CT质量控制检测分析

发布时间：2018-06-12 04:29

本文选题：CT机 + 质量保证　；参考：《中国医学装备》2016年01期

【摘要】：目的:利用国际通用的CT质量控制的检测方法对其进行质量检测,维持CT的正常运行,保证摄影图像质量。方法:选取日本东芝Activion 16排CT并设置扫描条件:管电压为120 k V,曝光量为310 m As,扫描时间为0.33 s,扫描层厚为10 mm、5 mm和1.5 mm,视野(FOV)为150mm×150 mm,重建矩阵512×512。采用美国模体实验室的Catphan500 CT检测体模对CT的空间分辨力、低对比度分辨力、均匀性和噪声进行检测。结果:被测CT的空间分辨力、低对比度分辨力、均匀性和噪声均符合要求。通过检测得出X射线剂量、像素及层厚对以上参数均有影响,且各参数之间相互影响。结论:通过对空间分辨力、低对比度分辨力等图像性能参数的检测,可有效保证系统性能,维持优化的图像质量。为了提高CT影像的图像质量和降低CT受检者的照射剂量,应定期对CT进行质量检测。
[Abstract]:Objective: to maintain the normal operation of CT and ensure the quality of photographic images by using the universal quality control method of CT. Methods: Toshiba Activion 16-slice CT was selected and the scanning conditions were as follows: the voltage of the tube was 120kV, the exposure was 310m as, the scanning time was 0.33s, the thickness of scanning slice was 10mm ~ 5mm and 1.5mm, the visual field was 150mm 脳 150mm, and the reconstruction matrix was 512 脳 512. The spatial resolution, low contrast resolution, uniformity and noise of CT were detected by Catphan500 CT in American Modal Laboratory. Results: the spatial resolution, low contrast resolution, uniformity and noise of CT met the requirements. It is found that X-ray dose, pixel and layer thickness have influence on the above parameters, and each parameter affects each other. Conclusion: the system performance can be effectively guaranteed and the optimized image quality can be maintained by detecting the image performance parameters such as spatial resolution low contrast resolution and so on. In order to improve the image quality of CT images and reduce the radiation dose of CT examinees, the quality of CT should be tested regularly.
【作者单位】：济南军区总医院医学工程科;
【分类号】：R812

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