Dear Chris and Antonin,

I found in some archived message or in the wiki that the default used to be 50 iterations at some time in previous releases of FreeSurfer for standard recon-all. Therefore, I changed it to 50 as default for every resolution in the recent release. This works fine for example for up to 0.5x0.5x0.5mm3 data.

I'd also say, more is better and I have not experienced any drawbacks. Processing time doesn't seem to increase noticeably, too.

Best,

Falk

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Von: freesurfer-bounces@nmr.mgh.harvard.edu [freesurfer-bounces@nmr.mgh.harvard.edu]" im Auftrag von "Antonin Skoch [ansk@ikem.cz]
Gesendet: Donnerstag, 9. Februar 2017 16:20
An: freesurfer@nmr.mgh.harvard.edu
Betreff: Re: [Freesurfer] Expert file for recon-all -hires

Dear Chris,

I have found that -n 15 is for our 0.7x0.7x0.7mm3 data not enough.

I determined optimal value -n 30, empirically, by looking at the shape of inflated surface with various number of iterations. Over -n 30 there was almost no further progression in inflation.

I suppose that better more than less. But maybe experts can correct me or provide better suggestion.

Antonin

Hi all,

If I'm reading this <
https://surfer.nmr.mgh.harvard.edu/fswiki/SubmillimeterRecon> correctly,
the current best practice for `-hires` is to include an expert file
containing "mris_inflate -n 15", and that this should work for all voxel
sizes (0.75mm)^3 - (1mm)^3? Or do we need to empirically determine the best
value for a given voxel size, and if so, what should be the criteria for
making this determination?

Thanks,
Chris Markiewicz

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