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A simulation study of aliasing in computed tomography.

C D Stockham

    Radiology
    |September 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Aliasing artifacts in CT imaging arise from discrete sampling. Key parameters like beam width and ray/view counts influence these artifacts, which were studied using a head phantom simulation.

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    Area of Science:

    • Medical Imaging
    • Radiological Physics

    Background:

    • Aliasing in computed tomography (CT) images is an artifact stemming from the discrete nature of data acquisition.
    • These artifacts are influenced by object characteristics and fundamental imaging parameters.

    Purpose of the Study:

    • To investigate the dependence of aliasing artifacts on parameters like beam width, number of rays, and views in CT imaging.
    • To compare aliasing artifacts with other significant CT artifacts.

    Main Methods:

    • Simulations were performed using a phantom representing a transaxial section of the lower head.
    • The study analyzed the impact of discrete sampling and fundamental imaging parameters on aliasing.
    • Aliasing was compared against artifacts from beam hardening, machine alignment, and noise.

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    Main Results:

    • Aliasing artifact severity is dependent on object characteristics and imaging parameters such as beam width, ray count, and view count.
    • Simulation results indicated that aliasing dependence on geometry was not strong, even with a stationary detector assumption.
    • Aliasing artifacts were found to be potentially less significant than those caused by beam hardening, machine alignment, and noise.

    Conclusions:

    • Fundamental imaging parameters significantly influence aliasing artifacts in CT.
    • Aliasing artifacts are a critical consideration in CT image quality, alongside other sources of degradation.