1. Medical Physics, Tikur Andesa Specialized Hospital, Department of Radiology, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia
2. Medical Physics, Department of Physics, College of Natural and Computational Sciences, Woldia University, Woldia, Ethiopia
3. Department of Medical Radiologic Technology, School of Medicine, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia
4. Radiation and Nuclear Technology Notification and Authorization, Ethiopia Technology Authority, Addis Ababa, Ethiopia