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Related Concept Videos

Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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    Weighted periodic sparse arrays (wPSAs) reduce complexity in ultrasound imaging by suppressing grating lobes. This method enhances image contrast, particularly for portable systems, with potential for clinical applications.

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    Area of Science:

    • Medical Imaging
    • Acoustics
    • Array Signal Processing

    Background:

    • Sparse arrays simplify ultrasonic imaging systems by reducing active elements and circuits.
    • One-dimensional (1-D) sparse arrays are crucial for miniaturized systems like handheld or smartphone-based devices.
    • Previous work established an analytic method for designing 1-D periodic sparse arrays (PSAs).

    Purpose of the Study:

    • To enhance the design of 1-D PSAs by incorporating aperture weighting functions.
    • To suppress grating lobes in ultrasonic beam patterns using tapered rectangular weighting functions.
    • To evaluate the performance of weighted PSAs (wPSAs) in terms of grating lobe suppression, contrast, resolution, and signal-to-noise ratio.

    Main Methods:

    • Developed a method to design wPSAs by convolving base and weighting array aperture functions, followed by upsampling and further convolution.
    • Determined transmit and receive PSA patterns and derived corresponding aperture weighting functions.
    • Utilized pulsed wave (PW) simulations and phantom imaging experiments with a 1-D phased array to validate the design.

    Main Results:

    • wPSAs demonstrated improved grating lobe suppression compared to standard PSAs in simulations.
    • Phantom imaging showed enhanced contrast with wPSAs due to suppressed grating lobes, with a minor trade-off in lateral resolution.
    • Signal-to-noise ratio (SNR) decreased with higher sparseness factors (SFs) but remained comparable between wPSAs and PSAs.
    • In vivo echocardiography revealed the clinical potential of wPSAs, especially at high SFs.

    Conclusions:

    • The wPSA approach effectively enhances image contrast in ultrasound systems by suppressing grating lobes.
    • wPSAs offer a method to achieve comparable image quality with greater sparseness, further reducing system complexity.
    • The wPSA technique shows significant promise for advancing the development of more compact and efficient ultrasound imaging devices.