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    Area of Science:

    • Medical imaging physics
    • Biomedical engineering
    • Nanotechnology

    Background:

    • Magnetic particle imaging (MPI) is a developing medical imaging modality.
    • Current MPI systems use sinusoidal excitation, limiting resolution and sensitivity.
    • Pulsed excitation offers potential improvements but faces challenges in signal discrimination and spatial encoding.

    Purpose of the Study:

    • To investigate pulsed excitation strategies for magnetic particle imaging.
    • To overcome limitations in resolution and sensitivity associated with pulsed sequences.
    • To develop a robust system matrix approach for pulsed MPI.

    Main Methods:

    • Utilized an Arbitrary Waveform Magnetic Particle Spectrometer for data acquisition.
    • Implemented a superposition of shifting fields and drive-field rotations for spatial encoding.
    • Employed frequency space image reconstruction from measured particle responses.

    Main Results:

    • Achieved a spatial resolution of 1.0 mT (0.8 mm) in x- and y-directions.
    • Demonstrated superior sensitivity for pulsed sequences compared to conventional methods.
    • Validated a system matrix approach for maintaining resolution with pulsed sequences.

    Conclusions:

    • Pulsed excitation, combined with novel spatial encoding techniques, significantly enhances MPI performance.
    • The proposed methods address key challenges, paving the way for broader medical applications of MPI.
    • This work establishes a foundation for advanced pulsed MPI systems.