Map from Volume to Vertex Data¶
In order to move from Volume data to Vertex data, you start with data from voxels and then create a cortex.Volume object. Then, you get a mapper to go between voxels and vertices for the specific subject and transform you are working with. Pass the voxel volume through the mapper and you get out a vertex mapping of that data. You can plot both of these as you normally would.
import cortex import cortex.polyutils import numpy as np np.random.seed(1234) import matplotlib.pyplot as plt subject = 'S1' xfm = 'fullhead' # First create example voxel data for this subject and transform voxel_data = np.random.randn(31, 100, 100) voxel_vol = cortex.Volume(voxel_data, subject, xfm) # Then we have to get a mapper from voxels to vertices for this transform mapper = cortex.get_mapper(subject, xfm, 'line_nearest', recache=True) # Just pass the voxel data through the mapper to get vertex data vertex_map = mapper(voxel_vol) # You can plot both as you would normally plot Volume and Vertex data cortex.quickshow(voxel_vol) plt.show() cortex.quickshow(vertex_map) plt.show()
Total running time of the script: ( 0 minutes 7.842 seconds)