Reducing view-sharing using compressed sensing in time-resolved contrast-enhanced magnetic resonance angiography
Reducing view-sharing using compressed sensing in time-resolved contrast-enhanced magnetic resonance angiography
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DOI：
10.1002/mrm.25414
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发表时间：
2015-08-01
影响因子：
3.3
通讯作者：
Hu, Peng
中科院分区：
文献类型：
--
作者：
Rapacchi, Stanislas;Natsuaki, Yutaka;Hu, Peng
PurposeTo研究时间分辨MR血管造影（MRA）中k空间视图共享的时间和空间模糊伪影，并提出一种减少这些伪影的技术。MethodsWe使用三维时间分辨MRA视图共享序列采集k空间数据集，并回顾性地将其重新格式化为两个重建框架：通过具有随机轨迹的时间分辨成像（TWIST）和最小k空间视图共享和压缩感知（CS-TWIST）的全视图共享。这两个成像系列在时间足迹上不同，但在时间帧速率上没有差异。结果CS-TWIST能将图像时间足迹减少2 ~ 3倍，且CS-TWIST的总体主观图像质量高于TWIST（P
PurposeTo study temporal and spatial blurring artifacts from k-space view-sharing in time-resolved MR angiography (MRA) and to propose a technique for reducing these artifacts.MethodsWe acquired k-space data sets using a three-dimensional time-resolved MRA view-sharing sequence and retrospectively reformatted them into two reconstruction frameworks: full view-sharing via time-resolved imaging with stochastic trajectories (TWIST) and minimal k-space view-sharing and compressed sensing (CS-TWIST). The two imaging series differed in temporal footprint but not in temporal frame rate. The artifacts from view-sharing were compared qualitatively and quantitatively in nine patients in addition to a phantom experiment.ResultsCS-TWIST was able to reduce the imaging temporal footprint by two- to three-fold compared with TWIST, and the overall subjective image quality of CS-TWIST was higher than that for TWIST (P