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Related Concept Videos

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Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
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Source Density Apodization: Image Artifact Suppression Through Source Pitch Nonuniformity.

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    Source density apodization (SDA) reduces ultrasound artifacts by varying transducer spacing, unlike traditional amplitude apodization (AmpA). SDA improves image quality, especially with fewer elements, enabling faster imaging with simpler systems.

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    Area of Science:

    • Medical Imaging
    • Acoustics
    • Ultrasound Technology

    Background:

    • Conventional ultrasound probes use periodic transducer arrays, leading to grating and sidelobe artifacts.
    • Amplitude apodization (AmpA) effectively suppresses sidelobes but not grating lobes.
    • Reducing element pitch to suppress grating lobes is technologically difficult and expensive.

    Purpose of the Study:

    • To introduce and evaluate source density apodization (SDA) as an alternative to conventional apodization schemes.
    • To demonstrate SDA's effectiveness in suppressing both sidelobe and grating lobe artifacts in ultrasound imaging.
    • To explore SDA's potential for improving image quality with reduced channel counts and enabling higher frame rates.

    Main Methods:

    • Developed and implemented an all-optical ultrasound imaging setup for dynamic array reconfiguration.
    • Conducted numerical simulations and experimental validations of SDA.
    • Investigated the impact of varying spatial source density and array geometry on image quality.

    Main Results:

    • SDA was shown to be equivalent to AmpA for a large number of sources.
    • SDA significantly suppressed both side and grating lobes, yielding superior image quality with fewer sources.
    • Asymmetric SDA schemes allowed for localized, dynamic image quality enhancement.
    • Non-smooth source density variations were found to cause image artifacts.

    Conclusions:

    • Source density apodization (SDA) offers a novel approach to artifact reduction in ultrasound imaging.
    • SDA enables high image quality with reduced channel counts, paving the way for more complex and faster ultrasound systems.
    • The findings highlight SDA's potential to enhance ultrasound imaging capabilities, particularly in scenarios with limited hardware resources.