基于方向滤波器组的造影图像血管增强方法

摘要

为了便于医生观察冠脉造影图像，更准确地分析患者生病情况，根据冠脉造影图像中血管存在方向性的特点，提出了一种基于方向指数加权的无抽样方向滤波器组的图像合成方法。该方法首先通过使用无抽样方向滤波器组对血管图像进行方向分解，然后对方向图像分别进行基于Hessian矩阵的图像增强，最后将增强后的各方向图像结合生成增强图像。与传统的直接加和方向合成方法相比，改进的重构方法能够更充分地利用血管方向性的特点，增强主方向权重。实验结果表明，与传统的血管增强方法相比，该方法能够得到更为完整的血管树，取得了更好的增强效果。%To facilitate the examination of coronary angiogram images and to more accurately analyze patient illnes⁃ses with respect to the directivity characteristics of blood vessels in these images, this study proposes a novel image synthesis method for filters with no sampling direction based on directional exponent weighting. The proposed ap⁃proach incorporates the presentation of line⁃like directional features in an image extracted by filters with no sampling direction. To achieve coronary angiogram image enhancement, we first use no⁃sampling⁃direction filters to decom⁃pose the angiogram image into several directions, then we employ the Hessain matrix method for each directional image to enhance the image. Finally, all enhanced directional images are combined to generate the enhanced image. Compared with the traditional synthesis achieved by simply summing directional images, the proposed new synthesis method that is based on the weight of every direction makes better use of the directional feature of blood vessels and enhances the weight of the main direction. Experimental results show that a more complete blood vessel tree can be acquired and a better enhancement effect can be achieved by the proposed method when compared with convention⁃al blood vessel enhancement method.