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目的 :测量CT设备的CT值线性 ,评价物质材料的CT值 (测量值 )对其衰减系数 μ是否满足线性关系。 方法 :利用Catphan体模对 18台CT设备进行测试 ,计算出CT值线性。 结果 :18台设备中有 14台设备的CT值线性达到指标 ,其余 4台则有所偏移。结论 :(1)有多种因素影响CT值线性 ,且CT值线性不好会导致图像的伪影。 (2 )必须定期对CT值线性这项参数进行校正 ,确保其稳定性 ,以利于设备的正确诊断。
Purpose : To measure the linearity of the CT value of the CT equipment and to evaluate whether the CT value (measurement value) of the material material has a linear relationship with the attenuation coefficient μ. Methods : 18 CT devices were tested with Catphan phantoms, and CT values were calculated linearly. Results: The CT values of 14 of the 18 devices were linearly up to the index, while the remaining 4 were offset. Conclusions: (1) There are many factors that affect the linearity of the CT value, and the CT value is not good linearity will lead to image artifacts. (2) The parameter CT linearity must be corrected regularly to ensure its stability in order to facilitate the correct diagnosis of the equipment.