The conversions between tkrRas and scannerRAS are as following in Freesurfer:
tkrRAS = tkrvox2ras * inv(vox2ras) * scannerRAS
scannerRAS = vox2ras * inv(tkrvox2ras) * tkrRAS
Best,
Yujing
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> On Behalf Of Eric Tsang
Sent: Thursday, December 14, 2023 5:51 PM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] Convert Scanner RAS to Vertex RAS
External Email - Use Caution
Dear All,
I have great deal of trouble converting scanner RAS to vertex RAS. I have
tried a couple of formula (in the following) which had failed to produce
accurate coordinate.
[tkR tkA tkrS] = [ScannerRAS 1] / (vox2ras * inv(tkrvox2ras))
[tkR tkA tkrS] = [ScannerRAS 1] * inv(vox2ras0)
Both of these formula produced distorted coordinates. Please help!
Thanks,
Tim
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