code: def iMath_truncate_intensity(image, lower_q, upper_q, n_bins=64):
      
      return iMath(image, 'TruncateIntensity', lower_q, upper_q, n_bins )
docs: >>> import ants
      >>> img = ants.image_read(ants.get_ants_data('r16'))
      >>> ants.iMath_truncate_intensity( img, 0.2, 0.8 )