四元数矩理论的彩色医学图像配准

Color Medical Image Registration Based on Quaternion Moment Theory

现有的彩色医学图像配准方法一般是采用体外定位标记法,如SPECT/CT彩色医学图像,但外标记支架与病体的固定检查比较繁琐,本文提出一种四元数彩色模型下,求取旋转角度与平移量等配准参数的方法。首先将彩色医学影像用四元数向量矩阵形式表达,在此基础上,提出SPECT/CT医学图像四元数几何矩的计算方法,根据四元数图像质量分布情况,利用图像转动惯量的性质,求取两图像的相对旋转角度;再利用两图像的质心欧氏距离确定两图像的平移量,继而实现配准。该方法对彩色图像SPECT/CT进行配准实验,获得了良好配准结果,实验证明该方法的有效性与可行性。

The current method of SPECT/CT color medical image registration uses the location marker in vitro generally, such as SPECT/CT color medical image, but using the external-marker stent fixation with patient for examination is complicated relatively. A method of calculating registration parameters such as rotation angle and translation amount is proposed based on Quaternion color model. Firstly, the color medical image is represented as Quaternion vector matrix form. On the basis of this, a calculation method of Quaternion geometric moment is put forward about SPECT/CT color medical image. According to the distribution of Quaternion image quality, the relative rotation angle of two-mode image is obtained by using rotational inertia properties of Quaternion image. Then, the translation amount between two images is determined to realize registration by using Euclidean distance measure of mass center. The SPECT/CT color medical images are used in registration experiment. Good registration results are obtained, and this method is proved to be of effectiveness and feasibility.