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NIfTI1 in BrainVoyager QX

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How BrainVoyager QX supports the NIfTI 1.1 data format

Conversion to BrainVoyager formats

This page describes how BrainVoyager QX supports the NIfTI 1.1 data format.

The table below describes which conversions can be performed via the BrainVoyager QX conversion plugin.

 

Format

IMPORT

Details

EXPORT

Details

 

 

 

 

 

VMR

yes

- reoriented to sagittal

- rescaling to 1mm3 (to isovoxel)

- zero fill to 256 x 256 x 256

yes

- orientation w.r.t. scanner preserved in qform matrix

- sform:

if in Talairach space, sform code = NIFTI_XFORM_UNKNOWN

sform fields: empty

 else, sform_code = NIFTI_XFORM_ALIGNED_ANAT

sform fields: (composed) transformation matrix

FMR

yes

yes

- orientation w.r.t. scanner preserved in qform matrix

AMR

yes

- resized to 256 x 256 pixels

- rescale intensities between 0-255

yes

 

MAP

yes

 

yes

- cal_max and cal_min set, dependent from map type

VMP

yes

- resized to 256 x 256 x 256 voxels

- resolution 1mm3 (same as VMR)

- if map type unknown, set to t-test

- currently only the first map

- rescale values, range dependent from map type

yes

- data are reoriented to default in NIfTI-coordinate system

- cal_max and cal_min set, dependent from map type

VTC

yes

- rescaling to 3mm3 (to isovoxel)

yes

- data are reoriented to default in NIfTI-coordinate system

- to data type float (32 bit)

GLM

no

 

yes

- choice of statistical map type that can be exported

possible types: beta weights, x*y, mean corrected sum of squares, multiple regression coefficient, mean time course, auto-correlation of order 1 (when present).

Currently, all map types are set in the NIfTI-1 header to 'correlation'. In the next version, this will be improved.

SRF

no

possible with NIfTI 2.0

under consideration

- export of vertex coordinates and triangles to separate files

- dim[0] set to '5'

MTC

no

possible with NIfTI 2.0

under consideration

SMP

no

possible with NIfTI 2.0

under consideration

dim[0] set to '5'

dim[5] indicates number of statistical maps

supported SMP versions: 1-3

Among the currently unsupported features of the NIfTI-1 format are:

  • Extensions
  • Complex data types, RGB type
  • Compressed files
Created by Data Format Working Group
Last modified 2006-03-29 20:17
 

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