100KV CT CORONARY ANGIOGRAPHY FOR PROSPECTIVELY GATED AXIAL TECHNIQUE: IMAGE QUALITY AND RADIATION DOSE

Objective: To evaluate image quality and radiation dose for coronary artery computed tomographic angiography( CTA) obtained with low tube voltage for a prospectively gated axial( PGA) CT technique in low body mass index. Methods: Eighty patients enrolled in this study. The group A was 40patients with low BMI,HR and HRv using PGA scan technique( tube voltage was 120kV and tube current was 400mA). Image acquisition was performed at 75% of the R-R interval. The percentage of assessable coronary artery segments and radiation dose were used to evaluate diagnostic value. Results:527 coronary artery segments were depicted and evaluated. The percentage of assessable coronary artery segments was 99. 05%. The mean DLP and effective dose were( 91. 41 ± 13. 36) mGy ·cm,1. 58 ±0. 23mSv,respectively. Conclusion: Low tube voltage for PGA CT technique could offer assessable image quality and substantially reduced effective radiation dose at low HR and HRv.