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    Point spread function (PSF) modeling in photoacoustic computed tomography (PACT) reveals how detection geometry impacts image quality. Understanding these factors aids in designing better PACT systems for clearer images.

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    Area of Science:

    • Medical Imaging
    • Biomedical Engineering
    • Optical Physics

    Background:

    • Point spread function (PSF) is critical for assessing photoacoustic computed tomography (PACT) imaging performance.
    • Understanding PSF degradation mechanisms is essential for improving PACT systems.
    • Detection geometry significantly influences PSF characteristics.

    Purpose of the Study:

    • To investigate the degradation mechanisms of PSF in PACT.
    • To analyze the impact of detection geometry shape on PSF.
    • To model PSF for various detector array configurations and non-ideal detection conditions.

    Main Methods:

    • PSF modeling was performed for circular, curved, and linear 2D detector arrays.
    • The influence of detector bandwidth and aperture on PSF was studied for non-ideal geometries.
    • PSFs were simulated for typical detector bandwidths and aperture sizes for each geometry.
    • Experimental validation was conducted to confirm the modeling results.

    Main Results:

    • The shape of the detection geometry (circular, curved, linear) demonstrably affects the PSF.
    • Detector bandwidth and aperture size contribute to PSF degradation in PACT.
    • Simulated PSFs for different configurations provide insights into imaging performance.
    • Experimental results validated the accuracy of the PSF modeling approach.

    Conclusions:

    • The developed PSF modeling approach accurately predicts imaging performance in practical PACT systems.
    • The study highlights the importance of detector array design for optimizing PACT image quality.
    • Findings offer guidance for developing PACT systems with enhanced imaging capabilities.