Coronary CT 검사시 SFOV 변화에 따른 환자선량 평가

Evaluation of Radiation Dose with Change of SFOV in Coronary CT Examination

Purpose The radiation dose in coronary study is high compared with other CT examination. Patient dose in CT is usually expressed in terms of the organ dose and effective dose. The purpose of this study is to evaluate patient organ dose and effective dose vary with scan fiend of view in coronary CT examination. Materials and Methods Organ dose was actually measured by using anthropomorphic phantom and Rapido-Photo-Luminescent(RPL) Glass. Effective dose measured by using ion chamber system. Results The survey on a patient dose showed that the organ dose was 98mGy in the heart part and 93mGy in the Lt. lung part and 63mGy in the Rt. lung part and 98mGy in the Lt. breast part and 75mGy in the Rt. breast part. Effective dose was 16.1mSv. Organ dose was decreased from 32.3% to 40.9% in used SS, S, M(SFOV) examination, compared to used L, LL(SFOV) examination. Effective dose was decreased 39.5% in used SS, S, M(SFOV) examination, compared to used L, LL(SFOV) examination. Conclusion As a conclusion, the radiation dose was very high dose in coronary study. Future research should be directed to identify the least amount of radiation required in CT scans to ensure that diagnostic performance is not significantly compromised.