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Ultrafast 3D Ultrasound Localization Microscopy Using a 32 × 32 Matrix Array.

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    This study introduces 3D ultrafast ultrasound localization microscopy (ULM) for high-resolution blood vessel mapping. The new method overcomes limitations of 2D ULM, enabling faster, volumetric imaging of complex vascular structures.

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    Area of Science:

    • Medical Imaging
    • Biomedical Engineering
    • Ultrasound Technology

    Background:

    • Ultrasound localization microscopy (ULM) maps microvasculature with sub-wavelength resolution.
    • Current ULM is limited to 2D or small 3D fields of view, suffering from long acquisition times and motion artifacts.

    Purpose of the Study:

    • To develop and demonstrate 3D ultrafast ultrasound localization microscopy (ULM) for volumetric imaging.
    • To overcome the limitations of existing 2D ULM techniques.

    Main Methods:

    • Utilized 4D ultrafast ultrasound imaging with a 9-MHz matrix-array probe and a 1024-channel scanner.
    • Developed novel deconvolution algorithms for 3D microbubble localization and tracking.
    • Employed Munkres assignment for particle pairing and Lagrangian approach for velocimetry.

    Main Results:

    • Achieved sub-wavelength volumetric imaging of a complex 3D vascular structure (branched canals).
    • Resolved fine details with canal edge delineation as small as [Formula: see text] and spacing as low as [Formula: see text].
    • Enabled volumetric imaging at 500 Hz, capturing velocities from 2.5-150 mm/s within a 12-second acquisition time.

    Conclusions:

    • Demonstrated the feasibility of in vitro 3D ultrafast ultrasound localization microscopy.
    • Paved the way for future in vivo volumetric ULM applications.