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Related Experiment Videos

Truncated-view artifacts: clinical importance on CT.

J L Lehr

    AJR. American Journal of Roentgenology
    |July 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Truncated-view artifacts in computed tomography (CT) scanners can distort quantitative analyses by altering CT numbers. Ensuring patients and objects are fully within the field of view minimizes this common imaging artifact.

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    Area of Science:

    • Medical Imaging
    • Radiology
    • Computed Tomography

    Background:

    • Truncated-view artifacts occur in CT when parts of the patient or object are not captured in all acquired views for a slice.
    • This artifact arises in CT scanners where the fan beam does not cover the entire gantry aperture, common in many current systems.
    • While visually subtle, these artifacts can significantly impact the accuracy of quantitative CT analyses.

    Purpose of the Study:

    • To describe the nature of the truncated-view artifact in CT imaging.
    • To present simulated examples of this artifact using mathematical phantoms and clinical scans.
    • To provide methods for eliminating or minimizing the truncated-view artifact.

    Main Methods:

    • Simulated CT scans using mathematical phantoms.

    Related Experiment Videos

  • Analysis of clinical CT scans exhibiting the artifact.
  • Description of artifact generation based on field-of-view limitations.

    • Main Results:

    • Truncated-view artifacts alter CT numbers, compromising quantitative analysis accuracy.
    • Simulations demonstrated the artifact's presence in both phantoms and clinical data.
    • The severity of visual disturbance may not correlate with the impact on quantitative accuracy.

    Conclusions:

    • The truncated-view artifact is a critical consideration for accurate quantitative CT analysis.
    • Eliminate the artifact by ensuring complete inclusion of the patient and all objects within the field of view.
    • Minimize the artifact by positioning uncontainable objects closest to the gantry aperture's edge.