trackvis.affine.to.rasmm

Computes the affine that turns the streamlines stored in a TRK
file into RAS+ mm coordinates in which a coordinate of (0,0,0) is the center
of the first voxel, which is the convention used by 'nibabel', DIPY and the
TRX format. The stored streamlines refer to the voxel corners and are in
"voxelmm" space, so this combines the stored matrix with the voxel sizes,
the half-voxel offset, and the orientation stored in the <code>voxel_order</code>
header field.

internal

Provides functions to read and write neuroimaging data in various file formats, with a focus on 'FreeSurfer' formats. This includes, but is not limited to, the following file formats: 1) MGH/MGZ/NIFTI format files, which can contain multi-dimensional images or other data. Typically they contain time-series of three-dimensional brain scans acquired by magnetic resonance imaging (MRI). They can also contain vertex-wise measures of surface morphometry data. The MGH format is named after the Massachusetts General Hospital, and the MGZ format is a compressed version of the same format. 2) 'FreeSurfer' morphometry data files in binary 'curv' format. These contain vertex-wise surface measures, i.e., one scalar value for each vertex of a brain surface mesh. These are typically values like the cortical thickness or brain surface area at each vertex. 3) Annotation file format. This contains a brain surface parcellation derived from a cortical atlas. 4) Surface file format. Contains a brain surface mesh, given by a list of vertices and a list of faces.

Tim Schc3<a4>fer

freesurferformats

Read and Write 'FreeSurfer' Neuroimaging File Formats

Tim Schäfer

Van Essen Lab 

Montreal Neurological Institute (MNI) 

trackvis.affine.to.rasmm function

<dl><dt>header</dt>
<dd>named list, the header of a TRK file as returned by
<code>read.dti.trk.header</code>.</dd></dl>

Arguments

Compute the affine that maps TrackVis coordinates to RAS+ mm. — trackvis.affine.to.rasmm

<dl>

<dt>header</dt>
<dd>named list, the header of a TRK file as returned by
<code>read.dti.trk.header</code>.</dd>

</dl>

trackvis.affine.to.rasmm: Compute the affine that maps TrackVis coordinates to RAS+ mm.

Description

Usage

Value

Arguments