Comparison of computed tomography dose levels across two health facilities in Benin City: a retrospective multicenter study

Abstract

Abstract Background Computed tomography (CT) examinations contribute significantly to medical radiation exposure, necessitating regular dose monitoring and optimization. The establishment of local diagnostic reference levels (DRLs) is crucial for patient radiation protection and dose optimization in medical imaging. Aim This study assesses CT dose levels in two health facilities in Benin City by comparing CT dose index volume (CTDIvol) and dose length product (DLP) values across different CT examinations to identify dose variations and potential contributing factors. Methods A retrospective study design was employed to collect 1595 CT scans (203 abdomen, 123 chest, 1269 head) from University of Benin Teaching Hospital (UBTH) (807 scans) and Lily Hospital (788 scans) from July 2023 to December 2023. Patient DLP and CTDIvol values were computed into mean values, and data from both hospitals were compared and analyzed using IBM SPSS Statistics software version 28. Results Mean CTDIvol and DLP varied significantly across the two health facilities and examination types. For head CT, the mean CTDIvol at UBTH was higher (60.24 ± 8.74 mGy) compared to Lily Hospital (45.62 ± 6.31 mGy). Statistical analysis showed significant variation in CTDIvol and DLP between the two facilities (p < 0.05) as well as among different types of CT examinations. Conclusion The study demonstrated notable variation in CT dose levels between health facilities in Benin City. These findings suggest the need for standardized protocols, regular dose audits, and establishment of local diagnostic reference levels to enhance patient safety and ensure compliance with international dose recommendations.

Keywords

• Computed tomography
• CTDIvol
• DLP
• Radiation dose
• Dose variation
• Optimization