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CT scanning: patterns of use and dose.

F A Mettler1, P W Wiest, J A Locken

  • 1Department of Radiology, University of New Mexico Health Sciences Center, Albuquerque 87131, USA. fmettler@salud.unm.edu

Journal of Radiological Protection : Official Journal of the Society for Radiological Protection
|January 5, 2001
PubMed
Summary

Computed tomography (CT) scans are increasingly common, accounting for significant radiation dose in diagnostic radiology. This study reveals CT scans are frequent, with many patients receiving multiple scans, especially children.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Oncology

Background:

  • Computed tomography (CT) scanning is a prevalent diagnostic imaging procedure.
  • Despite advancements like magnetic resonance imaging (MRI), CT scanner speed and helical techniques have increased CT utilization.
  • Limited data exists on the demographic distribution, scan types, frequency, and radiation dose contribution of CT scans in the United States.

Purpose of the Study:

  • To analyze the age and sex distribution of patients undergoing CT scans.
  • To determine the types of CT scans performed and their frequency.
  • To assess the radiation dose contribution of CT examinations to diagnostic radiology.

Main Methods:

  • A retrospective review of over 33,700 consecutive CT examinations conducted between 1998 and 1999.

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  • Data collection included patient demographics (age, sex), scan types, and examination frequency.
  • Analysis of CT examination trends and radiation dose contribution compared to other radiology procedures.

    • Main Results:

    • CT examinations increased from 6.1% to 11.1% of all radiology procedures between 1990 and 1999.
    • Nineteen percent of patients had at least one CT scan, with over half receiving multiple scans.
    • Children (0-15 years) comprised 11.2% of scans, and the 36-50-year age group had the highest scan percentage.
    • CT scanning accounted for 67% of the effective dose from diagnostic radiology.

    Conclusions:

    • CT scanning represents a significant and growing proportion of diagnostic radiology examinations and radiation dose in the US.
    • A substantial number of patients undergo multiple CT scans, and pediatric CT scans are more common than previously estimated.
    • Further research into radiation dose optimization and patient safety in CT imaging is warranted.