X射线仿真软件通过读取物体三维模型，基于射线衰减及成像理论，计算得到理想探测器成像的射线图像。由于射线机、胶片、环境等方面与实际检测相比存在着一定的差异，导致射线仿真软件成像与实际检测图像的黑度上不一致。以X射线仿真软件(X-RAY Simulation)为例，通过对比它与真实X射线机对钛合金零件曝光图像的黑度差异，利用软件自带的修正功能制作出修正系数曲线对仿真图像的黑度进行修正。试验证明最大黑度差由1左右降至0.3。

Radiography Simulation Software produces simulated radiograph by loading three-dimensional data of the part to be inspected and by calculating based on X-ray attenuation and imaging theory. However, there are some differences between the simulated images and real images due to variation of ray-machine, film, environment and other factors. In this paper, the differences of density between simulated and real images were investigated by using software of XRSIM. Correction factor curve was made to correct the densityof simulated X-ray radiograph. Experimental results show that the biggest differencesof density are decreased from 1.0 to 0.3.