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reference:ft_prepare_vol_sens [2018/08/23 14:43] (current)
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 +=====  FT_PREPARE_VOL_SENS =====
 +
 +Note that this reference documentation is identical to the help that is displayed in MATLAB when you type "help ft_prepare_vol_sens"​.
 +
 +<​html><​pre>​
 +  <a href=/​reference/​ft_prepare_vol_sens><​font color=green>​FT_PREPARE_VOL_SENS</​font></​a>​ does some bookkeeping to ensure that the volume
 +  conductor model and the sensor array are ready for subsequent forward
 +  leadfield computations. It takes care of some pre-computations that can
 +  be done efficiently prior to the leadfield calculations.
 + 
 +  Use as
 +    [headmodel, sens] = ft_prepare_vol_sens(headmodel,​ sens, ...)
 +  with input arguments
 +    headmodel ​ structure with volume conductor definition
 +    sens       ​structure with gradiometer or electrode definition
 + 
 +  The headmodel structure represents a volume conductor model of the head,
 +  its contents depend on the type of model. The sens structure represents a
 +  sensor array, i.e. EEG electrodes or MEG gradiometers.
 + 
 +  Additional options should be specified in key-value pairs and can be
 +    '​channel' ​   cell-array with strings (default = '​all'​)
 +    '​order' ​     number, for single shell "​Nolte"​ model (default = 10)
 + 
 +  The detailed behaviour of this function depends on whether the input
 +  consists of EEG or MEG and furthermoree depends on the type of volume
 +  conductor model:
 +  - in case of EEG single and concentric sphere models, the electrodes are
 +    projected onto the skin surface.
 +  - in case of EEG boundary element models, the electrodes are projected on
 +    the surface and a blilinear interpoaltion matrix from vertices to
 +    electrodes is computed.
 +  - in case of MEG and a localspheres model, a local sphere is determined
 +    for each coil in the gradiometer definition.
 +   - in case of MEG with a singleshell Nolte model, the volume conduction
 +     model is initialized
 +  In any case channel selection and reordering will be done. The channel
 +  order returned by this function corresponds to the order in the '​channel'​
 +  option, or if not specified, to the order in the input sensor array.
 + 
 +  See also <a href=/​reference/​ft_compute_leadfield><​font color=green>​FT_COMPUTE_LEADFIELD</​font></​a>,​ <a href=/​reference/​ft_read_vol><​font color=green>​FT_READ_VOL</​font></​a>,​ <a href=/​reference/​ft_read_sens><​font color=green>​FT_READ_SENS</​font></​a>,​ <a href=/​reference/​ft_transform_vol><​font color=green>​FT_TRANSFORM_VOL</​font></​a>,​
 +  <a href=/​reference/​ft_transform_sens><​font color=green>​FT_TRANSFORM_SENS</​font></​a>​
 +</​pre></​html>​