title: How can I reduce the number of channels in an MRI (.nii format) image?
body: <p>I have been trying to feed a dataset of brain MRI images (IXI dataset) to a ConvNet, however, some of the images have 140 channels some others 150 channels. How can I make all the images have the same number of channels so that I won't run into trouble with a fixed CNN input shape? I am using nibabel lib for reading the .nii files.</p>
  <p>EDIT:
  I don't have much knowledge about MRI images, what channels should be discarded?</p>