[Neuroimaging] change nifti header in nibabel

[Ze Wang]

Hi,   Does anyone know how to change the dimension of the nifti image 
and save back to disk?   My nifti files should be a 4D image but my c++ 
code wrongly set the dimensionality to be 3 rather than 4.  The data 
were saved correctly and can be read using mricron. Certainly, FSL and 
SPM and nibabel can all only read the first volume.
I tried the following way to read the data using nibabel:
v=nib.load('file.nii.gz')
v.header['dim'][0]=4
dat=v.get_fdata()
But it still failed to read the 4D data.  My question is: 1. how to let 
nibabel know that the updated header information should be used when 
read data?  2. how to save the new header back to the file without 
loading the data?

Thanks
Ze
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