腹部横截面积调节管电压技术在CTU中的应用  

Effect of abdominal cross-sectional area adjusted tube voltage technique on image quality and radiation dose in MDCT urography

作　　者：赵海涛 杨峰 ZHAO Hai-tao;YANG Feng(Postgraduate Training Base of Jinzhou Medical University and Hubei University of Medicine, Hube 441000, China)

机构地区：[1]锦州医科大学湖北医药学院研究生培养基地,湖北襄阳441000 [2]湖北医药学院附属襄阳市第一人民医院放射科,湖北襄阳441000

出　　处：《影像诊断与介入放射学》2018年第2期107-111,共5页Diagnostic Imaging & Interventional Radiology

基　　金：湖北省教育厅科学技术研究计划项目(鄂教科B2015490)

摘　　要：目的探讨根据腹部横截面积调节管电压技术对CTU图像质量和辐射剂量的影响。方法对临床拟诊为泌尿系统疾病行CTU检查的患者89例,根据平第三腰椎横突水平腹部横截面积分为A组(大横截面积组):横截面积大于等于600 cm^2(30例);B组(中等横截面积组):介于400~600 cm2(30例);C组(小横截面积组):横截面积小于400 cm2(29例)。A、B、C三组排泄期图像管电压分别采用120、100和80 kV进行扫描,对扫描图像进行主观及客观评价,记录三组不同扫描方案的剂量长度乘积(DLP)和CT容积剂量指数(CTDI_(vol)),并计算有效辐射剂量(ED)。比较各组辐射剂量及图像质量的差异。结果 A、B、C三组有效辐射剂量(ED)分别为(5.82±0.58),(3.01±1.29)和(2.28±0.35)m Sv,差异有统计学意义(F=144.78,P<0.01)。Kappa一致性检验示A、B、C三组Kappa值均>0.70,两名医师对图像评价的一致性较高,A、B、C三组比较图像质量评分差异无统计学意义(H=1.58,P>0.05),各组的图像对比噪声比差异无统计学意义(F=0.25,P>0.05)。结论在CTU检查中,根据腹部横截面积调节管电压技术可以明显降低受检者的辐射剂量,而不影响图像的诊断质量。Objective To explore the feasibility of low-dose 320-slice CT urography（ MDCTU） based on abdominal cross section area. Methods 89 consecutive patients with suspected urologic diseases were randomly divided into 3 groups of large（S ≧600 cm^2, n=30）, medium（400 cm^2≤S600 〈cm^2, n=30） or small（S400 cm^2, n=29） areas according to abdominal cross sectional areas. MDCTU was acquired and image quality was qualitatively compared at 120, 100, 80 k V, respectively for the large, medium, and small cross sectional areas. The dose-length product（DLP） and CT dose index volume（CTDIvol） of the 3 groups were recorded and effective radiation dose（ED） were calculated and compared. Results The difference in the EDs was significant different（ F=144.78,P〈0.01） among the large（5.82 ±0.58 mSv）, medium（3.01 ±1.29 m Sv）, and small（2.28 ±0.35 mSv） cross sectional areas. The image quality scores determined by two physicians were highly consistent with each other（all κ〉0.70）. There was no significant difference in image quality（H=1.58, P〉0.05） and contrast to noise ratios among the 3 groups（F=0.25, P〉0.05）. Conclusion Abdominal cross-sectional area adjusted tube voltage technique in MDCTU can effectively reduce the effective radiation without compromising image quality.

关 键 词：泌尿系成像 辐射剂量体层摄影术 X线计算机 

分 类 号：R816.5[医药卫生—放射医学]