Real-time cardiac MRI with radial acquisition and k-space variant reduced-FOV reconstruction

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 radia...

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Bibliographic Details
Published in:Magnetic resonance imaging 2018-11, Vol.53, p.98-104
Main Authors: Li, Yu Y., Rashid, Shams, Cheng, Yang J., Schapiro, William, Gliganic, Kathleen, Yamashita, Ann-Marie, Tang, John, Grgas, Marie, Mendez, Michelle, Haag, Elizabeth, Pang, Jianing, Stoeckel, Bernd, Leidecker, Christianne, Cao, J. Jane
Format: Article
Language:English
Subjects:
Correlation function
Correlation imaging
High-speed MRI
Parallel imaging
Real-time imaging
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Summary: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 ~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.
ISSN:0730-725X
1873-5894
DOI:10.1016/j.mri.2018.07.008