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    Area of Science:

    • Medical Imaging
    • Magnetic Resonance Imaging
    • Biomedical Engineering

    Background:

    • Susceptibility-based positive contrast MRI is effective for visualizing small MR-compatible devices.
    • A key limitation of this technique is its prolonged scan duration.
    • Accelerating scan times is crucial for clinical applicability and patient comfort.

    Purpose of the Study:

    • To develop and validate an accelerated susceptibility-based positive contrast MRI method.
    • To enable faster generation of susceptibility maps from undersampled data.
    • To improve the efficiency of imaging small MR-compatible devices.

    Main Methods:

    • Implemented a hybrid k-space approach combining parallel imaging (GRAPPA) and compressive sensing (CS).
    • Acquired undersampled data for susceptibility map generation.
    • Applied the accelerated technique to imaging brachytherapy seeds.

    Main Results:

    • Achieved high-quality 3-D images of brachytherapy seeds.
    • Demonstrated successful acceleration up to a factor of 4.
    • Reduced scan time from 4 minutes to 1.4 minutes.

    Conclusions:

    • The proposed accelerated MRI method significantly shortens scan times while maintaining image quality.
    • This technique offers a practical solution for faster visualization of MR-compatible devices.
    • Further optimization may enhance its utility in clinical settings.