8.3. Computer Parcel Aggregation.

This example uses a ParcelAggregation marker to compute the mean of each parcel using the Schaefer parcellations (100 rois, 7 Yeo networks) for both a 3D and 4D nifti

Authors: Federico Raimondo

License: BSD 3 clause

import nilearn

from junifer.markers.parcel_aggregation import ParcelAggregation
from junifer.utils import configure_logging

Set the logging level to info to see extra information

configure_logging(level="INFO")

2023-03-31 13:28:25,310 - JUNIFER - INFO - ===== Lib Versions =====
2023-03-31 13:28:25,311 - JUNIFER - INFO - numpy: 1.23.5
2023-03-31 13:28:25,311 - JUNIFER - INFO - scipy: 1.10.1
2023-03-31 13:28:25,311 - JUNIFER - INFO - pandas: 1.5.3
2023-03-31 13:28:25,311 - JUNIFER - INFO - nilearn: 0.10.0
2023-03-31 13:28:25,311 - JUNIFER - INFO - nibabel: 4.0.2
2023-03-31 13:28:25,311 - JUNIFER - INFO - junifer: 0.0.2
2023-03-31 13:28:25,311 - JUNIFER - INFO - ========================

Load the VBM GM data (3d): - Fetch the Oasis dataset

oasis_dataset = nilearn.datasets.fetch_oasis_vbm(n_subjects=1)
vbm_fname = oasis_dataset.gray_matter_maps[0]
vbm_img = nilearn.image.load_img(vbm_fname)

Dataset created in /home/runner/nilearn_data/oasis1

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/opt/hostedtoolcache/Python/3.10.10/x64/lib/python3.10/site-packages/nilearn/datasets/struct.py:733: UserWarning: `legacy_format` will default to `False` in release 0.11. Dataset fetchers will then return pandas dataframes by default instead of recarrays.
  warnings.warn(_LEGACY_FORMAT_MSG)

Load the functional data (4d): - Fetch the SPM auditory dataset - Concatenate the functional data into one 4D image

s_func_data = nilearn.datasets.fetch_spm_auditory()
fmri_img = nilearn.image.concat_imgs(s_func_data.func)

Dataset created in /home/runner/nilearn_data/spm_auditory

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Define the marker

marker = ParcelAggregation(parcellation="Schaefer100x7", method="mean")

Prepare the input

input = {
    "BOLD": {"data": fmri_img, "meta": {"element": "subject1"}},
    "VBM_GM": {"data": vbm_img, "meta": {"element": "subject1"}},
}

Fit transform the data

out = marker.fit_transform(input)

2023-03-31 13:28:59,072 - JUNIFER - INFO - Computing BOLD
2023-03-31 13:28:59,072 - JUNIFER - INFO - Fetching one of Schaefer parcellations.
2023-03-31 13:28:59,073 - JUNIFER - INFO - Parcellation parameters:
2023-03-31 13:28:59,073 - JUNIFER - INFO -      n_rois: 100
2023-03-31 13:28:59,073 - JUNIFER - INFO -      yeo_networks: 7
2023-03-31 13:28:59,073 - JUNIFER - INFO -      resolution: 3.0
2023-03-31 13:28:59,073 - JUNIFER - INFO - At least one of the parcellation files are missing. Fetching using nilearn.

Dataset created in /home/runner/junifer/data/parcellations/schaefer_2018

Downloading data from https://raw.githubusercontent.com/ThomasYeoLab/CBIG/v0.14.3-Update_Yeo2011_Schaefer2018_labelname/stable_projects/brain_parcellation/Schaefer2018_LocalGlobal/Parcellations/MNI/Schaefer2018_100Parcels_7Networks_order.txt ...
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2023-03-31 13:28:59,555 - JUNIFER - INFO - Loading parcellation /home/runner/junifer/data/parcellations/schaefer_2018/Schaefer2018_100Parcels_7Networks_order_FSLMNI152_2mm.nii.gz
2023-03-31 13:29:00,978 - JUNIFER - INFO - No storage specified, returning dictionary
2023-03-31 13:29:00,978 - JUNIFER - INFO - Computing VBM_GM
2023-03-31 13:29:00,978 - JUNIFER - INFO - Fetching one of Schaefer parcellations.
2023-03-31 13:29:00,978 - JUNIFER - INFO - Parcellation parameters:
2023-03-31 13:29:00,978 - JUNIFER - INFO -      n_rois: 100
2023-03-31 13:29:00,978 - JUNIFER - INFO -      yeo_networks: 7
2023-03-31 13:29:00,978 - JUNIFER - INFO -      resolution: 2.0
2023-03-31 13:29:00,981 - JUNIFER - INFO - Loading parcellation /home/runner/junifer/data/parcellations/schaefer_2018/Schaefer2018_100Parcels_7Networks_order_FSLMNI152_2mm.nii.gz
2023-03-31 13:29:01,554 - JUNIFER - INFO - No storage specified, returning dictionary

Check the results

print(out.keys())
print(out["VBM_GM"]["data"].shape)  # Shape is (1 x parcels)

print(out.keys())
print(out["BOLD"]["data"].shape)  # Shape is (timepoints x parcels)

dict_keys(['BOLD', 'VBM_GM'])
(1, 100)
dict_keys(['BOLD', 'VBM_GM'])
(96, 100)