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The exponential edge-gradient effect in x-ray computed tomography

P M Joseph, R D Spital

    Physics in Medicine and Biology
    |May 1, 1981
    PubMed
    Summary
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    The exponential edge-gradient effect in x-ray CT scanners causes negative errors, appearing as streaks. Increased sampling density aids in correcting these artifacts, improving image quality.

    Area of Science:

    • Medical Imaging
    • Physics

    Background:

    • X-ray transmission computed tomography (CT) scanners are susceptible to artifacts.
    • The exponential edge-gradient effect arises from interactions between X-ray attenuation and beam width.

    Purpose of the Study:

    • To analyze the non-linear exponential edge-gradient effect in X-ray CT.
    • To investigate the nature and cause of image artifacts induced by this effect.
    • To evaluate methods for correcting these artifacts.

    Main Methods:

    • Theoretical analysis of X-ray attenuation and beam geometry.
    • Simulation of CT scans with varying edge contrasts and sampling densities.
    • Development and testing of approximate correction algorithms.

    Main Results:

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    • The exponential edge-gradient effect introduces negative errors in projection values.
    • Artifacts manifest as lucent streaks from single edges and dense streaks from paired edges.
    • Exact correction is only possible under idealized, unrealistic conditions.

    Conclusions:

    • Increased sampling density is crucial for effective approximate correction of edge-gradient artifacts.
    • Two classes of approximate correction algorithms demonstrate practical utility.
    • One algorithm shows promise for real-world CT applications with limited sampling.