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Related Experiment Videos

An improved image algorithm for CT scanners

R C Chase, J A Stein

    Medical Physics
    |November 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a novel method to remove CT head imaging artifacts. The technique addresses cupping and whitening effects for clearer skull-based imaging.

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    Area of Science:

    • Medical Imaging
    • Radiological Physics

    Background:

    • Computed Tomography (CT) head-section images commonly exhibit a "cupping" or "whitening" artifact near the skull.
    • This artifact is partly attributed to the polychromatic nature of the X-ray beam used in CT scans.

    Purpose of the Study:

    • To present a general, empirical method for removing CT head-section artifacts.
    • To improve image quality by addressing cupping and whitening effects near the skull.

    Main Methods:

    • A two-pronged approach is employed: modifying raw transmission data to remove gross cupping and adjusting the reconstruction filter function to eliminate residual whitening.
    • The method involves convolution or deconvolution of the CT image with a point spread function.
    • Filter modifications are conceptualized in real space for enhanced understanding.

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    Main Results:

    • Demonstration of artifact removal using the AS&E CT scanner.
    • Successful reduction of both gross cupping and residual whitening artifacts.
    • The described method provides a practical solution for improving CT head image clarity.

    Conclusions:

    • The presented method effectively removes common CT head artifacts.
    • The empirical approach, modifying transmission data and reconstruction filters, offers a practical solution for enhancing image quality.
    • Understanding filter modifications in real space simplifies the process.