CAJ | 학술논문

目的：探讨三维自适应迭代剂量降低算法（3D AIDR）对超重患者640层冠状动脉CT血管造影（CTA）的图像质量及辐射剂量的影响。方法连续80例疑似冠心病的超重患者（30kg/m2≥BMI≥25.0kg/m2）以随机数字表法分成A、B两组，行前瞻性心电门控扫描。A组以120 kV管电压扫描，原始数据分别以FBP（A1组）和3D AIDR（A2组）重建图像；B组以100 kV管电压扫描，原始数据以FBP（B1组）和3D AIDR（B2组）重建图像。2位放射科医师以5分法评价15个冠状动脉节段的图像质量。比较A组和B组各亚组间的噪声（SD）及平均CT值（SI）、信噪比（SNR）、对比信噪比（CNR）和有效辐射剂量。结果 B组有效辐射剂量较A组减少了46％。A组和B组各亚组间的图像质量得分差异均有统计学意义（均P＜0.05），A1与B2组的图像质量得分差异无统计学意义（P＞0.05）。A组各亚组间SD、SNR、CNR比较差异均有统计学意义（均P＜0.05）。B组各亚组间SD、SNR、CNR比较差异均有统计学意义（均P＜0.05），B2组与A1组SI差异有统计学意义（P＜0.05），SD、SNR、CNR差异均无统计学意义（均P＞0.05）。结论3D AIDR联合100kV低剂量扫描在保持适合诊断的冠状动脉图像质量的同时能大幅度降低CTA辐射剂量。
목적：탐토삼유자괄응질대제량강저산법（3D AIDR）대초중환자640층관상동맥CT혈관조영（CTA）적도상질량급복사제량적영향。방법련속80례의사관심병적초중환자（30kg/m2≥BMI≥25.0kg/m2）이수궤수자표법분성A、B량조，행전첨성심전문공소묘。A조이120 kV관전압소묘，원시수거분별이FBP（A1조）화3D AIDR（A2조）중건도상；B조이100 kV관전압소묘，원시수거이FBP（B1조）화3D AIDR（B2조）중건도상。2위방사과의사이5분법평개15개관상동맥절단적도상질량。비교A조화B조각아조간적조성（SD）급평균CT치（SI）、신조비（SNR）、대비신조비（CNR）화유효복사제량。결과 B조유효복사제량교A조감소료46％。A조화B조각아조간적도상질량득분차이균유통계학의의（균P＜0.05），A1여B2조적도상질량득분차이무통계학의의（P＞0.05）。A조각아조간SD、SNR、CNR비교차이균유통계학의의（균P＜0.05）。B조각아조간SD、SNR、CNR비교차이균유통계학의의（균P＜0.05），B2조여A1조SI차이유통계학의의（P＜0.05），SD、SNR、CNR차이균무통계학의의（균P＞0.05）。결론3D AIDR연합100kV저제량소묘재보지괄합진단적관상동맥도상질량적동시능대폭도강저CTA복사제량。
Objective To investigate the image quality and radiation dose of CT coronary angiography using 3D adaptive iterative dose reduction in overweight patients. Methods Eighty consecutive overweight patients with suspected coronary artery disease underwent coronary CT angiography with 640- slice CT scanner, the patients were randomly divided into two groups:the tube voltage was 120 kV in group A and 100 kV in group B. Al raw data were reconstructed by software FBP and 3D AIDR in CT system and two new subgroups in group A and B were created (A1, A2 and B1, B2), respectively.The values SI, SD, SNR, CNR, and image quality scores were compared between subgroups A1 and A2, and subgroups B1 and B2. The values of SI, SD, SNR, CNR and image quality scores were also compared between B2 and A1. Results The value of E in group B was decreased by 46%compared to group A.There was significant difference in mean image quality scores between groups A1 and A2 (P<0.05) and between groups B1 and B2 (P<0.05). There was no significant difference in mean image quality scores between groups A1 and B2. The values of SD in group A1 were significantly higher and SNR and CNR were lower than those in group A2 (P<0.05). The values of SD in group B1 were significantly higher and SNR and CNR were lower than those in group B2(P<0.05). There was significant difference in SI between group A1 and group B2 (P<0.05), but no difference in SD, SNR, CNR between two groups (P>0.05). Conclusion The 3D AIDR reconstruction algorithm can significantly improve the image quality of coronary artery in the equivalent dose, which are helpful for the image interpretable in the low dose for overweight patients.