CTF electric phantom with single dipole
Authors: Francois Tadel, Elizabeth Bock
This tutorial explains how to use recordings from the CTF electric phantom to test dipole fitting functions.
Contents
Phantom description
[TODO] Pictures
[TODO] Nature of the dipole that is generated
[TODO] References
Download and installation
Requirements: You have already followed all the introduction tutorials and you have a working copy of Brainstorm installed on your computer.
Go to the Download page of this website, and download the file: sample_phantom.zip
- Unzip it in a folder that is not in any of the Brainstorm folders (program folder or database folder)
- Start Brainstorm (Matlab scripts or stand-alone version)
Select the menu File > Create new protocol. Name it "TutorialPhantom" and select the options:
"No, use individual anatomy",
"No, use one channel file per acquisition run (MEG)".
Generate anatomy
In the Matlab command window: type "generate_ctf_phantom".
This creates a new subject Phantom and generates the "anatomy" for this device: one volume and a few surfaces representing the geometry of the phantom.
You can display the MRI and surfaces as presented in the introduction tutorials.
Access the recordings
- Switch to the "functional data" view.
Right-click on the subject folder > Review raw file.
Select the file format: "MEG/EEG: CTF (*.ds)"
Select all the folders in: Sub01/MEEG.
The recordings were acquired on different days, the position of the phantom in the MEG helmet is not the same for the two runs. Left = noise (2015-06-03), Right = clean (2015-07-09)
For each of the three runs: right-click on "Link to raw file" > Switch epoched/continuous
Import recordings
Noise covariance
Source modeling
Dipole fitting with FieldTrip
Scripting
Generate Matlab script
Available in the Brainstorm distribution: brainstorm3/toolbox/script/tutorial_phantom.m