腹部CT低剂量扫描的应用研究  

Experimental Study on the Influencing Factors of Abdominal Low Dose CT Image Quality

作　　者：刘师竺 赵静霞[3] 胡博奇[1] 于喜坤 张健 魏宇林 刘景鑫[1,2] LIU Shizhu;ZHAO Jingxia;HU Boqi;YU Xikun;ZHANG Jian;WEI Yulin;LIU Jingxin(Department of Radiology, China-Japan Union Hospital, Jilin University, Changchun Jilin 130033, China;Jilin Province Engineering Research Center of Medical Imaging, Changchun Jilin 130033, China;Experimental Teaching Center of College of Nursing, Jilin University, Changchun Jilin 130021, China;Changchun City Metrology and Testing Technology Research Institute, Changchun Jilin 130012, China)

机构地区：[1]吉林大学中日联谊医院放射线科,吉林长春130033 [2]吉林省医学影像工程技术研究中心,吉林长春130033 [3]吉林大学护理学院实验教学中心,吉林长春130021 [4]长春市计量检定测试技术研究院,吉林长春130012

出　　处：《中国医疗设备》2019年第4期9-13,共5页China Medical Devices

基　　金：国家重点研发计划(2016YFC0103500);吉林省省校共建项目(SXGJXX2017-5);吉林大学高层次科技创新团队建设项目(2017TD-27);吉林省标准化战略科研专项(BZKY1802)

摘　　要：目的通过实验研究腹部低剂量CT影像质量影响因素。方法采用不同直径模体,不同的mA值、kV值、层厚、螺距等扫描参数,分别对不同厂家、型号CT进行扫描,测量其数据并进行大量统计分析。结果当毫安秒小于50 mAs时,低对比分辨力不能符合标准;当毫安秒大于75 mAs时,噪声的变化趋于平缓。所以在保证影像质量的前提下,腹部CT低剂量扫描的阈值为75 mAs。结论影响腹部低剂量CT影像质量的因素有很多,正确全面地理解,对于做好CT的质量控制及保证工作十分重要。Objective The factors affecting the quality of low-dose CT imaging in the abdomen were studied experimentally. Methods Phantoms of different diameter were scanned using CT of diverse manufactures and models with distinct scanning parameters such as mA value, kV value, thickness and pitch. Data was acquired and statistically analyzed. Results When mAs was less than 50 mAs, the low contrast resolution could not meet the standard. When mAs was greater than 75 mAs, the fluctuation of noise tended to be flat. Therefore, to ensure image quality, the threshold value of low-dose abdominal CT scanning was 75 mAs. Conclusion There are many factors affecting the quality of low-dose abdominal CT images. A correct and comprehensive understanding of these factors is very important to the quality control and assurance of CT scanning.

关 键 词：腹部 低剂量 阈值 CT 模体 

分 类 号：R445.2[医药卫生—影像医学与核医学]