儿童眼眶低剂量双螺旋CT轴位扫描多平面重组的临床应用  

Study of Low Dose Axial Scan of Pediatric Orbit with 2-slice Spiral CT Multiplanar Reconstruction

作　　者：韦永南[1] 赵浙民[1] 刘煜[2] 齐荣秀[1] 劳美新[1] 廖源[1] 

机构地区：[1]广州中医药大学附属南海妇产儿童医院放射科,广东佛山528200 [2]广州中医药大学附属南海妇产儿童医院眼科,广东佛山528200

出　　处：《现代医用影像学》2015年第6期951-954,共4页Modern Medical Imageology

基　　金：广东省佛山市科技攻关项目(编号:200908116)

摘　　要：目的：探讨儿童眼眶低剂量双螺旋轴位扫描多平面重组技术的可行性和合理的扫描参数。材料与方法：40例正常或轻度鼻窦炎年龄1~15岁儿童按扫描参数随机分为4组,每组10例。第1~3组电压120k V,电流分别为100m As、50m As、30m As;第4组电压100k V,电流30m As。比较各组图像质量有无差异。结果：第2~4组的容积CT剂量指数（CTDIvol）与第1组的CTDIvol比较分别减少50%、70%、82%。4组图像质量评分结果之间有显著差异性（x2=57.25,p〈0.01）;其中,第2组与第1组比较图像质量评分之间无显著差别（x2=0.53,p〉0.01）;第3、4组与第1组比较图像质量评分之间有显著差别（x2=28.67、51.52,p〈0.01）。结论：儿童眼眶低剂量双螺旋轴位扫描多平面重组是可行性的,扫描参数低至120k V,50m As,CTDIvol 7.7m Gy可满足临床诊断要求。Purpose： To study the application of low-dos 2-slice spiral CT scan technique in examining pediatric Orbit. Materials and Methods： 40cases of children with normal paranasal sinus and mild paranasal sinusitis examined by Philips MX4000 Dual CT were collected. These cases were divided into 4 groups （ each group 10cases）, group 1, 2, 3 were scaned by 120kV, 100mAs, 50mAs, 30mAs; group 4 by 100kV, 30mAs. Other scan parameters were fixed. Image quality of each group was compare by using Kruskal-Walls test and Nemenyi test to see whether there was difference between varied groups. Results： compared with group 1, CTDIvol of group 2 to 4 were reduced by 50%, 70%, 82%, respectively. No significant difference was found between group 1 and group 2 （ x2 = 0. 53, p 〉 0. 01 ） but there was significant difference be- tween group 1 and group 3 to 4 （x2 = 28. 67, 51.52, p 〈 0. 01 ）. Conclusion： Low dose 2-slices spiral CT scanning can be used in the Orbital examinations of children, Low dose CT scan with 120kV, 50mAs （CTDIvol 12. 9mGy） can satisfy the di- agnostic requirements.

关 键 词：眼眶 儿童 双螺旋CT 低剂量 多平面重组 

分 类 号：R816.97[医药卫生—放射医学]