About exporting as 4D matrix

1

Dear Bst team:
Now I have a difficult question about exporting as 4D matrix.I try to export my source files as 4D matrix.When I read the 4D matrix in the Python environment, I found that the dimension of CUBE is 73x92x69x3. I know that 3 represents the time point, but what does 73x92x69 specifically mean?
Hope your reply,thanks!

11
11515×540 43.2 KB
22
22390×506 36.3 KB

2

The first 3 dimensions are the volume itself (x,y,z) and the last one the time.
You have exported 3 volumes, that are concatenated along the 4th dimension

3

Dear Francois:
First of all, thank you for your reply. Is the (73,92,69) here the coordinates of the entire 15002 dipoles? So when I select a scout, how can I extract the (x, y, z) coordinates of the dipoles in the ROI。

4

Is the (73,92,69) here the coordinates of the entire 15002 dipoles?

No, the process you selected (export to SPM8) re-interpolates on the MRI volume the sources you estimated on the surface. If you don't want the results to be re-interpolated and want the values directly on the 15000V surface, just read the .mat source file in python.

So when I select a scout, how can I extract the (x, y, z) coordinates of the dipoles in the ROI。

The data structures of Brainstorm are documented in the introduction tutorials:
https://neuroimage.usc.edu/brainstorm/Tutorials/SourceEstimation#On_the_hard_drive
https://neuroimage.usc.edu/brainstorm/Tutorials/Scouts#On_the_hard_drive

Please search the forum if you need additional help, this has been widely discussed already.