Radiation dose and risk in screening mammography

Area of Science:

• Radiology
• Medical Physics
• Radiation Oncology

Background:

• Screening mammography use varies, with inconsistent image quality and radiation dose.
• Mean glandular dose is the current standard for describing mammography radiation exposure.
• Low-energy X-ray beams in mammography complicate dose-risk relationship interpretation.

Purpose of the Study:

• To evaluate the adequacy of mean glandular dose as an indicator of radiation exposure in screening mammography.
• To investigate alternative metrics for describing radiation dose and associated risks.

Main Methods:

• Analysis of radiation dose metrics including mean glandular dose, maximum glandular dose, and imparted energy.
• Comparison of dose metric increases relative to changes in breast thickness.

Main Results:

• Increases in maximum glandular dose and imparted energy are more significant than mean glandular dose increases with comparable breast thickness.
• Current use of mean glandular dose may obscure the true dose-risk relationship.

Conclusions:

• Mean glandular dose may be an insufficient metric for radiation dose in screening mammography.
• Total imparted energy should replace mean glandular dose for a more accurate representation of radiation dose and risk.