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Related Experiment Videos

Radiation dose associated with spiral computed tomography

P L McGhee1, S Humphreys

  • 1Department of Medical Physics, Northeastern Ontario Regional Cancer Centre, Sudbury.

Canadian Association of Radiologists Journal = Journal L'Association Canadienne Des Radiologistes
|April 1, 1994
PubMed
Summary
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Radiation dose from spiral computed tomography (CT) was assessed using phantoms. Standard dose descriptors, CT dose index and multiple-scan average dose, adequately quantify spiral CT radiation doses.

Area of Science:

  • Medical Imaging
  • Radiology
  • Radiation Dosimetry

Background:

  • Spiral computed tomography (CT) is a widely used diagnostic imaging tool.
  • The introduction of spiral CT necessitates a thorough understanding of patient radiation dose.
  • Accurate dose assessment is crucial for patient safety in medical imaging.

Purpose of the Study:

  • To comprehensively understand the magnitude and distribution of patient radiation dose during spiral CT.
  • To compare dose distributions between conventional and spiral CT techniques.
  • To validate the use of standard dose descriptors for spiral CT radiation dose assessment.

Main Methods:

  • Utilized thermoluminescent dosimeters placed in standard phantoms to measure dose distributions.
  • Measured radiation doses for both conventional CT and spiral CT protocols.

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  • Compared the measured dose distributions to evaluate the effectiveness of dose descriptors.

    • Main Results:

    • Spiral CT introduces new considerations for patient radiation dose assessment.
    • Standard dose descriptors, specifically the CT dose index and multiple-scan average dose, were found to be applicable to spiral CT.
    • The study confirmed the validity of using these established metrics for quantifying spiral CT radiation dose.

    Conclusions:

    • Established dose descriptors are suitable for quantifying radiation doses delivered by spiral CT.
    • This finding supports the continued use of CT dose index and multiple-scan average dose in clinical practice for spiral CT.
    • Ensures consistent and reliable radiation dose reporting in CT examinations.