CT层厚的测量技术及其相关影响因素研究

Study on the measurement technology for CT slice thickness and pertinent parameters

目的 :测量CT的层厚 ,探讨与层厚相关的各项参数。方法 :采用 3种不同的方法对 10台CT进行测试 ,计算出CT的层厚并测量了不同层厚条件下CT的噪声和空间分辨力。结果 :3种测试方法各有优缺点 ,有多种因素影响CT层厚。结论

Objective:To study the measurement technique of slice thickness of CT scanners, and discuss pertinent parameters.Methods:three different methods were used and compared to measure and calculate CT slice thickness in 10 sets of computed tomography scanners, and the other parameters such as noise and spatial resolution were also measured.Results:the methods used have their own advantages and disadvantages.There were many parameters affecting CT slice thickness.Conclusions:CT slice thickness must be measured and calibrated to assure the precision of the CT scanner. Key words :Slice thickness Method Phantom incoordination of stomach.③moderate gastric retention but with normal emptying of liquid.④no gastric stenosis or obstruction.Conclusions:The main cause of postoperative functional abnormality in alimentary tract is the injury of vagus or sympathetic nerve. Upper GI series can reveal its X ray feature and differentiate it from organic lesions of gastro intestinal tract.