= FEM median nerve tutorial =
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== Dataset description ==
==== Experiment ====
The experiment consists of an unilateral median nerve stimulation conducted in a MEG laboratory with an Elekta Triux (Megin, Finland) scanner.

 * The stimulation signal was a square-wave pulse with 2Hz frequency and duration of 0.2ms.
 * An ISI (inter-stimulus interval) of 500ms with a variation of ±20ms in order to be able to average out time-locked noise to the stimulation, while remaining unnoticeable by the subject.
 * The stimulation was performed on the left hand/wrist, for two minutes, with a Digitimer DS7A stimulator. An electrode was placed on the hand/wrist while current value was tuned to match the motor threshold of the subject on the stimulated hand, with a result of 10~12mA approximately.
 * Recordings were performed with a 1kHz sampling rate. Continuous HPI was disabled during these recordings. High-pass filters were set to DC for MEG channels and 0.03Hz for EEG channels.
 * All MEG files underwent a MaxFilter (version 2.3.13) tsss post-processing.

MRI imaging scanning (Philips Medical Systems):

 * T1w image without contrast: 3T field strength, flip angle  8°, TR 7.9s,  dimensions 512 × 512 × 200, and voxel dimensions of 0.469 ×  0.469 × 0.939 millimeters
 * T2w  spin-echo image: 3T field  strength, 78.57% phase FOV, 90° flip angle, SAR 0.327, voxel dimensions  560 × 560 × 55, dimensions of 0.429 × 0.429 × 3 millimeters
 * DWI  sequences: voxel dimensions 512 x 512 x 200 and dimensions of 0.469 ×  0.469 × 0.939 millimeters, diffusion-sensitizing gradients in 32  non-collinear directions

==== Files ====
The dataset we distribute with this tutorial follows the [[http://bids.neuroimaging.io|Brain Imaging Data Structure (BIDS)]] standard for neuroimaging data organization. The files that will be imported in this tutorial are the  following:

'''sample_fem'''/'''sub-fem01'''/: Raw data for subject fem01

 * '''ses-meg'''/: Simultaneous recordings of MEG and EEG.
  * '''sub-fem01_ses-meg_task-mediannerve_run-01_proc-tsss_meg.fif'''
 * '''ses-mri'''/: Imaging exams.
  * '''anat'''/'''sub-fem01_ses-mri_T1w.nii.gz''': T1-weighted MRI
  * '''anat'''/'''sub-fem01_ses-mri_T2w.nii.gz''': T2-weighted MRI
  * '''dwi'''/'''sub-fem01_ses-mri_dwi.*''': Diffusion-Weighted Imaging (DWI)

==== License ====
Creative Commons CC0 1.0 Universal. This dataset is distributed in the public domain.

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== Tutorials using this dataset ==
 * [[Tutorials/FemMedianNerveCharm|FEM median nerve]]