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Related Experiment Videos

Computed tomography: beam hardening and environmental density artifact.

S W Young, H H Muller, W H Marshall

    Radiology
    |July 1, 1983
    PubMed
    Summary

    Beam hardening in computed tomography (CT) scanning affects imaging results. Adding contrast material to CT body phantoms decreased CT numbers, while in head scanning phantoms, it increased CT numbers.

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    Area of Science:

    • Medical Imaging
    • Radiology
    • Physics

    Background:

    • Computed tomography (CT) scanning is crucial for medical diagnosis.
    • Beam hardening is an artifact in CT imaging that can affect accuracy.
    • Simulating anatomical structures with phantoms is essential for scanner evaluation.

    Purpose of the Study:

    • To evaluate the impact of beam hardening on a GE CT/T 8800 scanner.
    • To assess how iodinated contrast material influences CT numbers in simulated anatomical structures.
    • To understand the effects in both body and head CT scanning scenarios.

    Main Methods:

    • Utilized phantoms simulating cysts, avascular masses, and calvarium.
    • Scanned phantoms before and after adding iodinated contrast material.
    • Analyzed changes in CT numbers within different phantom compartments.

    Main Results:

    • In body phantoms, contrast material generally decreased CT numbers in simulated cysts.
    • In head scanning phantoms, contrast material in a peripheral ring increased CT numbers of contained materials.
    • Observed inhomogeneous increases in CT numbers in the head phantom simulation.

    Conclusions:

    • Beam hardening effects are influenced by the presence and location of iodinated contrast material.
    • Contrast material can alter CT numbers differently in body versus head imaging simulations.
    • These findings are important for accurate interpretation of CT scans.

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