常规固定能量的X射线成像方法, 对于厚薄差异大的工业复杂异形工件, 因成像系统动态范围受限, 易出现过曝光和欠曝光共存现象, 信息缺失, 成像质量差。 为此提出研究变能量X射线多谱成像方法, 在常规的射线成像系统上, 依据有效厚度与电压的匹配性改变X射线管电压, 获取递变电压下的多谱图像序列, 同时研究多谱序列信息提取与融合技术, 实现射线图像动态范围的扩展, 完整地再现复杂结构件的内部结构信息。 实验表明, 相对于12 bit的成像系统, 变能量X射线多谱成像方法有效地将系统动态范围扩展了3倍, 实现了复杂结构件的X射线高动态成像。

In conventional X-ray imaging based on fixed energy, the ray image of the complicated structural component often appears overexposed or underexposed. This is because of the variations in the effective thickness of the component along the orientation of the X-ray penetration that exceed the limit of the dynamic range of the X-ray imaging system. Complete structural information cannot be obtained, and this lack will impact the quality of the X-ray image. To solve this problem, the technology of X-ray multispectrum imaging based on variable energy has advanced. In this new method, the tube voltage is adjusted several times to accommodate the full necessary range of effective thickness, and then, the extracted images are fused to reconstruct the full projection information. Experiment shows that for the 12 bit imaging system, the new technology makes the system’s dynamic range expand 4 times, also completely represent the internal structure information of a complicated structural component.