【摘要】 CT扫描的图像质量与设置的参数和开机时间有关，扫描参数不同导致扫描结果不同，开机时间对系统稳定性有一定影响，从而导致CT图像质量有差异。本文采用高分辨综合扫描分析系统nanoVoxel-2792扫描混凝土试件，对比不同管电压、管电流和设备开机时间对CT图像质量的影响。结果表明，不同管电压、管电流扫描的图像质量存在差异，电压值越高，图像对比度越高，环状伪影越不明显，噪声越少；管电流对图像质量影响较小，电流值越大图像质量越好。型号为nanoVoxel-2792的显微CT,管电压设置为130kV,管电流设置为100μA时扫描结果最好，CT开机时间对图像质量影响较小，开机2h后系统更加稳定。更多还原

【Abstract】 The image quality of CT scanning is related to the parameters set and the startup time. Different scanning parameters lead to different experimental results, and the startup time has a certain impact on the system stability, resulting in differences in CT image quality. A high-resolution comprehensive scanning analysis system nanoVoxel-2792 was used to scan concrete specimens, and the effects of different tube voltages, tube currents and equipment start-up time on CT image quality were compared. The results show that the image quality varies with different tube voltages and currents. The higher the voltage, the higher the image contrast, the less obvious ring artifacts and the less noise. Tube current has little influence on image quality, and the larger the current value, the better the image quality. NanoVoxel-2792 CT with tube voltage set at 130kV and tube current set at 100μA has the best scanning results. The CT startup time has little influence on image quality, and the system is more stable after 2 hours of startup.更多还原