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templateflow / tpl-MNI152NLin6Asym

FSL's modified version (Asymmetric) of the MNI ICBM 152 non-linear 6th Generation Symmetric Average Brain Stereotaxic Registration Model
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3mm Resolution Template has 0.5mm Resolution #5

Closed ellisdg closed 3 years ago

ellisdg commented 3 years ago

I'm not sure if this is the right place to post this, but when I download the 3mm MNI152NLin6Asym template the spacing is actually 0.5 mm instead of 3mm.

I even tried downloading it directly from AWS: https://templateflow.s3.amazonaws.com/tpl-MNI152NLin6Asym/tpl-MNI152NLin6Asym_res-03_T1w.nii.gz

Output from fslinfo:

data_type INT16 dim1 364 dim2 436 dim3 364 dim4 1 datatype 4 pixdim1 0.500000 pixdim2 0.500000 pixdim3 0.500000 pixdim4 1.000000 cal_max 250.000000 cal_min 0.000000 file_type NIFTI-1+

I assume this is some sort of mistake, but let me know I'm wrong and I just don't understand how the templateflow resolutions work.

effigies commented 3 years ago

3 is an index, not a mm measurement. The metadata is where you should look for actual resolutions.

ellisdg commented 3 years ago

Thanks for the quick reply. What does a resolution index of 3 mean? Is there a dictionary somewhere for the definitions of the template descriptors?

ellisdg commented 3 years ago

Nevermind. I realize now that to see the resolutions you have to use the "templateflow.api.get_metadata" function for a specific template and then select the index for the desired resolution. Thanks for the help!