| Autor: |
Willig-Onwuachi JD; Departments of Radiology and Biomedical Engineering, University of California Davis, CA, USA. jwillig@ucdavis.edu, Yeh EN, Grant AK, Ohliger MA, McKenzie CA, Sodickson DK |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of magnetic resonance (San Diego, Calif. : 1997) [J Magn Reson] 2005 Oct; Vol. 176 (2), pp. 187-98. |
| DOI: |
10.1016/j.jmr.2005.06.004 |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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