对磁共振图像数据进行费米滤波，对滤波后图像进行边缘区域和图像区域的选取，并分别对两者进行均值和标准差的计算，最后得出信噪比。-For magnetic resonance images, we can use a Fermi filter to the image for filtering. After the selection of the area of the air and the area of the image,then calculate the mean value a