[Neuroimaging] Cannot edit some NIfTI header fields
h.chr at mail.ru
Tue Aug 25 20:26:23 CEST 2015
Hi, I am experiencing some issues with editing my NIfTI headers.
Apparently I can save some tags after I edit them, but not others.
I have pasted all my outputs here: https://neurostars.org/p/3362/
Can you help me out?
I have received the following suggestion:
>Just guessing, but I wonder if you are trying to edit the fields
>supporting the affines, and then saving the image?
>If you are doing this, then the image save takes the image affine and
>applies it to the header, overwriting any changes you made the qform
>fields, including pixdim.
>If you want to change the qform / sform affine in the image header,
>use the ``img.set_qform`` and `img.set_sform`` methods.
I have looked into these functions, and I cannot figure out how I could
use them to effect the changes I waqnt in the header. The most
important thing right now would be to be able to edit pixdim. For
some reason this is set to the slice spacing (which is 0.5mm) but I
want it set to (and I believe it *should* be set to) the slice
thickness, which is 0.3mm.
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