mghheader.centervoxelRAS.from.firstvoxelRAS

Compute RAS coords of center voxel.

Provides functions to read and write neuroimaging data in various file formats, with a focus on 'FreeSurfer' <http://freesurfer.net/> formats. This includes, but is not limited to, the following file formats: 1) MGH/MGZ 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

mghheader.centervoxelRAS.from.firstvoxelRAS function

<dl><dt>header</dt>
<dd>Header of the mgh datastructure, as returned by <code>read.fs.mgh</code>. The `c_r`, `c_a` and `c_s` values in the header do not matter of course, they are what is computed by this function.</dd>
<dt>first_voxel_RAS</dt>
<dd>numerical vector of length 3, the RAS coordinate of the first voxel in the volume. The first voxel is the voxel with `CRS=1,1,1` in R, or `CRS=0,0,0` in C/FreeSurfer. This value is also known as *P0 RAS*.</dd></dl>

Arguments

Compute RAS coords of center voxel. — mghheader.centervoxelRAS.from.firstvoxelRAS

<dl>

<dt>header</dt>
<dd>Header of the mgh datastructure, as returned by <code>read.fs.mgh</code>. The `c_r`, `c_a` and `c_s` values in the header do not matter of course, they are what is computed by this function.</dd>


<dt>first_voxel_RAS</dt>
<dd>numerical vector of length 3, the RAS coordinate of the first voxel in the volume. The first voxel is the voxel with `CRS=1,1,1` in R, or `CRS=0,0,0` in C/FreeSurfer. This value is also known as *P0 RAS*.</dd>

</dl>

mghheader.centervoxelRAS.from.firstvoxelRAS: Compute RAS coords of center voxel.

Description

Usage

Value

Arguments