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    Area of Science:

    • Ultrasound imaging
    • Medical physics
    • Signal processing

    Background:

    • Conventional focused ultrasound imaging uses transmit apodization to shape the ultrasound beam.
    • Coherent plane-wave compounding (CPWC) offers advantages in ultrasound imaging speed and quality.
    • Understanding the relationship between apodization in these methods is crucial for optimizing ultrasound beamforming.

    Discussion:

    • This study explores the mathematical relationship between apodization in conventional focused imaging and CPWC.
    • It proposes a method to transform apodization parameters for CPWC to achieve equivalent transmit beam characteristics.
    • The research connects CPWC apodization to synthetic transmit aperture imaging (STAI), highlighting its equivalence to multifocus imaging.

    Key Insights:

    • A direct relationship between apodization in CPWC and STAI was derived.
    • Under specific conditions, CPWC apodization transformation is trivial, allowing STAI windows to be extended across the entire angle sequence.
    • In silico validation confirmed that transformed apodization accurately mimics the objective transmit apodization, with minor lateral resolution differences (3-6%).

    Outlook:

    • This work facilitates the development of advanced ultrasound beamforming techniques.
    • It enables more precise control over transmit beams in CPWC for improved image quality.
    • Future research could explore the clinical implications and further optimization of these apodization transformations in medical ultrasound.