CAJ | 학술논문

目的:探讨80 kV管电流调制技术冠状动脉CT成像在正常BMI受检者中应用的可行性.方法:收集140例行冠状动脉 CTA 检查的患者.所有受检者 BMI 均小于25 kg/m2.随机分为2组,即80 kV组和120 kV组,在这2组内部分受检者又联合采用管电流调制技术扫描.由2位医师行双盲、随机方法对各组图像评分.客观测量信噪比、对比噪声比及辐射剂量.结果:80 kV组客观图像质量均低于120 kV 组(P 值均<0.05),而2组图像质量主观评分并未见明显差异(P>0.05).采用80 kV组其辐射剂量较120 kV组减少约12 mSv,而联合应用管电流调制技术可减少剂量高达82%(P<0.05).结论:对于BMI指数小于25 kg/m2受检者,采用80 kV管电压联合管电流调制技术可有效降低辐射剂量且不损害主观图像质量.
목적:탐토80 kV관전류조제기술관상동맥CT성상재정상BMI수검자중응용적가행성.방법:수집140례행관상동맥 CTA 검사적환자.소유수검자 BMI 균소우25 kg/m2.수궤분위2조,즉80 kV조화120 kV조,재저2조내부분수검자우연합채용관전류조제기술소묘.유2위의사행쌍맹、수궤방법대각조도상평분.객관측량신조비、대비조성비급복사제량.결과:80 kV조객관도상질량균저우120 kV 조(P 치균<0.05),이2조도상질량주관평분병미견명현차이(P>0.05).채용80 kV조기복사제량교120 kV조감소약12 mSv,이연합응용관전류조제기술가감소제량고체82%(P<0.05).결론:대우BMI지수소우25 kg/m2수검자,채용80 kV관전압연합관전류조제기술가유효강저복사제량차불손해주관도상질량.
Objectlve:To assess the image quality and radiation dose of 80 kV electrocardiography (ECG)-gated CCTA in subjects with a normal body mass index (BMI), compared to 120 kV ECG-gated CCTA. Method:The CCTA images of 140 subjects with BMIs <25 kg/m2 were analyzed. Seventy subjects underwent 120 kV CCTA, and the other 70 subjects underwent 80kV CCTA. Two blinded observers independently evaluated the subjective image quality of the coronary arteries. The objective image quality (signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR)) and radiation dose were also measured in each group. Results: Although the objective image quality of the 80 kV protocol images was significantly poorer than that of 120 kV protocol images (P<0.05), there was no significant difference in the subjective image quality between the two groups (P>0.05). The radiation dose was reduced by 12mSv with the 80 kV protocol and by 82%with the 80 kV and ECG-based tube current modulation than one with the 120 kV protocol (P<0.05). Conclusion:The low tube voltage CCTA protocol using 80 kV allows significant reduction of the radiation dose without impairing the subjective image quality in subjects with normal BMIs.