export

Export to GIFTI file format

Via the export menu it is possible to convert a BrainVoyager surface-related file to GIFTI. The exported file (*.gii) will be located in the same directory as the original BrainVoyager file.

Export of surface
Export of time course
Export of (statistical) map
Export of patch of interest

Export of surface: Via the first option one can export a BrainVoyager surface file (mesh)(*.srf) to GIFTI (*.surf.gii). When exporting a BrainVoyager surface file via the giftiplugin, the vertices and triangles are exported. The intent code is for the vertices set to "NIFTI_INTENT_POINTSET" and for the triangles to "NIFTI_INTENT_TRIANGLE".
The extension for the GIfTI surface file will become *.surf.gii.
Exported versions: 3 and 4 (when exporting from disk) or any version (when the file is opened in BrainVoyager).
For an example, see the figure below.

Export of time course: With the second option a BrainVoyager mesh time course (*.mtc) can be exported to GIFTI (*.time.gii). It might be necessary to choose the option to load the mesh time course in memory when linking the *.mtc to the surface in BrainVoyager.
A mesh time course has one vector per vertex (or node) in the mesh. The order of the data points in the mesh time course file corresponds to the order of the vertices in the surface file.
The intent for the mesh time series will be set to "NIFTI_INTENT_TIME_SERIES". The extension for a GIfTI mesh time course file will become *.time.gii.
Exported MTC file versions: version 1 (from disk) or currently open (any version).

Export of (statistical) map: A map on the surface (*.smp), which can be a statistical map or for example a cortical thickness map, can be exported to GIFTI file format (*.func.gii) via the third option.
Surface maps (*.smp) are scalar values on the mesh vertices. In BrainVoyager QX, these scalar values can represent statistics or curvature. An exported surface map will have the extension *.func.gii when the values are statistical or *.shape.gii when the values are curvature. Please see below for a mapping of the map type codes and from BrainVoyager to NIfTI. The value range of the maps is also included.

Description Code in BrainVoyager Value range Intent name

T-test 1 -10,000:10,000 NIFTI_INTENT_TTEST

Curvature 1 -10,000:10,000 NIFTI_INTENT_SHAPE

Correlation 2 -1:0:1 NIFTI_INTENT_CORRELATION

Cross-correlation 3 0:1 NIFTI_INTENT_CORRELATION

F-test 4 -10,000:10,000 NIFTI_INTENT_FTEST

Z-score 5 -3,43:3,43 NIFTI_INTENT_ZSCORE

chi-square 14 - NIFTI_INTENT_CHISQ

beta 15 - NIFTI_INTENT_BETA

Exported file versions: 3, 4 and 5 (when exporting from disk) or any version (when exporting currently open file).

Export of patch of interest (poi): A patch of interest (*.poi) can be exported to a GIFTI label file (*.label.gii) via the fourth option. This will be exported to a sparse datafile (with NIFTI_INTENT_NODE_INDEX). The intent of the patch of interest data block will be set to NIFTI_INTENT_LABEL.

Latest update of this page: December 16, 2010