import os
import nibabel as nib

# 读取图像
path='C:\Users\Darren\Desktop\example.nii.gz'
img=nib.load(path)
# 查看图像的长宽高
img.shape
# 图像进行仿射变换
img.affine.shape
# 保存图像
path_save='C:\Users\Darren\Desktop\example_save.nii.gz'

img.to_filename(path_save)
或者
nib.save(img,path_save)

#读取并显示NII图像文件
from matplotlib import pyplot as plt
import SimpleITK as sitk

img_path = 'res.nii.gz'
I = sitk.ReadImage(img_path)
img = sitk.GetArrayFromImage(I)
plt.imshow(img[1,...], cmap='gray', interpolation='bicubic')
plt.xticks([]), plt.yticks([]) and Y axis
plt.show()