brainweb "index" values do not match #18
Description
the imported label image has different values than expected, leading to aroundFat, dura and marrow being empty
>>> import sirf.STIR
>>> im=sirf.STIR.ImageData('brainweb_labels.nii')
>>> arr=im.as_array()
>>> numpy.unique(arr)
array([ 0., 16., 32., 48., 64., 80., 96., 112., 128., 145., 161., 177.], dtype=float32)
>>> import brainweb
>>> brainweb.Act.aroundFat
144
>>> brainweb.Act.dura
160
>>> brainweb.Act.marrow
176
It seems safer to use the 8bit valued images, in which case we wouldn't have this problem