DEVELOPMENT OF INSTITUTIONAL-BASED DIAGNOSTIC REFERENCE LEVELS (IBDRLS) FOR OPTIMIZED RADIATION DOSE IN MAMMOGRAPHY AT THE UNIVERSITY OF ABUJA TEACHING HOSPITAL, NIGERIAA

Abstract

Introduction: Diagnostic Reference Levels (DRLs) are pivotal in optimizing radiation dose for patient safety during diagnostic and interventional radiological procedures. Mammography is a specialized radiographic examination of the breast, which is essential for early breast cancer detection, employs low energy X-rays, necessitating precise dose optimization. Methodology: Mean glandular dose (MGD) was assessed using thermoluminescent dosimeters (TLDs) and mammography machine-displayed dose values. DRLs were determined as the 75th percentile of the median dose distribution. Statistical methods, including Pearson correlation and paired t-tests, were employed to analyze discrepancies and relationships between the two measurement methods with p value <0.05. Results: Machine-displayed MGD averaged 2.46 ± 0.80 mGy, significantly higher than the TLD-derived MGD of 0.45 ± 0.47 mGy. DRLs established were 0.50 mGy (TLD) and 3.00 mGy (machine-displayed), aligning with international recommendations. A positive correlation was observed between machine MGD and compressed breast thickness (CBT), whereas TLDderived MGD showed no significant relationship. Objective: To establish an Institutional-Based D i a g n o s t i c R e f e r e n c e L e v e l ( I B D R L ) f o r mammography at the University of Abuja Teaching Hospital, Nigeria. Conclusion: Discrepancies between TLD and machine displayed doses highlight the importance of consistent dose measurement methods. Both approaches are effective for DRL establishment, promoting patient safety through dose optimization. This study provides a framework for local DRL development, supporting standardized mammography practices and adherence to global standards.