code: def crop_to_seg_extents(img, seg, padding):
      
  
      beg_coords, end_coords = crop_coords(seg, padding)
  
      img = crop_3dimage(img, beg_coords, end_coords)
      seg = crop_3dimage(seg, beg_coords, end_coords)
  
      return img, seg
docs: Crop the image (usually MRI) to fit within the bounding box of a segmentation (or set of seg)