CAJ | 학술논문

目的：评价70 kV管电压CT血管成像在诊断儿童胡桃夹综合征中的应用价值。方法：27例临床疑似胡桃夹综合征的患者进行了新双源CT 70 kV CT动静脉混合期血管成像（70 kV组），另37例患者行120 kV腹部增强双期扫描（120 kV组）。测量患者左肾静脉、肠系膜上动脉、腹主动脉、腰大肌的CT值及皮下脂肪的标准差并计算图像的信噪比（SNR）和对比噪声比（CNR）。两名放射科医师对所有病例以四分法进行评分。计算有效剂量（ED）。比较两组间的图像质量及辐射剂量。结果：70 kV组左肾静脉的CT 值、SNR 及 CNR 明显高于120 kV 组，差别有统计学意义（P＜0．01），70 kV组肠系膜上动脉、腹主动脉的CT值、SNR及CNR与120 kV动脉期组比较差别无统计学意义（P＞0．05），与120 kV静脉期组比较明显提高，差别有统计学意义（P＜0．001）。70 kV组图像质量主观评分高于120 kV组，与120 kV动脉期组比较差别无统计学意义（P＝0．137），与120 kV 静脉期组比较差别有统计学意义（P＜0．001）。70 kV 组辐射剂量与120 kV组比较明显降低，有效辐射剂量降低了93．7％，差异有统计学意义（P＜0．001）。结论：临床疑似胡桃夹综合征的儿童70 kV动静脉混合期CT血管成像在保证图像质量满足诊断的同时大幅降低了辐射剂量。
목적：평개70 kV관전압CT혈관성상재진단인동호도협종합정중적응용개치。방법：27례림상의사호도협종합정적환자진행료신쌍원CT 70 kV CT동정맥혼합기혈관성상（70 kV조），령37례환자행120 kV복부증강쌍기소묘（120 kV조）。측량환자좌신정맥、장계막상동맥、복주동맥、요대기적CT치급피하지방적표준차병계산도상적신조비（SNR）화대비조성비（CNR）。량명방사과의사대소유병례이사분법진행평분。계산유효제량（ED）。비교량조간적도상질량급복사제량。결과：70 kV조좌신정맥적CT 치、SNR 급 CNR 명현고우120 kV 조，차별유통계학의의（P＜0．01），70 kV조장계막상동맥、복주동맥적CT치、SNR급CNR여120 kV동맥기조비교차별무통계학의의（P＞0．05），여120 kV정맥기조비교명현제고，차별유통계학의의（P＜0．001）。70 kV조도상질량주관평분고우120 kV조，여120 kV동맥기조비교차별무통계학의의（P＝0．137），여120 kV 정맥기조비교차별유통계학의의（P＜0．001）。70 kV 조복사제량여120 kV조비교명현강저，유효복사제량강저료93．7％，차이유통계학의의（P＜0．001）。결론：림상의사호도협종합정적인동70 kV동정맥혼합기CT혈관성상재보증도상질량만족진단적동시대폭강저료복사제량。
Objective:To assess the diagnostic value of CT angiography at 70kV in children with nutcracker syn-drome.Methods:27 subjects with clinically suspected nutcracker syndrome underwent CT scanning at 70kV (70kV group) and the other 37 subjects underwent CT dual-phase abdominal enhancement scanning at 120kV (120kV group).The CT values of left renal vein,superior mesenteric artery,abdominal aorta,psoas muscle and the standard deviation of subcutane-ous fat were measured and the signal-to-noise ratio (SNR)and contrast-to-noise ratio (CNR)of the images were also calcu-lated for each patient.Two radiologists evaluated the image quality using a 4-point scale and calculated each effective dose (ED).The differences of radiation dose and image quality between two groups were compared.Results:The 70kV group showed higher CT values,SNR and CNR of left renal vein than the 120kV group (P<0.01),and the CT values,SNR and CNR of superior mesenteric artery and abdominal aorta in 70kV group were significantly higher than those in 120kV venous phase group (P<0.001),but there was no statistical difference between 70kV group and 120kV arterial phase group (P>0.05).The subjective score of image quality in 70kV group was higher than 120kV group,but there was no significant difference between 70kV group and 120kV arterial phase group (P= 0.137),while there was significant difference between 70kV group and 120kV venous phase group (P<0.001).Compared with 120KV group,the radiation dose was significantly lower in 70kV group,and the effective radiation dose was reduced by 93.7% (P<0.001).Conclusion:70kV mixed phase CT angiography can effectively reduce the radiation dose while maintaining image quality in children with clinically suspec-ted nutcracker syndrome.