8.2.12. Plotting tools in nilearn

Nilearn comes with a set of plotting functions for easy visualization of Nifti-like images such as statistical maps mapped onto anatomical images or onto glass brain representation, anatomical images, functional/EPI images, region specific mask images.

See Plotting brain images for more details.

First, we retrieve from nilearn provided (general-purpose) datasets

from nilearn import datasets

# haxby dataset to have EPI images and masks
haxby_dataset = datasets.fetch_haxby()

# print basic information on the dataset
print('First subject anatomical nifti image (3D) is at: %s' %
print('First subject functional nifti image (4D) is at: %s' %
      haxby_dataset.func[0])  # 4D data

haxby_anat_filename = haxby_dataset.anat[0]
haxby_mask_filename = haxby_dataset.mask_vt[0]
haxby_func_filename = haxby_dataset.func[0]

# localizer dataset to have contrast maps
localizer_dataset = datasets.fetch_localizer_button_task(get_anats=True)
localizer_anat_filename = localizer_dataset.anats[0]
localizer_tmap_filename = localizer_dataset.tmaps[0]


First subject anatomical nifti image (3D) is at: /home/kamalakar/nilearn_data/haxby2001/subj2/anat.nii.gz
First subject functional nifti image (4D) is at: /home/kamalakar/nilearn_data/haxby2001/subj2/bold.nii.gz Plotting statistical maps with function plot_stat_map

from nilearn import plotting

# Visualizing t-map image on subject specific anatomical image with manual
# positioning of coordinates using cut_coords given as a list
plotting.plot_stat_map(localizer_tmap_filename, bg_img=localizer_anat_filename,
                       threshold=3, title="plot_stat_map",
                       cut_coords=[36, -27, 66])
../../_images/sphx_glr_plot_demo_plotting_001.png Plotting statistical maps in a glass brain with function plot_glass_brain

Now, the t-map image is mapped on glass brain representation where glass brain is always a fixed background template

plotting.plot_glass_brain(localizer_tmap_filename, title='plot_glass_brain',
../../_images/sphx_glr_plot_demo_plotting_002.png Plotting anatomical images with function plot_anat

Visualizing anatomical image of haxby dataset

plotting.plot_anat(haxby_anat_filename, title="plot_anat")
../../_images/sphx_glr_plot_demo_plotting_003.png Plotting ROIs (here the mask) with function plot_roi

Visualizing ventral temporal region image from haxby dataset overlayed on subject specific anatomical image with coordinates positioned automatically on region of interest (roi)

plotting.plot_roi(haxby_mask_filename, bg_img=haxby_anat_filename,
../../_images/sphx_glr_plot_demo_plotting_004.png Plotting EPI image with function plot_epi

# Import image processing tool
from nilearn import image

# Compute the voxel_wise mean of functional images across time.
# Basically reducing the functional image from 4D to 3D
mean_haxby_img = image.mean_img(haxby_func_filename)

# Visualizing mean image (3D)
plotting.plot_epi(mean_haxby_img, title="plot_epi")

A call to plotting.show is needed to display the plots when running in script mode (ie outside IPython)

Total running time of the script: ( 0 minutes 7.507 seconds)

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