Relationship between Tube Voltage kV Value for Coronary CTA and Body Weight
Objective This study aims to explore the relationship between KV value and body mass in coronary CTA imaging technology using low tube voltage scanning.Methods 120 patients with suspected coronary artery disease were selected as the research object,and all patients underwent coronary CTA.According to different kV values,they were divided into three groups:group A,120 kV(45 cases);Group B,100 kV(45 cases);80 kV in group C(30 cases).The patients in each group were divided into three levels according to their body weight:less than 70 kg,70-85kg,and＞85kg.Group C did not have＞85kg.The contrast agent used in all patients was iopromide(370 MGI/M1).The image quality and effective radiation dose of each individual quality level in each group were compared.Results Except for the 80kV group with a score of 2 at the level of 71-85kg,the subjective score of image quality of patients at all levels in other groups was＞3.The score of＞85kg in groups A and B and 70-85kg in group C was lower,which was significantly different from other groups.Similarly,patients with body weight＜70 kg had significantly different vascular CT values in different kV groups(all P＜0.001).The CT value of blood vessels of patients with 70-85kg body mass level in different kV groups was significantly different,and the differences were statistically significant(all P＜0.001).Similarly,patients with body mass＞85kg had significant differences in vascular CT values in different kV groups(all P＜0.001).The SNR and CNR of group B＞85kg and group C 70～85kg were lower than those of other groups,and the image quality was poor.Similarly,at the level of＜70 kg,the ED of 100kV group was 42.4％less than that of 120kv group,and that of 80kV group was 68.3％less than that of 120kv group(P＜0.001);Similarly,at the level of 70-85kg,the ED of 100kV group was reduced by 40.4％compared with that of 120kv group,and that of 80kV group was reduced by 68.3％compared with that of 120 group(P＜0.001);Similarly,the ED of＞85kg level in 100kV group was 40.8％lower than that in 120kv group(P＜0.001).Conclusion in coronary CTA imaging,80 kV dose for patients with body weight＜70 kg and 100 kV dose for patients with body weight 70～85kg can obtain image quality equivalent to 120 kV dose,and can effectively reduce the radiation dose.
CTACoronary CTABody Mass IndexRadiation DosageImage ProcessingTube Voltage
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