏相位，总屏气持续时间为 25-27 秒，如果另外采用部分傅立叶采样，则为 18 秒。该方法的可行性在健康志愿者和患者身上得到了证明。将来自 3D 数据集的单切片的心内膜面积与从单独的单切片采集中提取的值进行比较，显示没有显着差异。通过大幅缩短采集时间，k-t BLAST 可以极大地促进心脏的体积成像，以评估局部室壁运动以及评估心室容积和射血分数。 (C) 2004 Wiley-Liss, Inc.
By exploiting spatiotemporal correlations in cardiac acquisitions using k-t BLAST, gated cine 3D acquisitions of the heart were accelerated by a net factor of 4.3, making single breath-hold acquisitions possible. Sparse sampling of k-t space along a sheared grid pattern was implemented into a cine 3D SSFP sequence. The acquisition of low-resolution training data, which was required to resolve aliasing in the k-t BLAST method, was either interleaved into the sampling process or obtained in a separate prescan to allow for shorter breath-hold durations in patients with heart disease. Volumetric datasets covering the heart with 20 slices at a spatial resolution of 2 x 2 x 5 mm(3) were recorded with 20 cardiac phases in a total breathhold duration of 25-27 sec, or 18 sec if partial Fourier sampling was additionally employed. The feasibility of the method was demonstrated on healthy volunteers and on patients. The comparison of endocardial area derived from single slices of the 3D dataset with values extracted from separate single-slice acquisitions showed no significant differences. By shortening the acquisition substantially, k-t BLAST may greatly facilitate volumetric imaging of the heart for evaluation of regional wall motion and the assessment of ventricular volume and ejection fraction. (C) 2004 Wiley-Liss, Inc.