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tutorial:headmodel_eeg_bem [2016/06/23 10:15]
62.159.73.150 [Automatic alignment]
tutorial:headmodel_eeg_bem [2017/08/17 11:21] (current)
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 The **bnd** field contains the same information as the mesh we created in the earlier step. But the vol also contains a conductivity value for each surface and a matrix used for the volume conduction model. Note that the unit of measurement used in the geometrical description of vol is in '​mm'​. The EEG sensors should be also defined in '​mm'​. The units of all type of geometrical information should be the same when a leadfield is computed for source-reconstruction. The **bnd** field contains the same information as the mesh we created in the earlier step. But the vol also contains a conductivity value for each surface and a matrix used for the volume conduction model. Note that the unit of measurement used in the geometrical description of vol is in '​mm'​. The EEG sensors should be also defined in '​mm'​. The units of all type of geometrical information should be the same when a leadfield is computed for source-reconstruction.
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 +
 +<note warning>
 +The order in which different tissue types are represented in the output of ft_prepare_headmodel may depend on the volume conduction model you are using. Make sure to double-check which tissue type is represented where in vol.bnd.
 +</​note>​
 ===== Visualization ====== ===== Visualization ======
 The head model (vol) contains three structures in the **bnd** field. These are the geometrical descriptions of the scalp, skull and brain surfaces. First, we will plot each of the surfaces using the **[[reference:​ft_plot_mesh|ft_plot_mesh]]** function. Then, all surfaces will be plot together on the same figure. The head model (vol) contains three structures in the **bnd** field. These are the geometrical descriptions of the scalp, skull and brain surfaces. First, we will plot each of the surfaces using the **[[reference:​ft_plot_mesh|ft_plot_mesh]]** function. Then, all surfaces will be plot together on the same figure.