联合80 kV管电压及Karl迭代重建降低320排CT腹部增强扫描辐射剂量的可行性研究  

Feasibility study of reducing radiation dose of enhanced abdominal examination in 320-row CT using 80 kV tube voltage combined with Karl iterative reconstruction

作　　者：曹建新 朱卓 许炜 李嘉帅 张清 CAO Jianxin;ZHU Zhuo;XU Wei;LI Jiashuai;ZHANG Qing(Department of Radiology,Wuhan Puren Hospital,Wuhan 430081,China)

机构地区：[1]武汉市普仁医院放射科,湖北武汉430081

出　　处：《实用放射学杂志》2024年第7期1170-1174,共5页Journal of Practical Radiology

基　　金：武汉科技大学职业危害识别与控制湖北省重点实验室开放基金项目(OHIC2021G04)。

摘　　要：目的探讨联合80 kV管电压及Karl迭代重建降低320排CT腹部增强扫描辐射剂量的可行性。方法100例体质量指数(BMI)<25.0 kg/m2的患者行320排CT腹部增强检查分为A、B 2组(每组50例)。A组采用120 kV管电压和滤波反投影(FBP)重建,B组采用80 kV管电压、FBP重建和Karl迭代重建。评估2组辐射剂量和图像质量。结果A组和B组单期扫描有效剂量(ED)分别为(11.0±1.7)mSv和(5.6±0.7)mSv(P<0.01),B组相对于A组下降49.1%。B组Karl图像噪声显著低于同组FBP图像(P<0.01),A组FBP图像和B组Karl图像间肝脏噪声无明显差异(P>0.05)。B组Karl图像与A组FBP图像相比,腹主动脉及门静脉主干噪声稍增加(P<0.05),相应信噪比(SNR)及对比噪声比(CNR)显著增加(P<0.01)。B组Karl图像肝脏、脾脏、胰腺、肾脏、胃肠道、腹主动脉、门静脉评分均明显高于B组FBP图像(P<0.01),A组FBP图像和B组Karl图像间肝脏、脾脏、胰腺、肾脏、胃肠道、腹主动脉评分均无明显差异(P>0.05),B组Karl图像门静脉评分高于A组FBP图像(P<0.05)。结论对于BMI<25.0 kg/m2的患者,联合80 kV管电压及Karl迭代重建能够显著降低320排CT腹部增强扫描的辐射剂量,并保持诊断需要的图像质量。Objective To explore the feasibility of decreasing radiation dose of enhanced abdominal examination in 320-row CT using 80 kV tube voltage combined with Karl iterative reconstruction.Methods One hundred patients with body mass index(BMI)<25.0 kg/m2 who underwent enhanced abdominal examination in 320-row CT were divided into group A and group B(50 patients for each group).120 kV tube voltage and filtered back projection(FBP)reconstruction were used for group A,while 80 kV tube voltage,FBP reconstruction and Karl iterative reconstruction were used for group B.Radiation dose and image quality between the two groups were evaluated.Results The effective dose(ED)were(11.0±1.7)mSv in group A and(5.6±0.7)mSv in group B for single scan(P<0.01).Compared with group A,the ED in group B was decreased by 49.1%.The noise on the Karl images in group B was significantly decreased compared with the FBP images in group B(P<0.01),and there was no significant difference in noise of liver between the FBP images in group A and the Karl images in group B(P>0.05).Compared with the FBP images in group A,the noise of abdominal aorta and portal vein on the Karl images in group B was slightly increased(P<0.05),while the signal-to-noise ratio(SNR)and the contrast-to-noise ratio(CNR)of abdominal aorta and portal vein on the Karl images in group B were significantly increased(P<0.01).Image quality scores for liver,spleen,pancreas,kidney,gastrointestinal tract,abdominal aorta and portal vein on the Karl images in group B were significantly higher than those on the FBP images in group B(P<0.01),and there was no significant difference in the image quality scores for liver,spleen,pancreas,kidney,gastrointestinal tract,and abdominal aorta between the FBP images in group A and the Karl images in group B(P>0.05),while the image quality score for portal vein on the Karl images in group B was higher than that on the FBP images in group A(P<0.05).Conclusion Radiation dose can be decreased obviously in 320-row CT enhanced abdominal examination using 80

关 键 词：管电压 迭代重建 计算机体层成像 辐射剂量 

分 类 号：R814.42[医药卫生—影像医学与核医学] R816.5[医药卫生—放射医学]