Wideband SSFP: Alternating repetition time balanced steady state free precession with increased band spacing
Wideband SSFP: Alternating repetition time balanced steady state free precession with increased band spacing
复制标题
DOI：
10.1002/mrm.21296
复制
发表时间：
2007-11-01
影响因子：
3.3
通讯作者：
Hu, Bob S.
中科院分区：
文献类型：
--
作者：
Nayak, Krishna S.;Lee, Hsu-Lei;Hu, Bob S.
平衡稳态自由进动（SSFP）成像受到非共振带伪影的限制，这些伪影在频谱中以1/TR的周期出现。描述了一种新的平衡SSFP技术，用于扩大频率响应中的频带间距。这种方法被称为宽带SSFP，利用交替RF相位的两次交替重复次数，并保持高信噪比和T-2/T-1对比度。对于固定的带间距，该方法可以提高空间分辨率，与传统的SSFP相比，对于固定的读出持续时间，该方法可以扩大带间距，并可能避免传统SSFP中的带伪影。通过仿真和模拟实验对该方法进行了分析，并将其应用于心脏成像和3T高分辨率膝关节成像中条带伪影的降低。
Balanced steady-state free precession (SSFP) imaging is limited by off-resonance banding artifacts, which occur with periodicity 1/TR in the frequency spectrum. A novel balanced SSFP technique for widening the band spacing in the frequency response is described. This method, called wideband SSFP, utilizes two alternating repetition times with alternating RF phase, and maintains high SNR and T-2/T-1 contrast. For a fixed band spacing, this method can enable improvements in spatial resolution compared to conventional SSFP Alternatively, for a fixed readout duration this method can widen the band spacing, and potentially avoid the banding artifacts in conventional SSFP. The method is analyzed using simulations and phantom experiments, and is applied to the reduction of banding artifacts in cine cardiac imaging and high-resolution knee imaging at 3T.