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plugins/NFT/Chapter_01_Getting_Started_with_NFT.md plugins/NFT/Chapter-01-Getting-Started-with-NFT.md

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title: Chapter-01-Getting-Started-with-NFT
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long_title: Chapter-01-Getting-Started-with-NFT
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---
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Introduction
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------------

plugins/NFT/Chapter_02_Head_Modeling_from_MR_Images.md plugins/NFT/Chapter-02-Head-Modeling-from-MR-Images.md

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title: Chapter-02-Head-Modeling-from-MR-Images
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long_title: Chapter-02-Head-Modeling-from-MR-Images
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---
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The steps of head modeling are segmentation, mesh generation, and
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co-registration of electrode locations with scalp surface. User may also
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generate a source space to be used in the solution of the inverse
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problem. Figure 2 shows the steps of head modeling using MR images.
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![Figure 2: steps of head modeling using MR images](NFM_Toolboox_UsersManual_html_2aaa1b22.gif)
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Each step in realistic head modeling is implemented as a separate GUI
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module reachable from the main menu. These modules are described in the
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following sub-sections.
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panels. The available choices are the MR volume, the filtered volume or
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various stages of segmentation.
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![](NFT_from_MRI_segmentation.png) .....
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![Figure 3: Interface for segmentation](NFT_segmentation.png)
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The panel on the right of the segmentation GUI shows the segmentation
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steps that will be performed on the volume in order:
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images. The result of Brain segmentation can be seen by selecting “Brain
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Mask”.
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![Figure 4: Interface of segmentation during setting lowest point
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for cerebellum.](NFT_cerebellarlowpoint.png "wikilink") ......
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![Figure 5: Interface of segmentation during a seed point
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selection on WM.](NFT_WMpointselection.png "wikilink")
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### Outer skull segmentation
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For outer skull segmentation, seed points for the eye lobes are selected
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to click on eye lobes. Once the eyes are selected the outer skull is
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segmented and can be seen by “Outer skull mask”.
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![Figure 6: Interface of segmentation to select an axial slice where the eyes are clearly observed.](NFT_eyeselection.png "wikilink")
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![Figure 7: Matlab figure to click on eye lobes.](NFT_eyelobes.png "wikilink")
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### Inner skull segmentation
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Inner skull segmentation does not require any user input. After the
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of the mesh file is given in [Appendix A](/NFT_Appendix_A "wikilink").
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The mesh generation process is described below.
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![](NFT_from_MRI_mesh_gen.png "wikilink") .....
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![Figure 8: Interface for mesh
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generation.](NFT_meshgeneration_ui.png "wikilink")
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Mesh Generation module creates triangular meshes that fits the
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boundaries of the segmentation. The aim is to approximate the geometry
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parametric inverse problem solution to find a coarse estimate of the
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dipole position.
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![](NFT_from_MRI_source_space.png "wikilink") .....
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![Figure 9: Interface for source space generation.](NFT_sourcespacegen.png "wikilink")
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Co-registration of electrode locations
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--------------------------------------
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specific to a session. The result of electrode co-registration is saved
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as Session_Name_Subject_Name_headsensors.sens in ASCII format.
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![](NFT_from_MRI_coreg.png "wikilink") ....
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![Figure 10: Interface for co-registration.](NFT_coregistration.png "wikilink")
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Head Modeling using Template Warping
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------------------------------------
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In Figure 11 the interface for warping module is shown.
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![](NFT_from_Warping.png "wikilink") .....
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![Figure 11: Interface warping of a template head model.](NFT_warping_ui.png "wikilink")
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------------------------------------------------------------------------
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References

plugins/NFT/Chapter_03_Forward_Model_Generation.md plugins/NFT/Chapter-03-Forward-Model-Generation.md

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title: Chapter-03-Forward-Model-Generation
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long_title: Chapter-03-Forward-Model-Generation
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---
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Forward Problem: Boundary Element Method
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----------------------------------------

plugins/NFT/Chapter_04_NFT_Examples.md plugins/NFT/Chapter-04-NFT-Examples.md

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title: Chapter-04-NFT-Examples
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long_title: Chapter-04-NFT-Examples
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---
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In this section, two head modeling examples are presented. Both of these
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examples use the same subject. The first example generates a realistic
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scalp, skull, csf, and brain layers for a total of 16016 nodes and 32024
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elements. The individual layers can be seen in Figure 13.
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![a](NFM_Toolboox_UsersManual_html_56c540a1.gif "wikilink") ...
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![d](NFM_Toolboox_UsersManual_html_m69f7a676.gif "wikilink")
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Figure 13: BEM model of the scalp, skull, csf and the brain obtained
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from an MR image. (a) scalp mesh, (b) skull mesh, (c) CSF mesh, (d)
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brain mesh.
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After mesh generation, the electrodes and the realistic mesh is
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co-registered. The result of co-registration can be seed in Figure 14.
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![Figure 14: Registered electrode locations on the scalp mesh.](NFM_Toolboox_UsersManual_html_7b73089f.gif "wikilink")
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The second example assumes that the only available subject data is the
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141 digitized electrode locations. For warping the template MNI mesh is
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used, which has three layers and 3000 nodes and 5988 elements. This is
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the standard mesh that is also used by other BEM solvers in the
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literature. The results of warping can be seen in Figure 15.
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![d](NFM_Toolboox_UsersManual_html_m788a9795.gif "wikilink")
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Figure 15: BEM model of the scalp, skull, the brain obtained by warping
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a template head model to electrode locations. (a) scalp mesh, (b) skull
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mesh, (c) brain mesh, (d) electrode locations.

plugins/NFT/Chapter_05_NFT_Commands_and_Functions.md plugins/NFT/Chapter-05-NFT-Commands-and-Functions.md

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title: Chapter-05-NFT-Commands-and-Functions
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long_title: Chapter-05-NFT-Commands-and-Functions
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---
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This section summarizes the MATLAB commands and data structures used for
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each stage of head modeling using the NFT toolbox. The function
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plugins/NFT/NFT_Appendix_A.md plugins/NFT/NFT-Appendix-A.md

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title: NFT-Appendix-A
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long_title: NFT-Appendix-A
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---
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BEM Mesh Format
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---------------

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