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Related Experiment Videos

Patient dose in digital mammography.

Margarita Chevalier1, Pilar Morán, José I Ten

  • 1Department of Radiology, Facultad de Medicina, Universidad Complutense de Madrid, 28040 Madrid, Spain. chevalier@med.ucm.es

Medical Physics
|October 19, 2004
PubMed
Summary

This study analyzed mammography doses for 5034 patients, finding average glandular doses (AGD) per exposure and per examination. Results show AGD varies with breast thickness and view, with older women receiving slightly higher doses.

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Area of Science:

  • Radiology
  • Medical Physics
  • Public Health

Background:

  • Mammography is a key tool for breast cancer screening.
  • Understanding radiation dose is crucial for optimizing mammography protocols.
  • Digital mammography systems offer opportunities to analyze dose variations.

Purpose of the Study:

  • To analyze mammography radiation doses in a large patient cohort.
  • To evaluate exposure factors and their relationship with breast thickness.
  • To determine average glandular dose (AGD) for different views and patient age groups.

Main Methods:

  • Retrospective analysis of 20,137 mammographic images from 5034 patients (March 2001-October 2003).
  • Extracted DICOM header data including patient age, breast thickness, kVp, mAs, and target/filter combinations.

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  • Calculated Entrance Surface Air Kerma (ESAK) and Average Glandular Dose (AGD) using established conversion factors.

    • Main Results:

    • Mean patient age was 56 years, mean compressed breast thickness was 52 mm.
    • Automatic exposure modes were used for 98% of images, with specific target/filter combinations varying by breast thickness.
    • Mean AGD(T) per exposure was 1.88 mGy, and per examination was 3.8 mGy.
    • Mean dose for cranio-caudal (CC) views was lower than medio-lateral oblique (MLO) views.
    • Older women (50-64) received slightly higher mean AGD(T) (1.90 mGy) compared to younger women (40-49) (1.85 mGy), attributed to greater breast thickness.

    Conclusions:

    • Mammography dose parameters are influenced by breast thickness, patient age, and imaging view.
    • System calibration and automatic exposure control play significant roles in dose delivery.
    • Findings provide valuable data for optimizing mammography protocols and ensuring patient safety.