3 IDPs not available for structural MRI
Can anyone tell me why UKB is missing Freesurfer-derived area, thickness, and volume IDPs for frontal pole, temporal pole, and banks of superior temporal sulcus (instead only the FAST-derived IDPs are available for these regions)? Was there a decision based on quality to not generate/provide these variables?
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The FreeSurfer-derived IDPs and the FAST-derived IDPs use different atlases and modelling tools to obtain Regions of Interest (ROIs), which may lead to variations and differences in brain region classifications. The atlases that are used to generate the ROIs are referred to in the Primary Brain Imaging documentation (resource 1977) in section 3.6, where you may wish to explore more about what these methodologies involve.
If you would like to take a closer look at the ROIs usually specified within these different parcellation/segmentation methods, you might find the FreeSurfer Github to be a useful starting point, which contains this information in text files.
In relation to your specific question, it is worth noting that there is area, thickness and volume data for the FreeSurfer-derived IDPs for superior temporal sulcus (category 197, labelled under the name s-temporal-sup) as well as for the temporal pole (category 197, labelled as pole-temporal) and frontal pole (category 192, labelled as frontalpole). The fact that these ROIs aren't specified within every FreeSurfer IDP data-field is just related to the way in which these ROIs are obtained, as described above. I hope this helps!
Thank you for the information above! According to the description of the Desikan-Killiany (DK) atlas, the temporal pole is listed as one of the ROIs. However, I noticed that in https://biobank.ndph.ox.ac.uk/showcase/label.cgi?id=192, the Freesurfer parcellation of the white matter surface using the DK atlas does not appear to include the temporal pole. Is there a specific reason for this omission?
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