.png){kind=icon}
返回
Optimized Parallel Imaging for Dynamic PC-MRI with Multidirectional Velocity Encoding
.png){kind=icon}
PRE
AI
DOI：10.1002/mrm.22432.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Phase contrast MRI with multidirectional velocity encoding requires multiple acquisitions of the same k-space lines to encode the underlying velocities, which can considerably lengthen the total scan time. To reduce scan time, parallel imaging is often applied. In dynamic phase contrast MRI using standard generalized autocalibrating partially parallel acquisitions (GRAPPA), several central k-spaces for autocalibration of the reconstruction (autocalibrating signal lines (ACS)) are typically acquired, separately for each velocity direction and each cardiac timeframe, for calculating the reconstruction weights. To further accelerate data acquisition, we developed two methods, which calculated weights with a substantially reduced number of ACSI lines. The effects on image quality and flow quantification were compared to fully sampled data, standard GRAPPA, and time-interleaved sampling scheme in combination with generalized autocalibrating partially parallel acquisitions (TGRAPPA). The results show that the two proposed methods can clearly improve scan efficiency while maintaining image quality and accuracy of measured flow or myocardial tissue velocities. Compared to TGRAPPA, the proposed methods were more accurate in evaluating flow velocity. In conclusion, the proposed reconstruction strategies are promising for dynamic multidirectionally encoded acquisitions and can easily be implemented using the standard GRAPPA reconstruction algorithm. Magn Reson Med 64:472-480, 2010. (C) 2010 Wiley-Liss, Inc.
Keyword:
parallel imaging
undersampling
GRAPPA
dynamic phase contrast imaging
velocity
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
3
论文数:
1.2W
被引数:
3.1W
机构
引用论文
.png){kind=icon}
k-t BLAST and k-t SENSE:: Dynamic MRI with high frame rate exploiting spatiotemporal correlations
OAAI
OAAI分享收藏Dynamic autocalibrated parallel imaging using temporal GRAPPA (TGRAPPA)使用时间GRAPPA (TGRAPPA) 的动态自动校准并行成像
OAAI
OAAI分享收藏Simultaneous acquisition of spatial harmonics (SMASH): Fast imaging with radiofrequency coil arrays同时采集空间谐波 (SMASH): 使用射频线圈阵列进行快速成像
PREAI
分享收藏
查看更多内容