Exporting a surface map (*.smp)

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 rangeIntent 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.

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Latest update of this page: May 17, 2009