read.dti.bval

Reads the b-values of a diffusion MRI dataset, i.e. the
diffusion weighting of each volume in units of s/mm^2. This implements the
bvals part of the FSL format: a plain text file with one value per
volume, usually in a single row. The HCP variant, which stores one value
per line, is read as well.

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) 

read.dti.bval function

<dl><dt>filepath</dt>
<dd>character string, path to the b-values file, typically
ending in <code>.bval</code> or <code>.bvals</code>, but without an extension in the HCP layout.</dd>
<dt>layout</dt>
<dd>character string, one of 'auto', 'components' or 'volumes'.
<code>components</code> means that the file stores the values in a single line (the
FSL layout), <code>volumes</code> means one value per line (the HCP layout). With
'auto' (the default), the layout is derived from the file content.</dd></dl>

Arguments

Read b-values from a FSL-style bvals file. — read.dti.bval

<dl>

<dt>filepath</dt>
<dd>character string, path to the b-values file, typically
ending in <code>.bval</code> or <code>.bvals</code>, but without an extension in the HCP layout.</dd>


<dt>layout</dt>
<dd>character string, one of 'auto', 'components' or 'volumes'.
<code>components</code> means that the file stores the values in a single line (the
FSL layout), <code>volumes</code> means one value per line (the HCP layout). With
'auto' (the default), the layout is derived from the file content.</dd>

</dl>

read.dti.bval: Read b-values from a FSL-style bvals file.

Description

Usage

Value

Arguments

See Also