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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Published on: December 18, 2016

An insertable nonlinear gradient coil for phase compensation in SEA imaging.

John C Bosshard, Mary Preston McDougall, Steven M Wright

    IEEE Transactions on Bio-Medical Engineering
    |January 15, 2013
    PubMed
    Summary
    This summary is machine-generated.

    A novel nonlinear gradient coil improves magnetic resonance imaging by compensating for radiofrequency (RF) coil phase variations. This enables simultaneous single echo acquisition (SEA) imaging from dual-sided arrays, enhancing multi-slice imaging efficiency.

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    Three-Dimensional Phase Resolved Functional Lung Magnetic Resonance Imaging
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    Area of Science:

    • Magnetic Resonance Imaging (MRI)
    • Medical Physics
    • Coil Engineering

    Background:

    • Signal cancellation occurs in array coil MRI when radiofrequency (RF) coil dimensions approach voxel dimensions, caused by phase gradients from the coil's magnetic field pattern.
    • Existing single echo acquisition (SEA) phase compensation methods are slice-specific due to RF coil phase variations with distance and dual-sided array reversals.

    Purpose of the Study:

    • To develop and implement a nonlinear gradient coil for spatially varying phase compensation in array coil MRI.
    • To overcome the limitations of single-slice optimization in current phase compensation techniques for dual-sided arrays.

    Main Methods:

    • Implementation of a custom nonlinear gradient coil designed for spatially varying phase compensation.
    • Application of a single phase compensation pulse to address coil phase variations across multiple slices.
    • Utilizing dual-sided receive arrays with narrow coils for simultaneous imaging.

    Main Results:

    • The nonlinear gradient coil effectively offsets coil phase variations with slice position.
    • A single phase compensation pulse successfully enabled imaging across multiple slices within a slab.
    • Demonstrated simultaneous SEA imaging from opposite sides of a sample using a dual-sided receive array.

    Conclusions:

    • The developed nonlinear gradient coil provides efficient, spatially varying phase compensation for array coil MRI.
    • This approach significantly enhances the efficiency of multi-slice imaging and enables simultaneous dual-sided acquisition.
    • The method offers a practical solution for reducing signal cancellation and improving image quality in advanced MRI techniques.