Hassan, Abdullahi A.Umar, IbrahimIge, Taofeeq A.Joseph, Dlama Z.Aisha, A.Rilwan, Usman2023-12-142023-12-142020-09-10[1] Zira, J. D., Salisu, A. Y., Sani, U. M., Chukwuemeka, N. C., Tunde, J. J., Skam, J. D., Mundi, A., Ibrahim, U., Hassan, W.E., Boboin, N.F. & Silas, M. A. (2019) Entrance Surface Dose Determination for Common Adult Radiography Examination in Selected Tertiary Hospitals in North Eastern Nigeria. African Journal of Medical Physics, 2(1):38-43 [2] Alumuku, L., Iortile, J. T., & Agba, E. H. (2014). Testicular Doses of Patients Undergoing Radiological Examination of the Chest at Federal Medical Centre Makurdi, Nigeria. International Journal of Advances in Life Science and Technology, 1(1), 1-5. [3] Karim, M. K. A., Hashim, S., Sabarudin, A., Bradley, D. A., & Bahruddin, N. A. (2016). Evaluating organ dose and radiation risk of routine CT examinations in Johor Malaysia. Sains Malaysiana, 45(4), 567-73. [4] Bongartz, G., Golding, S. J., Jurik, A. G., Leonardi, M., van Meerten, E. V. P., Gelejins, J., Jessen, K. A., Panzer, W., Shrimpton, P. C., Tosi, G. (2014). European Guidelines on Quality Criteria for Computed Tomography. [5] Brenner, D. J., & Hall, E. J. (2007). Computed tomography—an increasing source of radiation exposure. New England Journal of Medicine, 357(22), 2277-2284. [6] Oyedokun, O. S., Arogunjo, A. M., Fatukasi, J. I., & Egberongbe, A. A. (2020). Diagnostic Reference Level of Computed Tomography Examinations and Need for Dose Optimization in Ondo State, Nigeria. Iranian Journal of Medical Physics, 17(4), 266-272. [7] Foley, S. J., McEntee, M. F., & Rainford, L. A. (2012). Establishment of CT diagnostic reference levels in Ireland. The British journal of radiology, 85(1018), 1390-1397. [8] Australian radiation protection. ”CT Radiation Dose Optimisation Program”. 2008. [9] European Commission (1999). “Guidance on diagnostic reference levels (DRLs)https://keffi.nsuk.edu.ng/handle/20.500.14448/6030Radiation dose levels for adult most common Computed Tomography (CT) examinations namely brain, chest and abdomen CT scans were studied. Radiation dose reports, scan parameters and demographic information were surveyed for a period of three - months. Ethical approvals were obtained from the research ethics committee of Ministry of Health and the studied centers. Data were randomly collected using a simple random technique from 131 adult patients with weights 70 ± 3kg. The General Electric 8 and 16-slice and 160-slice Toshiba CT scanners were used in the study. The data were analyzed using SPSS (version 20.0 Chicago) statistical software. The results indicated that the CTDIw and DLP values were (62.5 mGy and 2946mGy*cm), (9.9mGy and 663.3 mGy*cm) and (13.5 mGy and 1397 mGy*cm) for brain CT, chest CT and abdominal CT scans respectively. The study shows that the CTDIw values are relatively similar to those reported in established work by the European Commission. However, the DLP values are comparably higher than those of the European Commission. This revealed that there is need for robust and sustained optimization program so as to reduce patient doses without affecting diagnostic image quality.enComputed Tomography; Head; Chest; Abdomen; Dose Reference levels; Scanning parameter.Article