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Thanks for your response. We followed your suggestion and ran the 7T data without the -highres option. This gave us values which are in the normal range of what we get when using 3T mean curvature data. We looked whether there was a fixed scaling factor between the data with and without the -highres option. This did not seem to be the case as the scaling factor for the different subregions varied between 1,18 (for the left G_subcallosal) and 2,95 (for the left S_collat_transv_ant). I attached a pdf with the results.
This does not make sense to me. What resolution is your 3T and 7T data? Can you run the 7T data at 1mm (ie, without the -hires option) and see if it changes?_______________________________________________
On 3/20/2022 9:42 AM, Samuel Paré wrote:
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Hello,
We are looking at some of our data acquired on a 7T magnet. We ran recon-all with the “highres” flag. The obtained results for cortical thickness and cortical volume are very comparable to data that we obtain when using 3 T brain images. However, the results for cortical curvature are significantly different from what we get by our 3 T data. I attach the output of mean cortical curvature values using the Destrieux atlas for a 3T and 7T dataset on healthy controls. As you can notice, they differ roughly by a factor of 2. Any explanation for what may cause this large difference?
Thanks,
Samuel
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Samuel Paré, MScLaboratoire du développement et plasticité du système visuelUniversité de MontréalÉcole d'optométrie
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