REAL-TIME FLOOD FLOW IMAGING BY SPIRAL SCAN PHASE-VELOCITY MAPPING
REAL-TIME FLOOD FLOW IMAGING BY SPIRAL SCAN PHASE-VELOCITY MAPPING
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DOI：
10.1002/mrm.1910310506
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发表时间：
1994-05-01
影响因子：
3.3
通讯作者：
LONGMORE, DB
中科院分区：
文献类型：
--
作者：
GATEHOUSE, PD;FIRMIN, DN;LONGMORE, DB
这项工作描述了一种新的序列的开发，该序列使用快速螺旋k空间采样，结合相速度映射，用于实时流速成像。在穿透平面和平面内流动的模型上评估了该技术的性能。流量测量与使用水桶和秒表测量的结果相比，效果很好。该技术的一个优点是，由于早期获取k-空间数据的中心，与流相关的信号损失最小。观察到平面内流动的流动伪影，并借助计算机模拟来理解这些伪影。活体研究涉及正常志愿者的电影速度图；螺旋扫描在两个心跳周期中获得的主动脉血流波形与传统梯度回波序列的数据进行了很好的比较。通过研究运动对主动脉血流的响应和瓣膜动作过程中动脉血流的实时监测，展示了该方法的潜在应用。
The work describes the development of a novel sequence that uses rapid spiral k-space sampling, combined with phase velocity mapping, for real time flow velocity imaging. The performance of the technique is assessed on phantoms for both through-plane and in-plane flows. The flow measurements compared well with those measured using a bucket and stopwatch. One advantage of the technique is that flow related signal loss is minimal due to the early acquisition of the center of k-space data. Flow artifacts were observed for in-plane flow and these were understood with the aid of computer simulations. In vivo studies involved cine velocity mapping in normal volunteers; aortic blood flow waveforms acquired by spiral scanning in two cardiac cycles compared well with data from a conventional gradient-echo sequence. Potential applications of the method are demonstrated by studying the response of aortic flow to physical exercise and the real time monitoring of aortic flow during a valsalver maneuver.