transform.flip.handedness

Changing the convention of the coordinates that a transformation maps flips the sign of its first
two axes on each side of the transformation that changes: the input side by multiplying the matrix from the
right and the output side by multiplying it from the left, with a diagonal matrix that negates x and y. That
matrix is its own inverse, which is why the conversion in both directions is the same operation.

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) 

transform.flip.handedness function

<dl><dt>tf</dt>
<dd>an <code>fs.transform</code> instance.</dd>
<dt>target</dt>
<dd>character string, either 'ras' or 'lps'.</dd></dl>

Arguments

Convert a transformation between the LPS and the RAS convention. — transform.flip.handedness

<dl>

<dt>tf</dt>
<dd>an <code>fs.transform</code> instance.</dd>


<dt>target</dt>
<dd>character string, either 'ras' or 'lps'.</dd>

</dl>

transform.flip.handedness: Convert a transformation between the LPS and the RAS convention.

Description

Usage

Value

Arguments