肝脏动、静脉相CT图像配准与融合方法研究

Research on registration and fusion of CT liver images in artery and vein phase

目的研究肝脏CT扫描序列图像轮廓提取、配准与融合问题。方法采用图像滤波去噪、增强图像边缘及提取图像外轮廓等方法对CT序列图像进行预处理。对肝脏CT扫描序列图像动脉相位期与静脉相位期的图像轮廓进行配准，选取最优配准参数确定不同相位期图像的对应关系，以实现配准。将配准后对应的动、静脉相位期图像融合。结果融合后的图像展现了同一位置不同相位期肝脏动、静脉的情况。结论配准、融合后的图像能提供更加丰富的信息，可为医生临床诊断提供参考。

Objective To study the extraction, registration and fusion of the image contour of liver CT scan sequence. Methods Filtering method was used to remove the noise and enhance the edge of the image, and then the contour of the CT image was extracted. According to the optimal registration parameters, the hepatic arterial phase and venous phase images were registered, and the corresponding relationship between the arterial and venous images was determined. At last, the CT images of the arterial and venous phase were fused. Results After fusing the corresponding arterial and venous images, condition of liver artery and vein of the same cross section in different phase periods could be observed. Conclusions Fused image can offer richer image information to doctors for diagnosis.