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分析了直接数字减影法中不能完全消除与血管重叠的其他组织的影像问题 ,从理论和实验上提出了解决该问题的方法 .按照X线在人体组织中的吸收特点 ,建立了以“等效单能”模型为基础的X线成像模型 .在实际进行减影前 ,按照此关系对X线图像进行一定的灰度变换 ,减影结果就可以极大程度地消除血管以外的其他组织的影像 .实验结果证明了这种方法的有效性 .
Analyzed the direct digital subtraction method can not completely eliminate the vascular overlap with other tissue imaging problems, from the theoretical and experimental methods to solve this problem.According to X-ray absorption characteristics in human tissues, established a " Effective single-energy model based on the X-ray imaging model in the actual reduction before subtraction, according to the relationship of the X-ray images of a certain degree of gray-scale transformation, subtraction results can greatly eliminate blood vessels other than the organization The experimental results demonstrate the effectiveness of this method.