= 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.

<<TableOfContents(3,2)>>

== 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 [[http://neuroimage.usc.edu/brainstorm3_register/download.php|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. <<BR>><<BR>> {{attachment:phantom_anat.gif||height="178",width="208"}}
 * You can display the MRI and surfaces as presented in the introduction tutorials. <<BR>><<BR>> {{attachment:phantom_mri.gif||height="314",width="281"}} {{attachment:phantom_surfaces.gif||height="314",width="341"}}

== Access the recordings ==
 * Switch to the "functional data" view.
 * Right-click on the subject folder > '''Review raw file'''. <<BR>>Select the file format: "'''MEG/EEG: CTF (*.ds)'''" <<BR>>Select all the folders in: '''sample_phantom'''. <<BR>><<BR>> {{attachment:phantom_review.gif||height="197",width="512"}}
 * Each folder corresponds to one dataset:
  * '''emptyroom_20150709_01.ds''': Phantom inside the MEG helmet, but not plugged in
  * '''phantom_20uA_20150603_03.ds''': Phantom active, 23Hz, 20uA, [0,-1.8,4.9]cm
  * '''phantom_200uA_20150709_01.ds''': Phantom active, 7Hz, 200uA, [0,-1.8,4.9]cm
 * 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 = 20uA, Right = 200uA<<BR>><<BR>> {{attachment:phantom_registration.gif||height="189",width="417"}}
 * For each of the three runs: right-click on "Link to raw file" > '''Switch epoched/continuous''' <<BR>><<BR>> {{attachment:phantom_continuous.gif||height="167",width="279"}}

== 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 '''