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Related Experiment Videos

Correction for beam hardening in computed tomography.

P K Kijewski, B E Bjärngard

    Medical Physics
    |May 1, 1978
    PubMed
    Summary
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    This study introduces a computed tomography (CT) method to correct beam-hardening artifacts. By modeling tissues as water and bone mineral, CT scan accuracy improves, reducing errors from 5% to under 1%.

    Area of Science:

    • Medical Physics
    • Radiological Imaging

    Background:

    • Beam-hardening artifacts are a common issue in computed tomography (CT) imaging.
    • These artifacts arise from the polychromatic nature of X-ray beams used in CT.
    • Existing methods may not fully address the systematic errors introduced by beam hardening.

    Purpose of the Study:

    • To develop and validate a model-based approach for correcting beam-hardening artifacts in CT.
    • To improve the accuracy of reconstructed attenuation coefficients in CT images.
    • To reduce systematic errors in CT quantitative analysis.

    Main Methods:

    • A mathematical model was employed assuming tissue composition of water and bone mineral.
    • A correction factor was calculated based on measured transmission values.

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  • Reconstructed attenuation coefficients were compared before and after applying the correction.

    • Main Results:

    • The model successfully calculated correction factors for beam-hardening.
    • Corrected transmission values led to reconstructed attenuation coefficients comparable to monoenergetic sources.
    • Systematic errors in uncorrected attenuation coefficients, potentially up to 5%, were reduced to less than 1%.

    Conclusions:

    • The proposed model-based correction effectively reduces beam-hardening artifacts in CT.
    • This method enhances the quantitative accuracy of CT imaging.
    • The findings suggest improved reliability for CT-based measurements in clinical and research settings.