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Related Experiment Videos

Nonlinear partial volume artifacts in x-ray computed tomography

G H Glover, N J Pelc

    Medical Physics
    |May 1, 1980
    PubMed
    Summary
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    Dark streaks in CT scans are caused by axial partial volume effects. Thin-slice scanning significantly reduces these artifacts, offering a practical solution for cranial imaging.

    Area of Science:

    • Medical Imaging
    • Radiology
    • Image Processing

    Background:

    • Dark streaks are common artifacts in cranial CT reconstructions, particularly near petrous bones.
    • Standard beam hardening corrections offer limited improvement for these specific artifacts.

    Purpose of the Study:

    • To investigate the cause of dark streaks in cranial CT scans.
    • To evaluate the effectiveness of thin-slice scanning and novel correction algorithms.

    Main Methods:

    • Computer simulations were used to study axial partial volume effects.
    • Algorithms were developed to estimate axial variations using adjacent CT slices.
    • Clinical data was used to test the developed correction algorithms.

    Main Results:

    Related Experiment Videos

    • Axial partial volume effects were identified as the cause of the dark streaks.
    • Thin-slice scanning substantially reduced the observed artifacts.
    • Developed correction algorithms were successful in simulations but failed with clinical data.

    Conclusions:

    • Axial partial volume effects are a significant source of streak artifacts in CT.
    • Thin-slice scanning is a practical and effective method for artifact reduction.
    • Overlap scanning may be necessary for a complete correction, but thin-slice scanning is a preferable alternative.