Mitsouras Dimitris, Mulkern Robert V, Owens Christopher D, Conte Michael S, Ersoy Hale, Luu Tuan M, Whitmore Amanda G, Creager Mark A, Rybicki Frank J
Cardiovascular Imaging Section, Department of Radiology, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.
Magn Reson Med. 2008 Mar;59(3):650-4. doi: 10.1002/mrm.21359.
A 3D inner-volume fast spin echo (3D IV-FSE) sequence was developed for ECG-gated, black-blood, T1- and T2-weighted vessel wall imaging of peripheral vein bypass grafts (PVBG). The sequence utilizes nonselective refocusing excitations to minimize echo spacings and a highly selective IV excitation scheme to minimize the need for oversampling of z-encode slice selections. The method was tested in eight PVBG patients who also underwent 2D FSE graft imaging. High-quality 3D imaging was achieved in all subjects, with significant spatial resolution and volume coverage gains compared to the more conventional 2D FSE sequences normalized for signal-to-noise ratios (SNRs) and scan times. Compared to previously proposed 3D IV-FSE methods, nonselective refocusing resulted in a more than 20% FSE echo train sampling efficiency increase while the use of highly selective IV excitation resulted in a 30% improvement in slice oversampling efficiency.
一种三维容积内快速自旋回波（3D IV-FSE）序列被开发用于外周静脉搭桥移植物（PVBG）的心电图门控、黑血、T1加权和T2加权血管壁成像。该序列利用非选择性重聚焦激发来最小化回波间隔，并采用高度选择性的容积内激发方案来最小化z编码层面选择过采样的需求。该方法在8名也接受了二维FSE移植物成像的PVBG患者中进行了测试。所有受试者均获得了高质量的三维成像，与针对信噪比（SNR）和扫描时间进行归一化的更传统二维FSE序列相比，在空间分辨率和容积覆盖方面有显著提高。与先前提出的三维IV-FSE方法相比，非选择性重聚焦使FSE回波链采样效率提高了20%以上，而使用高度选择性的容积内激发使层面过采样效率提高了30%。
