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26 September 2013 Joint image reconstruction and motion parameter estimation for free-breathing navigator-gated cardiac MRI
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Abstract
We propose an acquisition and reconstruction technique for accelerated free-breathing cardiac MRI acquisitions. For the acquisition, a random undersampling pattern, including a fully-sampled center of k-space, is generated prospectively. The k-space lines specified by this undersampling pattern is acquired with respiratory navigating (NAV), where only the central k-space lines are acquired within the prespecified gating window. For the outer k-space lines, if the NAV signal corresponding to a k-space segment is outside the gating window, the segment is rejected, but not re-acquired. The reconstruction approach jointly estimates the underlying image using a compressed-sensing based approach, and the translational motion parameters for each segment for the outer k-space segments acquired outside the gating window. The feasibility of the approach is demonstrated in healthy adult subjects using whole-heart coronary MRI with a 3-fold accelerated random undersampling pattern. The proposed acquisition and reconstruction technique is compared to parallel imaging with uniform undersampling with 3-fold undersampling. The two techniques exhibit similar image quality with a shorter acquisition time for the proposed approach (4:25±0:31 minutes versus 6:52±0:19).
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Mehmet Akçakaya, Tamer A. Basha, Sebastian Weingärtner, and Reza Nezafat "Joint image reconstruction and motion parameter estimation for free-breathing navigator-gated cardiac MRI", Proc. SPIE 8858, Wavelets and Sparsity XV, 885820 (26 September 2013); https://doi.org/10.1117/12.2023787
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