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Related Experiment Videos

Dosimetric considerations in mammography.

K A Hatziioannou1, K Psarrakos, E Molyvda-Athanasopoulou

  • 1Medical Physics Laboratory, Medical School, Aristotle University of Thessaloniki, AHEPA General Hospital, Greece.

European Radiology
|September 26, 2000
PubMed
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This study measured organ radiation doses during mammography. Breast radiation accounts for over 98% of the effective dose, with minimal contributions from other organs like the thyroid.

Area of Science:

  • Medical Physics
  • Radiological Dosimetry
  • Diagnostic Imaging

Background:

  • Mammography is a crucial screening tool for breast cancer detection.
  • Accurate assessment of radiation dose to organs is essential for evaluating the risks associated with mammography.
  • Understanding organ dose contributions is vital for optimizing mammography protocols and patient safety.

Purpose of the Study:

  • To measure the absorbed radiation dose to seven organs beyond the breast during mammography.
  • To determine the contribution of these organs to the overall effective dose from mammography.
  • To investigate the influence of mammographic parameters (kVp, mAs, breast thickness) on organ absorbed doses.

Main Methods:

  • Utilized a lucite upper body anthropomorphic phantom with embedded thermoluminescent dosimeters (TLDs).

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  • Simulated a complete mammographic screening examination (four exposures) to measure organ doses.
  • Analyzed the absorbed dose dependence on varying kVp, mAs, and breast thickness.

    • Main Results:

    • Absorbed doses to most organs were negligible, except for the sternum red bone marrow (SRBM) and thyroid, primarily from scattered radiation.
    • Mean doses to SRBM and thyroid varied based on breast thickness and kVp, ranging from 0.40-1.27 microGy mAs(-1) and 0.05-0.17 microGy mAs(-1), respectively.
    • Effective dose from mammography ranged from 0.66-0.85 microSv mAs(-1), with the breast dose contributing over 98%.

    Conclusions:

    • The radiation dose to the breast is the predominant factor in the effective dose from mammography.
    • Doses to organs like the SRBM and thyroid are significantly lower but depend on examination parameters.
    • Findings support the optimization of mammography techniques to minimize patient radiation exposure while maintaining diagnostic efficacy.