Phase-constrained parallel MR image reconstruction |
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Authors: | Willig-Onwuachi Jacob D Yeh Ernest N Grant Aaron K Ohliger Michael A McKenzie Charles A Sodickson Daniel K |
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Institution: | Departments of Radiology and Biomedical Engineering, University of California Davis, CA, USA. jwillig@ucdavis.edu |
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Abstract: | A generalized method for phase-constrained parallel MR image reconstruction is presented that combines and extends the concepts of partial-Fourier reconstruction and parallel imaging. It provides a framework for reconstructing images employing either or both techniques and for comparing image quality achieved by varying k-space sampling schemes. The method can be used as a parallel image reconstruction with a partial-Fourier reconstruction built in. It can also be used with trajectories not readily handled by straightforward combinations of partial-Fourier and SENSE-like parallel reconstructions, including variable-density, and non-Cartesian trajectories. The phase constraint specifies a better-conditioned inverse problem compared to unconstrained parallel MR reconstruction alone. This phase-constrained parallel MRI reconstruction offers a one-step alternative to the standard combination of homodyne and SENSE reconstructions with the added benefit of flexibility of sampling trajectory. The theory of the phase-constrained approach is outlined, and its calibration requirements and limitations are discussed. Simulations, phantom experiments, and in vivo experiments are presented. |
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Keywords: | Parallel imaging Partial-Fourier Constrained reconstruction Coil arrays |
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