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- W2896862643 abstract "Highly accelerated B 1+ -mapping based on the Bloch-Siegert shift to allow 3D acquisitions even within a brief period of a single breath-hold.The B 1+ dependent Bloch-Siegert phase shift is measured within a highly subsampled 3D-volume and reconstructed using a two-step variational approach, exploiting the different spatial distribution of morphology and B 1+ -field. By appropriate variable substitution the basic non-convex optimization problem is transformed in a sequential solution of two convex optimization problems with a total generalized variation (TGV) regularization for the morphology part and a smoothness constraint for the B 1+ -field. The method is evaluated on 3D in vivo data with retro- and prospective subsampling. The reconstructed B 1+ -maps are compared to a zero-padded low resolution reconstruction and a fully sampled reference.The reconstructed B 1+ -field maps are in high accordance to the reference for all measurements with a mean error below 1% and a maximum of about 4% for acceleration factors up to 100. The minimal error for different sampling patterns was achieved by sampling a dense region in k-space center with acquisition times of around 10-12 s for 3D-acquistions.The proposed variational approach enables highly accelerated 3D acquisitions of Bloch-Siegert data and thus full liver coverage in a single breath hold." @default.
- W2896862643 created "2018-10-26" @default.
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- W2896862643 date "2018-10-12" @default.
- W2896862643 modified "2023-10-18" @default.
- W2896862643 title "Ultrafast 3D Bloch–Siegert B‐mapping using variational modeling" @default.
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- W2896862643 doi "https://doi.org/10.1002/mrm.27434" @default.
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