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Related Experiment Videos

Radiation dose and somatic risk from computed tomography.

K Faulkner1, B M Moores

  • 1Regional Department of Medical Physics and Bioengineering, Christie Hospital, Manchester, England.

Acta Radiologica (Stockholm, Sweden : 1987)
|July 1, 1987
PubMed
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Lithium fluoride thermoluminescent dosimeters (TLD) measured radiation doses in CT scans. Estimated organ doses reveal somatic and genetic risks for head, lung, liver, and pelvis scans, with contrast exams posing higher risks.

Area of Science:

  • Medical Physics
  • Radiological Protection
  • Dosimetry

Background:

  • Computed tomography (CT) utilizes ionizing radiation, necessitating accurate dose assessment.
  • Lithium fluoride (LiF) thermoluminescent dosimeters (TLDs) are established tools for radiation dosimetry.
  • Understanding radiation dose distribution is crucial for evaluating patient risk in medical imaging.

Purpose of the Study:

  • To measure radiation dose distribution in a phantom using LiF TLDs across various CT scanners.
  • To estimate organ doses for common CT examinations (head, lung, liver, pelvis).
  • To deduce the associated somatic and genetic risks for patients undergoing these CT procedures.

Main Methods:

  • Utilized LiF TLDs to measure central axis dose in air and dose distribution within a phantom.

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  • Collected data from seven different CT scanner models (EMI and Siemens).
  • Estimated organ doses by referencing published tables and measured central axis doses.

    • Main Results:

    • Presented dose measurements for multiple CT scanner types.
    • Calculated somatic risks for average male and female patients for head, lung, liver, and pelvis CT scans.
    • Determined that head CT scans carry a risk approximately 250 times higher than dental pantomography; contrast-enhanced scans double the risk.

    Conclusions:

    • LiF TLDs effectively measure radiation doses in CT imaging.
    • CT examinations pose quantifiable somatic and genetic risks, varying by examination site and patient sex.
    • Risk assessment is vital for optimizing CT protocols and patient safety, especially with contrast agents.