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Solid-state dosimeters (SStDs) show good agreement for mammography kVp but poor agreement for half-value layer (HVL) and air kerma (AK) compared to ionization chambers (ICs). This impacts average glandular dose (AGD) accuracy, necessitating careful comparison of SStD and IC results.

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Area of Science:

  • Medical Physics
  • Radiological Dosimetry
  • Diagnostic Imaging Technology

Background:

  • Accurate dose assessment in mammography is crucial for patient safety and effective screening.
  • Digital mammography units utilize various target/filter (TF) combinations, influencing radiation output.
  • Solid-state dosimeters (SStDs) are increasingly used for mammography surveys, requiring validation against established methods.

Purpose of the Study:

  • To compare the performance of commercially available SStDs from different manufacturers used in mammography surveys.
  • To evaluate dose estimation differences between SStDs and ionization chambers (ICs) across various TF combinations.
  • To review the scientific basis for mammography dose measurements using both traditional and SStD methods.

Main Methods:

  • Evaluated SStDs from four manufacturers using two digital mammography units (GE Essential, Hologic Dimensions).
  • Compared measurements for peak tube potential (kVp), half-value layer (HVL), and air kerma (AK) across multiple TF combinations (Mo/Mo, Mo/Rh, Rh/Rh, W/Rh, W/Ag, W/Al).
  • Assessed relative average glandular doses (AGDs) and evaluated scatter effects from compression paddles by comparing SStD and IC measurements.

Main Results:

  • SStDs demonstrated good accuracy for kVp measurements (within ±1.1 kVp) but showed greater discrepancies for HVL (-6.5% to +3.5%) and AK (-6% to +7%) compared to reference IC values.
  • Relative AGDs calculated using SStD measurements generally underestimated doses compared to IC reference values (discrepancies up to -10%).
  • Accounting for scatter radiation effects in AK measurements reduced discrepancies between SStD and IC AGD values.

Conclusions:

  • SStDs exhibit good agreement with set kVp but poor agreement with HVL and AK measurements when compared to ICs.
  • Discrepancies in AGD are partly due to differing responses to scattered radiation, with ICs typically yielding higher AGDs.
  • Medical physicists should compare SStD results with traditional methods to identify and manage potential discrepancies in mammography dose assessments.