IEEE Trans Med Imaging. 2018 Jul;37(7):1632-1640. doi: 10.1109/TMI.2018.2789923.
In this paper, we propose a new 3-D dual-echo method for simultaneous multislab time-of-flight MR angiography (TOF MRA) and single-slab susceptibility-weighted imaging (SWI). The previous echo-specific k-space reordering scheme for compatible dual-echo arteriovenography (CODEA) was advanced to applying excitation RF pulses for multiple thin slabs and a single thick slab to the first (TOF MRA) and second (SWI) echoes, respectively. Single-slab CODEA and multislab CODEA (fixed-slab CODEAs) were additionally acquired as comparison reference to the proposed variable-slab CODEA. Parallel imaging was also tested for feasibility of accelerating the proposed method. TOF MRA and SWI from the proposed variable-slab CODEA were visually and quantitatively comparable to multislab TOF MRA and single-slab SWI, respectively, separately acquired from the fixed-slab CODEAs. The parallel imaging reduced the scan time from 10.3 to 5.6 min. Furthermore, the proposed variable-slab approach improved the vessel continuities at slab boundaries of TOF MRA for CODEA as well as for the conventional single echo method. The proposed variable-slab CODEA provided multislab TOF MRA and single-slab SWI simultaneously in a clinically reasonable scan time of ~5 min with minimal impact on image qualities, while suppressing slab boundary artifacts in TOF MRA.
在本文中，我们提出了一种新的三维双回波方法，用于同时进行多层面时间飞越磁共振血管成像（TOF MRA）和单层面磁化率加权成像（SWI）。我们将先前用于兼容双回波动脉血管成像（CODEA）的特定回波的 K 空间重排方案进行了扩展，以便将多个薄层面和一个厚层面的激发 RF 脉冲分别应用于第一回波（TOF MRA）和第二回波（SWI）。另外还获取了单层面 CODEA 和多层面 CODEA（固定层面 CODEA）作为对所提出的可变层面 CODEA 的比较参考。还测试了并行成像以评估加速该方法的可行性。所提出的可变层面 CODEA 的 TOF MRA 和 SWI 在视觉和定量上与分别从固定层面 CODEA 获得的多层面 TOF MRA 和单层面 SWI 相当。并行成像将扫描时间从 10.3 分钟缩短至 5.6 分钟。此外，所提出的可变层面方法改善了 CODEA 以及传统单回波方法的 TOF MRA 层面边界处的血管连续性。所提出的可变层面 CODEA 在大约 5 分钟的临床合理扫描时间内同时提供多层面 TOF MRA 和单层面 SWI，对图像质量的影响最小，同时抑制了 TOF MRA 中的层面边界伪影。
