The Evaluation of Entrance Surface Air Kerma from Conventional Diagnostic Radiography in Prasat Neurological Institute Using Dose Area Product Values
Keywords:
Entrance Skin Dose (ESD), Entrance Surface Air Kerma (ESAK), Dose Area Product (DAP), Diagnostic Reference Levels (DRLs)Abstract
Background : Entrance skin dose (ESD) from conventional diagnostic radiographic examination should be measured for radiation protection to the patient.
Objective : To evaluate the ESD in term of Entrance Surface Air Kerma (ESAK) of the patients underwent conventional diagnostic radiography examinations at Prasat Neurological Institute to compare with the diagnostic reference levels (DRLs) of the International Atomic Energy Agency (IAEA) and the previous studies.
Methods : The ESAK had been calculated using Dose Area Product (DAP) values and Backscatter factor from totally 100 patients of skull, chest, abdomen, lumbar spine and pelvis radiography.
Results : The mean and standard deviation of ESAK were 0.91±0.48 mGy for antero-posterior (AP) skull, 0.70±0.42 mGy for lateral (LAT) skull, 0.08±0.01 mGy for postero-anterior (PA) chest, 0.46±0.21 mGy for AP abdomen, 1.67±0.85 mGy for AP lumbar spine, 3.31±0.80 mGy for LAT lumbar spine and 0.62±0.23 mGy for AP pelvis. The mean ESAK of the patients in this study was statistically significant lower than the mean ESAK of IAEA and comparable references ESAK values published in the literature. The 3rd quartiles of this study also lower than the DRLs of IAEA.
Conclusion : Patient skin dose derived from conventional diagnostic radiography examination using exposure parameter settings in our institute was lower than the DRLs.
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