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Related Experiment Videos

Energy imparted and effective doses in computed tomography

J V Atherton1, W Huda

  • 1Department of Radiology, University of Florida, College of Medicine, Gainesville 32610-0374, USA.

Medical Physics
|May 1, 1996
PubMed
Summary

Estimating patient radiation dose from CT scans is complex. This study provides ratios of effective dose (E) to energy imparted (epsilon) to simplify radiation risk assessment for computed tomography (CT) examinations.

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Area of Science:

  • Medical Physics
  • Radiology
  • Radiation Dosimetry

Background:

  • Radiation risk in computed tomography (CT) is assessed using effective dose (E) and effective dose equivalent (HE).
  • Direct measurement of E and HE is challenging, unlike total energy imparted (epsilon).

Purpose of the Study:

  • To determine representative ratios of HE/epsilon and E/epsilon for CT examinations.
  • To facilitate more accessible quantification of patient radiation dose in CT.

Main Methods:

  • Utilized published Monte Carlo organ dose computations.
  • Employed typical computed tomography (CT) x-ray spectra.
  • Calculated ratios of HE/epsilon and E/epsilon.

Main Results:

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  • Established representative values for the ratios HE/epsilon and E/epsilon.
  • Demonstrated that patient dose per unit energy imparted can be calculated.

    • Conclusions:

    • The derived ratios enable simplified quantification of patient radiation dose for any CT examination.
    • This approach aids in better characterizing radiation risk in computed tomography (CT).