Estimation of Patient Effective Dose During Adult Brain CT Examination

Abstract

This study intends to assess the ED of patient undergoing brain CT in three hospitals in Khartoum state. A total of 90 patients 30 in (Alaml Hospital), 30 in (Alzaytouna Hospital) and 30 in (Army Hospital) were examined. The mean of (ED) Age, Kvp, mAs, slice thickness, Slice Number, Scan time, Scan Length, number of rotation, TF, Collimation, Pitch, CTDIw, CTDIvol, DLPw. These correlations coefficient between the Effective dose (mSv) and (number of slice, Scan length, DLPw) was obtained for all hospitals. the final result shows that there was a correlation between the ED values and (number of slice, Scan length, DLPw) for all hospitals (correlation coefficient R2 ranged from (0.5224 to 0.8992). some result reveal that there was no correlation between ED values and scan length for patient undergoing brain CT such as in Alaml Hospital. As comparison between the three hospitals the higher effective dose obtained from this study was in Alzaytouna hospital then alaml hospital and then army hospital which was [4.64, 4.61, 3.636] respectively. In this study, large variations of radiation effective dose were observed. Different scanning protocols used among hospitals and variation in equipment design among manufacturers and models were responsible for these variations. The main contributor for this difference was the use of a larger scan length in Alzaytouna hospital than that used in alaml hospital and army hospital.