CAJ | 학술논문

目的：利用双源CT（dual source computed tomography，DSCT）探讨低千伏在上腹部增强扫描中的应用价值。方法选择40例患者行DSCT上腹部强化扫描扫描，其中男22例，女18例。扫描完成后取得3组数据， A组融合图像（相当于120 kV）重建函数为D30（反投影滤过重建算法），B组和C组为80 kV数据，重建函数分别为D30和I30（迭代重建算法）。3组数据的动脉期及门静脉期图像分别测量腹主动脉、门静脉主干、肝脏、脾脏、胰腺、腹膜后脂肪及肌肉的平均CT值及噪声，并计算信噪比（SNR）。对3组影像质量评级评分。结果A组和C组的噪声比较差异无统计学意义（ P ＞0．05），且均高于B组（ P ＜0．05）；门静脉主干、主动脉、脾脏的平均CT值B组和C组差异无统计学意义（ P ＞0．05），高于A组（ P ＜0．05）；门静脉主干、主动脉、脾脏的SNR A组和B组差异无统计学意义（ P ＞0．05），均低于C组（ P ＜0．05）。肝脏、胰腺的平均CT值3组差异无统计学意义（ P ＞0．05），A、C组SNR差异无统计学意义（ P ＞0．05），且均高于B组（ P ＜0．05）。 A组和C组图像满足诊断率均为100％，高于B组（ P ＜0．05）。结论80 kV管电压结合迭代重建算法可得到质量满意的上腹部强化扫描图像。
목적：이용쌍원CT（dual source computed tomography，DSCT）탐토저천복재상복부증강소묘중적응용개치。방법선택40례환자행DSCT상복부강화소묘소묘，기중남22례，녀18례。소묘완성후취득3조수거， A조융합도상（상당우120 kV）중건함수위D30（반투영려과중건산법），B조화C조위80 kV수거，중건함수분별위D30화I30（질대중건산법）。3조수거적동맥기급문정맥기도상분별측량복주동맥、문정맥주간、간장、비장、이선、복막후지방급기육적평균CT치급조성，병계산신조비（SNR）。대3조영상질량평급평분。결과A조화C조적조성비교차이무통계학의의（ P ＞0．05），차균고우B조（ P ＜0．05）；문정맥주간、주동맥、비장적평균CT치B조화C조차이무통계학의의（ P ＞0．05），고우A조（ P ＜0．05）；문정맥주간、주동맥、비장적SNR A조화B조차이무통계학의의（ P ＞0．05），균저우C조（ P ＜0．05）。간장、이선적평균CT치3조차이무통계학의의（ P ＞0．05），A、C조SNR차이무통계학의의（ P ＞0．05），차균고우B조（ P ＜0．05）。 A조화C조도상만족진단솔균위100％，고우B조（ P ＜0．05）。결론80 kV관전압결합질대중건산법가득도질량만의적상복부강화소묘도상。
Objective To investigate the application value of dual source computed tomography (DSCT) with low tube voltage in enhancement scanning in epigastric region .Methods Forty patients (22 males & 18 females) underwent contrast-enhanced abdominal DSCT .The obtained data were reconstructed as three groups:group A,fused image reconstructed with D30 ( filter back projection FBP) ;group B,80kV image reconstructed with D30 and group C,80kV image reconstructed with I30 (iterative reconstruction IR).The mean CT numbers,noise and SNR of abdominal organs were assessed quantitatively and qualitatively in each group .The image quality was scored in three groups .Results There was no significant difference in noise between group A and group C ( P >0.05),however,which in both groups was obviously higher than that in group B (P <0.05).There was no significant difference in CT average value in main portal vein ,aorta and spleen between group B and group C ( P >0.05),however,which in both groups was significantly higher than that in group A ( P <0.05).There was no significant difference in SNR in main portal vein ,aorta and spleen between group A and group B ( P >0.05),however, which in both groups was significantly lower than that in group C ( P <0.05).There was no significant difference in CT average value in liver and pancreas among three groups ( P >0.05).There was no significant difference in SNR between group A and group C ( P >0.05),however,which in both groups was significantly higher than that in group B ( P <0.05). The image satiation diagnostic rate in group A and group C was 100%,which was significantly higher than that in group B (P <0.05).Conclusion The iterative reconstruction method with 80kV tube voltage can obtain satisfactory enhancement scanning image in epigastric region.