自动管电流调节联合低电压低剂量扫描技术在幼儿胸部CT扫描中的优化应用研究  

Low-Dose Chest CT Scan Technique Using Automatic Tube Current Modulation Combined with Low Voltage:an Optimized Study in Small Infants

作　　者：张晓军[1] 朱斌[2] 郑晓波[1] 戴石[1] 唐文伟[1] 杨明[1] 

机构地区：[1]南京医科大学附属南京儿童医院放射科,210009 [2]南京医科大学鼓楼临床医学院医学影像科,210008

出　　处：《临床放射学杂志》2016年第6期946-949,共4页Journal of Clinical Radiology

基　　金：南京市医学科技发展资金资助项目(编号:QYK11151)

摘　　要：目的探讨64层CT自动管电流调节技术(ATCM)结合低电压在幼儿胸部低剂量扫描中的应用价值。方法搜集行64层CT ATCM胸部扫描的幼儿(≤2岁)48例,其中A组(管电压100 k V)30例,B组(管电压80k V)18例;并与既往采用固定管电流条件下的低剂量扫描数据进行对比分析,对照组C组(100 k V/60 m As)30例;其余扫描参数一致。记录每次扫描的平均管电流(m As)、CT容积剂量指数(CTDIvol)、剂量长度值(DLP),计算出有效剂量(ED)及剂量减低比值(DR),并比较3组的剂量及图像质量。结果 A组CTDIvol为(1.11±0.19)m Gy,B组CTDIvol为(0.99±0.11)mGy,C组CTDIvol为(2.38±0.00)m Gy;3组数据两两比较差异均有统计学意义(P<0.05)。A组相对C组DR约51.07%,B组相对C组DR降低约58.20%。3组图像质量均满足诊断要求,差异无统计学意义(P=0.50)。结论低电压联合ATCM技术在幼儿胸部扫描中可以广泛应用,能够有效降低辐射剂量且不影响图像质量。Objective To investigate the feasibility of radiation dose reduction in infants chest CT scanning using automatic tube current modulation（ATCM） combined with Low voltage.Methods 48 patients（≤2 years old） who underwent chest CT scan of ATCM in our hospital weredivided into group A of 30 cases（tube voltage of 100 kV） and group B of18 cases（tube voltage of 80 kV）,control group（group C） of 30 cases who underwent low-dose chest scan of fixed tube current（100 kV /60 m As） in our hospital,other scanning parameterswere the same.Group A and B were compared with group C.The average tube current（m As）,The volume CT dose index（CTDIvol）,dose length product（DLP）,the effective dose（ED） and the dose reduction（DR） were Recorded to compare the dose and image quality of the three groups.Results The values of CTDIvol of group A,group B and group C were（1.11 ± 0.19） m Gy,（0.99 ± 0.11） m Gy and（2.38 ± 0.00） m Gy,respectively.There were statistically significant differences between the three groups（P 〈0.05）.in comparison to group C; DR value of group A was about 51.07% and DR value of group B was about 58.20%.The image quality of the three groups fulfilled the diagnostic requirements of doctors,there were no statistically significant differences（P = 0.50）.Conclusion Low voltage combined ATCM technology can be widely used in infant chest scans,it can effectively reduce the radiation dose without compromising image quality.

关 键 词：自动管电流调节 辐射剂量 幼儿 体层摄影术 X线计算机 

分 类 号：R816.92[医药卫生—放射医学]