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首页> 外文期刊>Magnetic resonance imaging: An International journal of basic research and clinical applications >Real-time cardiac MRI with radial acquisition and k-space variant reduced-FOV reconstruction
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Real-time cardiac MRI with radial acquisition and k-space variant reduced-FOV reconstruction

机译：具有径向采集和K空间变异减少FOV重建的实时心脏MRI

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摘要

This work aims to demonstrate that radial acquisition with k-space variant reduced-FOV reconstruction can enable real-time cardiac MRI with an affordable computation cost. Due to non-uniform sampling, radial imaging requires k-space variant reconstruction for optimal performance. By converting radial parallel imaging reconstruction into the estimation of correlation functions with a previously-developed correlation imaging framework, Cartesian k-space may be reconstructed point-wisely based on parallel imaging relationship between every Cartesian datum and its neighboring radial samples. Furthermore, reduced-FOV correlation functions may be used to calculate a subset of Cartesian k-space data for image reconstruction within a small region of interest, making it possible to run real-time cardiac MRI with an affordable computation cost. In a stress cardiac test where the subject is imaged during biking with a heart rate of 100 bpm, this k-space variant reduced-FOV reconstruction is demonstrated in reference to several radial imaging techniques including gridding, GROG and SPIRiT. It is found that the k-space variant reconstruction outperforms gridding, GROG and SPIRIT in real-time imaging. The computation cost of reduced-FOV reconstruction is similar to 2 times higher than that of GROG. The presented work provides a practical solution to real-time cardiac MRI with radial acquisition and k-space variant reduced-FOV reconstruction in clinical settings.
机译：这项工作旨在证明具有K - 空间变体的径向采集减少FOV重建可以实现具有实惠的计算成本的实时心脏MRI。由于采样不均匀，径向成像需要k空间变体重建以获得最佳性能。通过将径向并行成像重建转换为具有先前显影的相关成像框架的相关函数的估计，可以基于每个笛卡尔基数据和其相邻的径向样本之间的并行成像关系来重建笛卡尔k空间。此外，减少的FOV相关函数可用于计算在感兴趣的小区域内进行图像重建的笛卡尔k空间数据的子集，使得可以以经济实惠的计算成本运行实时心动MRI。在压力心脏试验中，在骑自行车期间对受试者以心率的心率造成＆ 100 bpm，参考几种径向成像技术，包括网格，革歌和精神的几种径向成像技术，证明了这款k空间变体减少的FOV重建。结果发现，K空间变体重建优于网格，革旧和精神在实时成像。减少FOV重建的计算成本与GROG高的2倍相似。所呈现的作品为实时心脏MRI提供了实际解决方案，临床环境中的径向采集和K空间变异减少FOV重建。

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