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Hi Douglas,
So to register PET to gtmseg space mri_gtmpvc command use nearest neighbor, interpolation right ?
And what about the interpolation method to use when projecting PVE corrected PET on surface ?
Thanks,
Matthieu
On 14/02/2019 17:44, Greve, Douglas N.,Ph.D. wrote:
The GTM operates on regions, so you can't do trilin interp. The operations that you describe below are not used in mri_gtmpvc. If you are trying to get something close to what the GTM does, then use nearest neighbor
On 2/14/19 3:43 AM, Matthieu Vanhoutte wrote:
External Email - Use CautionHi Douglas,
Could you help me concerning my previous questions ?
Thanks, Matthieu
Le 11 févr. 2019 à 17:37, Matthieu VANHOUTTE matthieuvanhoutte@gmail.com a écrit :
Hi Douglas,
Thanks for clarification. Why use "nearest neighbor" instead of classical "trilinear" interpolation ?
Should it be done as well when projecting from volume to surface with mri_vol2surf ?
Best,
Matthieu
On 11/02/2019 17:32, Greve, Douglas N.,Ph.D. wrote:
It will not used trilinear interp. Try it with nearest neighbor
On 2/10/19 11:55 AM, Matthieu Vanhoutte wrote:
External Email - Use CautionDear Douglas,
Before using "mri_gtmpvc --psf 0 --no-tfe -- rbv" according your advice to obtain voxel-wise output rescaled without PVC correction, I have done sequentially the different steps to obtain this output. However, when comparing voxel-wise rescaled output (rbv.nii.gz) between the two methods, final values at each voxel are not the same…
To obtain first rescaled voxel-wise output I have used sequentially these steps:
- Concatenate transforms from PET space to gtmseg.mgz
- Register native PET into gtmseg space (trilin. interpolation)
- Compute mean PET inside reference regions (with regions masks from gtmseg.mgz)
- Compute intensity normalized PET images in gtmseg space
Doesn’t the "mri_gtmpvc --psf 0 --no-tfe -- rdv" command use these same steps ?
Best, Matthieu
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