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• W2946574471 startingPage "1073" @default.
• W2946574471 abstract "Purpose In this study we propose a method to combine the parallel virtual conjugate coil (VCC) reconstruction with partial Fourier (PF) acquisition to improve reconstruction conditioning and reduce noise amplification in accelerated MRI where PF is used. Methods Accelerated measurements are reconstructed in k‐space by GRAPPA, with a VCC reconstruction kernel trained and applied in the central, symmetrically sampled part of k‐space, while standard reconstruction is performed on the asymmetrically sampled periphery. The two reconstructed regions are merged to form a full reconstructed dataset, followed by PF reconstruction. The method is tested in vivo using T1‐weighted spin‐echo and T2*‐weighted gradient‐echo echo planar imaging (EPI) sequences, using both in‐plane and simultaneous multislice (SMS) acceleration, at 1.5T and 3T field strengths. Noise amplification is estimated with theoretical calculations and pseudo‐multiple‐replica computations, for different PF factors, using zero‐filling, homodyne, and projection onto convex sets (POCS) PF reconstruction. Results Depending on the PF algorithm and the inherent benefit of VCC reconstruction without PF, approximately 35% to 80%, 15% to 60%, and 5% to 30% of that intrinsic SNR gain can be retained for PF factors 7/8, 6/8, and 5/8, respectively, by including the VCC signals in the reconstruction. Compared with VCC‐reconstructed acquisitions of higher acceleration, without PF, but having the same net acceleration, the combined method can provide a higher SNR if the inherent benefit of VCC is low or moderate. Conclusion The proposed technique enables the partial application of VCC reconstruction to measurements with PF using either in‐plane or SMS acceleration, and therefore can reduce the noise amplification of such acquisitions." @default.
• W2946574471 created "2019-05-29" @default.
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• W2946574471 date "2019-05-13" @default.
• W2946574471 modified "2023-10-06" @default.
• W2946574471 title "Full utilization of conjugate symmetry: combining virtual conjugate coil reconstruction with partial Fourier imaging for g‐factor reduction in accelerated MRI" @default.
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• W2946574471 doi "https://doi.org/10.1002/mrm.27799" @default.
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