Dear all,
I'm confused about FSL's conventions for dealing with Analyze files.
It says on the FSL site at <http://www.fmrib.ox.ac.uk/fsl/fsl/
formats.html> that Analyze files are treated as being in radiological
convention, i.e. LAS. However, if I convert an Analyze file to Nifti
using fslchfiletype I get a header indicating that the file is *RAS*,
as shown below. Moreover, the image data is unchanged, rather than
being flipped left-to-right as seems to be the case with the header.
Can anyone shed any light on why this is?
Cheers,
Jon
$ ls basic*
basic.hdr.gz basic.img.gz
$ fslhd basic | grep -a file_type
file_type ANALYZE-7.5
$ cp basic.hdr.gz basic2.hdr.gz
$ cp basic.img.gz basic2.img.gz
$ ls basic*
basic.hdr.gz basic.img.gz basic2.hdr.gz basic2.img.gz
$ fslchfiletype NIFTI_PAIR_GZ basic2
$ fslhd basic2 | grep xorient
qform_xorient Left-to-Right
sform_xorient Unknown
$ diff basic.img.gz basic2.img.gz
$
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