Shared velocity encoding: a method to improve the temporal resolution of phase-contrast velocity measurements.
Shared velocity encoding: a method to improve the temporal resolution of phase-contrast velocity measurements.
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DOI：
10.1002/mrm.23273
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发表时间：
2012-09
影响因子：
3.3
通讯作者：
Simonetti, Orlando P.
中科院分区：
文献类型：
--
作者：
Lin, Hung-Yu;Bender, Jacob A.;Ding, Yu;Chung, Yiu-Cho;Hinton, Alice M.;Pennell, Michael L.;Whitehead, Kevin K.;Raman, Subha V.;Simonetti, Orlando P.
相位对比磁共振成像（PC-MRI）通常用于测量各种临床应用中的流体和组织速度。PC-MRI方法需要采集额外的数据以实现相位差重建，这使得实时成像成为问题。共享速度编码（SVE），一种旨在提高PC-MRI的有效时间分辨率的方法，在具有分段回波平面读出的实时脉冲序列中实现。在计算机模拟中研究了SVE对峰值速度测量的影响，并在流动体模和志愿者中测量了峰值速度和总流量，并与常规ECG触发的分段k空间相位对比序列作为参考标准进行了比较。计算机模拟表明，SVE的峰值速度误差从8.8%减少到5.6%，减少了36%。在脉动流体模中，峰值速度误差也减少了40%。在体模和志愿者中，在有或没有SVE的情况下测量的体积流量没有显著差异。在志愿者中使用SVE进行的峰值速度测量显示出与参考标准的一致性相关性（0.96）高于非SVE（0.87）。SVE重建的有效时间分辨率的改善对实时PC-MRI峰值速度测量的精度和准确性有积极的影响。
Phase contrast magnetic resonance imaging (PC-MRI) is used routinely to measure fluid and tissue velocity with a variety of clinical applications. PC-MRI methods require acquisition of additional data to enable phase difference reconstruction, making real-time imaging problematic. Shared Velocity Encoding (SVE), a method devised to improve the effective temporal resolution of PC-MRI, was implemented in a real-time pulse sequence with segmented echo planar readout. The effect of SVE on peak velocity measurement was investigated in computer simulation, and peak velocities and total flow were measured in a flow phantom and in volunteers and compared with a conventional ECG-triggered, segmented k-space phase-contrast sequence as a reference standard. Computer simulation showed a 36% reduction in peak velocity error from 8.8% to 5.6% with SVE. A similar reduction of 40% in peak velocity error was shown in a pulsatile flow phantom. In the phantom and volunteers, volume flow did not differ significantly when measured with or without SVE. Peak velocity measurements made in the volunteers using SVE showed a higher concordance correlation (0.96) with the reference standard than non-SVE (0.87). The improvement in effective temporal resolution with SVE reconstruction has a positive impact on the precision and accuracy of real-time PC-MRI peak velocity measurements.
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影响因子：
2
作者：
King, Tonya S.;Chinchilli, Vernon M.;Carrasco, Josep L.
通讯作者：
Carrasco, Josep L.
影响因子：
37.8
作者：
Körperich, H;Gieseke, J;Beerbaum, P
通讯作者：
Beerbaum, P
影响因子：
3.3
作者：
Breuer, FA;Kellman, P;Jakob, PM
通讯作者：
Jakob, PM
影响因子：
3.3
作者：
Davis, CP;Liu, PF;Debatin, JF
通讯作者：
Debatin, JF
影响因子：
3.3
作者：
GATEHOUSE, PD;FIRMIN, DN;LONGMORE, DB
通讯作者：
LONGMORE, DB