Evaluation of Image Quality and Radiation Dose in Computed Radiography

Abstract

IV Abstract The assessment of image quality and patient dose from computed radiography for common x-ray examinations namely skull Posterior Anterior and Lateral , chest Posterior Anterior , lumber spine Anterior Posterior and Lateral and pelvis Anterior Posterior radiography was perfumed in three private hospitals in capital Khartoum . image quality evaluated by using threshold contrast-detail phantom (TO. 20). Assessment obtained by average scores from four specialist . This study deals with evaluation of patient dose received by patients undergoing radiological examinations , Three large hospitals in Khartoum were selected and 164 patients made up the sample .The entrance surface doses (ESDs) to patient undertakening four common x.ray examination (skull PA& LAT , chest PA , lumber spine AP & LAT, pelvis AP) were estimated using ionization chamber for air kerma measurements . Exposure settings and patients data were recorded . Result concerning the kilovoltage (KVp) and tube current (mAs) and focus to film distance (FFD) settings . and the ESD values were analyzed and compared (by other hospitals) to those recommended by the EU . discrepancies in the patient doses and techniques used for the examinations studied were found among the different hospitals denoting the importance of establishing a national quality assurance programme and examination protocols to ensure patient doses are Kept as Low as possible . All the examinations studied fulfilled the EU recommendations . The result of image quality show small different between three hospitals which indicate the routine quality assurance and quality control play important role in the equipment performance.