Assessment of Radiation Dose and Noise in Chest Computed Tomography Examination

Abstract

This research aims to assess radiation dose and noise for chest during CT examination in four centers of diagnostic images , A total of 100 patient undergoing chest CT exams ,CT machine were used to collect data during this study , General Electric(GE) optima ,GE bright speed, GE health care manufactured USA and Toshiba manufactured Japan .The radiation dose were assess using CTDIvol , DLP and noise was assessed by stander deviation in region of interest. all data analyzed using SPSS analysis. In this study I founded the mean effective dose, mean noise, mean Dose Length Product , CT Dose Index volume for chest in the first center (6.65msv), (13.84HU), (395.07mGy.cm), (11.57mGy) respectively, in second center (6.67msv), (8.79HU), (13.02mGy), (383.36mGy.cm), in 3rd center and (5.18msv), (11.34HU), (6.95mGy) and (280.89mGy.cm). In 4th center mean E (6.26msv), noise (15.08HU), DLP (385.51mGy.cm) and CTDI (12.37). The effective dose and noise were observed difference in this four centers ,the difference was due to type and age of machine ,chest protocol and parameter used Then the effective dose been compared with maximum permissible dose level MPDL and I founded with in MPDLs (2-20msv),the average dose length product and CT dose index volume compared with international diagnostic reference level and I were founded with in IDRLs for chest(650mGy.cm) (30mGy) respectively .