呼吸频率及螺距对儿童胸部CT图像质量和辐射剂量的影响  

The effect of respiratory rate and pitch on chest CT image quality and radiation dose of children

作　　者：边传振 张楠[1] 刘鹏[1] BIAN Chuan-zhen;ZHANG Nan;LIU Peng(Children’s Hospital Affiliated to Nanjing Medical University, Nanjing 210000, China)

机构地区：[1]南京医科大学附属儿童医院

出　　处：《中国临床医学影像杂志》2019年第7期468-471,共4页Journal of China Clinic Medical Imaging

摘　　要：目的:探讨在儿童胸部CT检查过程中,患儿的呼吸频率与扫描螺距之间的关系并评价它们对图像质量和辐射剂量的影响。方法:将85例患儿随机分配到AB两组,再根据呼吸频率的不同将分别将AB两组患儿分别再分为A1、A2组和B1、B2组,A组患儿采用较大螺距进行扫描,B组患儿采用较小螺距进行扫描,记录患儿的CTDIvol以及DLP,并对患儿的CT图像质量进行客观及主观评价。结果:A组患儿的图像质量优于B组,特别是A1组患儿图像质量远优于B1组;A2和B2两组的患儿图像质量差异无统计学意义;A组患儿的平均DLP比B组患儿高18.5%,而CTDIvol差异无统计学意义。结论:儿童胸部CT检查时对于低频呼吸的患儿,采用小螺距扫描参数能够在保证图像质量的前提下,降低患儿的辐射剂量。Objective: To investigate the relationship between the respiratory rate and the scanning pitch when performing chest CT scan and evaluate their effect on image quality and radiation dose. Methods: Eighty-five patients were divided into group A and B randomly. According to their respiratory rate, patients in group A were divided into A1 and A2 group;patients in group B were divided into B1 and B2 group. In group A, high-pitch mode CT scan was performed;in group B, low-pitch mode CT scan was performed. The CTDIvol and DLP were recorded, and the image quality was evaluated subjectively and objectively. Results: Image quality of group A was better than that of group B;the difference was more obvious in A1 and B1 group;the CTDIvol was not significantly different in group A and group B, but the mean DLP value was 18.5% higher in group A than group B. Conclusion: Low-pitch mode CT scan was more suitable for low RRs patients when performing chest CT scan, that will reduce radiation dose while maintaining preferable image quality. Low-pitch mode CT scan was more suitable for low RRs patients when performing chest CT scan, which will reduce radiation dose while maintaining preferable image quality.

关 键 词：胸部疾病 儿童 体层摄影术 螺旋计算机 

分 类 号：R655[医药卫生—外科学] R339.31[医药卫生—临床医学]