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Mammography Diagnostic Reference Levels (DRLs) in Ghana.

E Dzidzornu¹, S K Angmorterh², B B Ofori-Manteaw³

¹Department of Medical Imaging, School of Allied Health Sciences, University of Health and Allied Sciences (UHAS), Ho, Ghana. Electronic address: https://twitter.com/BettyManteaw.

Radiography (London, England : 1995)

|December 21, 2020

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Ghana established digital mammography Diagnostic Reference Levels (DRLs) to optimize radiation protection. Higher DRLs indicate a need for dose reduction in mammography practices.

Area of Science:

Radiology and Imaging
Medical Physics
Radiation Protection

Background:

Diagnostic Reference Levels (DRLs) are crucial for mammography dose optimization.
Ghana has established DRLs for screen-film mammography but lacks them for digital systems.
Digital mammography is increasingly replacing older screen-film technology.

Purpose of the Study:

To establish local DRLs for digital mammography in Ghana.
To guide mammography practice and radiation protection in the country.

Main Methods:

Retrospective data extraction of Average Glandular Dose (AGD), compressed breast thickness (CBT), kVp, mAs, and Entrance Surface Exposure (ESE).
Calculation of 75th and 95th percentile AGD values at a specific CBT (60 ± 5 mm).
Investigation of correlations between AGD and patient/technical factors.

Keywords:

Average glandular dose Diagnostic reference levels Ghana Mammography

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Main Results:

The 75th percentile DRL for AGD across three centers was 2.0 mGy.
Established DRLs were higher than most international benchmarks, except the UK.
Significant positive correlations were found between AGD and CBT, kVp, mAs, and ESE.

Conclusions:

The preliminary DRLs suggest a need for dose optimization in Ghanaian digital mammography.
Variability in AGD across institutions highlights the importance of standardized practices.
Findings will inform optimization strategies to reduce radiation doses in mammography.