利用VTK获得图像的方向余弦值，从而得到图像的旋转变换矩阵。-Use VTK get direction cosine of the image, resulting in rotational transformation matrix image.

利用VTK对二维超声纹理图像做旋转变换，从而实现二维坐标到三维空间的映射。-VTK use of two-dimensional ultrasound image texture do rotational transformation in order to achieve the two-dimensional coordinates to map the three-dimensional space.