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18. ESTIMATION OF ENTRANCE SKIN DOSE AND EFFECTIVE DOSE OF PATIENTS UNDERGOING X-RAY EXAMINATIONS USING MATHEMATICAL MODELS by Hankouraou Seydou and Hamza Abubakar Hamza Volume 53 (November 2019 Issue)
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ESTIMATION OF ENTRANCE SKIN DOSE AND EFFECTIVE DOSE OF PATIENTS UNDERGOING X-RAY EXAMINATIONS USING MATHEMATICAL MODELS

Hankouraou Seydou and Hamza Abubakar Hamza

Department of Physics, Gombe State University, Gombe, Nigeria

Abstract

The aim of the current work was to estimate entrance skin dose (ESD) using mathematical models for selected X-ray examinations at Federal Teaching Hospital (FTH) Gombe. Effective dose (ED) was also calculated. At the beginning, the patient’s information’s such as age, weight and height was recorded and then the patient was centered by technician to be ready for radiographic. The parameters such as peak tube voltage (kVp), exposure current and time product (mAs) and focus to skin distance (FSD) was recorded at the time of the examination. This information’s was recorded for each patient undergoing the particular diagnostic procedure. A total number of 374 patients were examined at FTH Gombe. The mean calculated ESD values for Chan & Tsai, Edmond, Kumar and Arun models were found to be in the ranging between 0.02 - 4.60 mGy, 0.03 – 6.37 mGy, 0.01 – 3.65 mGy and 0.02 – 6.10 mGy respectively. For the EDs values for Chan & Tsai, Edmond, Kumar and Arun models were found to be in the ranging between 0.02 – 0.22 mSv, 0.03 – 0.28 mSv, 0.03 – 0.23 mSv and 0.04 – 0.35 mSv receptively. In the current work, the calculated mean ESD for Chest AP, Chest PA, Chest LAT, Pelvis AP, LSS AP, LSS LAT, Abdomen AP, C. Spine AP and C. Spine LAT are; 0.36, 0.51, 1.33, 1.24, 2.85, 4.60, 1.93, 0.49 and 0.42 mGy respectively. The calculated mean EDs for Chest PA, Chest LAT, Abdomen AP, Pelvis AP, LSS AP and LSS LAT are; 0.023, 0.08, 0.16, 0.073, 0.17 and 0.27 mSv respectively. On the basis of the current results obtained in this study, it implies that the radiation risk to an average patient in the hospital is low and the risk to workers in the hospital is also low.

Keywords: Entrance Skin Dose, Effective Dose, Mathematical Models, Patient, dosimeter.

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