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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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Optimization of Coil Element Configurations for a Matrix Gradient Coil.

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    Reducing amplifiers for matrix gradient coils is feasible. This simulation shows an 84-channel coil can generate diverse fields with fewer amplifiers, lowering costs and increasing practical use in MRI.

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    Area of Science:

    • Magnetic Resonance Imaging (MRI)
    • Coil Engineering

    Background:

    • Matrix gradient coils offer advanced imaging and B0 shimming capabilities with numerous coil elements.
    • High costs and technical complexity limit the use of one amplifier per coil element in imaging applications.

    Purpose of the Study:

    • To investigate the feasibility of reducing the number of amplifiers for an 84-channel matrix gradient coil in brain imaging.
    • To demonstrate that a reduced amplifier count can still achieve desired field shapes for MRI applications.

    Main Methods:

    • A simulation study using an 84-channel matrix gradient coil (head insert).
    • An optimization algorithm grouped coil elements to be driven by a limited number of amplifiers.
    • Simulated annealing was employed to solve the combinatorial optimization problem.
    • Target fields included spherical harmonics up to third order within a 20-cm diameter sphere.

    Main Results:

    • An 84-channel matrix gradient coil can create various field shapes with a reduced number of amplifiers.
    • A median normalized least squares error below 5% was achieved with 12 or more amplifiers.
    • Dissipated power remained within reasonable limits.
    • Sequential generation of spherical harmonics up to third order is possible with a small amplifier set and switches.

    Conclusions:

    • Reducing the number of amplifiers for matrix gradient coils is a viable strategy.
    • This approach significantly lowers the cost and enhances the practical utility of matrix gradient coils for MRI.
    • The findings support the wider adoption of advanced gradient coil technology in clinical settings.