Evaluation of Patient Effective Dose and Organ Dose during Chest Computed Tomography

Abstract

The aim of this study to evaluate of patient effective dose and radiation doses received by critical organs of the patients undergoing chest CT examination. The study was done on 61 patients (31 males and 30 females) in age range between 16 to 90 years , who came for routine chest multi-detector computed tomography model Toshiba Aquilition (16 slice) and CT Toshiba Alixon (16 slice) in two hospitals, in Khartoum state, namely (Alzaytouna and Yasatpshoron), during the period from September 2018 to February 2019. The parameters collected of the data (KVP, mAS, age, gender, slice thickness, total scan time, pitch, scan length, CTDIvol, and DLP), and calculated CTDIvol, DLP, E, and organ doses by CT expo version 2.5 software and the data were analyzed using Excel. The results of this study were the means of critical organ dose for hospital (Y) which were (12.8± 0.04)mSv, (12.4± 0.1) mSv, (6.7 ± 4.6) mSv for Breast, Lung, Thyroid respectively, and the means of critical organ dose for hospital (Z) were (27.8 ± 0.04) mSv, (27.2 ± 0.1) mSv, (38.8± 2.9) mSv, Breast, Lung, Thyroid respectively. The means of effective dose in hospital (Y) and hospital (Z) were (5.3 ± 1.04) mSv, (14.2 ± 1.8) mSv respectively. From which it could be conclude the radiation dose received by the critical organs of the patients undergoing CT chest examination at hospital (Z) is higher than radiation dose received by the critical organs of the patients undergoing CT chest examination at hospital (Y), and the mean of effective dose for patients at hospital (Z) is higher than the mean of effective dose for patients at hospital (Y). The effective dose in this study was compared with different reported values from Tanzania, Taiwan, United Kingdom, and EC reference and it was the lowest effective dose.