scan.dti.tract.file

Streams through the tract file and either counts the tracts, or
computes the bounding box of all their points, or both. Nothing but the
current chunk is ever held in memory, so this works on files of any size.

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) 

scan.dti.tract.file function

<dl><dt>filepath</dt>
<dd>character string, path to the <code>TCK</code> or <code>TSF</code> file
to read. Gzip-compressed files (i.e., <code>.tck.gz</code>) are supported and the
compression is detected from the file content, not the file name.</dd>
<dt>want</dt>
<dd>character vector, any combination of 'count' and 'bbox'.</dd>
<dt>chunk_values</dt>
<dd>integer, number of payload values to read per chunk.</dd></dl>

Arguments

Scan a tract file without holding its data in memory. — scan.dti.tract.file

<dl>

<dt>filepath</dt>
<dd>character string, path to the <code>TCK</code> or <code>TSF</code> file
to read. Gzip-compressed files (i.e., <code>.tck.gz</code>) are supported and the
compression is detected from the file content, not the file name.</dd>


<dt>want</dt>
<dd>character vector, any combination of 'count' and 'bbox'.</dd>


<dt>chunk_values</dt>
<dd>integer, number of payload values to read per chunk.</dd>

</dl>

scan.dti.tract.file: Scan a tract file without holding its data in memory.

Description

Usage

Value

Arguments