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Manpage of fa
fa
Section: User Commands (1)
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NAME
fa - Computes the fractional anisotropy of tensors.
SYNOPSIS
fa
[-inputmodel <dt|twotensor|threetensor|multitensor>]
DESCRIPTION
Reads diffusion tensor (single, two-tensor or three-tensor) data from
the standard input, computes the fractional anisotropy (FA) of each
tensor and outputs the results to the standard output. For
multiple-tensor data the program outputs the FA of each tensor, so
for three-tensor data, for example, the output contains three
fractional anisotropy values per voxel.
EXAMPLES
Compute the FA in each voxel of diffusion MRI data set SubjectA.Bfloat
and store the output in FA_A.Bdouble:
dtfit SubjectA.Bfloat test/A.scheme | fa > FA_A.Bdouble
Compute the FA for each component of the two-tensor fit to the same
data set:
twotenfit SubjectA.Bfloat test/A.scheme | fa -inputmodel twotensor > FA_A.Bdouble
Compute the FA for 10000 independent trials of fitting the diffusion
tensor to data synthesized from test function 1 (see datasynth(1))
using imaging scheme A.scheme and assuming signal to noise ratio of 16
at b=0:
datasynth -testfunc 1 -voxels 10000 -snr 16 -schemefile A.scheme | dtfit - A.scheme | fa > FA_A_SNR16.Bdouble
OPTIONS
- -inputmodel <model type>
-
Specifies the model that the input data contains parameters for.
Possible model types are: "dt" (diffusion-tensor data), "twotensor"
(two-tensor data), "threetensor" (three-tensor data), and "multitensor" (see multitenfit(1)).
By default, the program assumes that the input data contains a single diffusion tensor
in each voxel.
- -inputdatatype <data type of input>
-
Specifies the data type of the input file. The data type can be any
of the following strings: "char", "short", "int", "long", "float" or
"double". See camino(1).
- -outputdatatype <data type of output>
-
Specifies the data type of the output data. The data type can be any
of the following strings: "char", "short", "int", "long", "float" or
"double". See camino(1).
AUTHORS
Daniel Alexander <camino@cs.ucl.ac.uk>
SEE ALSO
trd(1), md(1), dtpds(1), dtfit(1), twotenfit(1), threetenfit(1), modelfit(1).
BUGS
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- EXAMPLES
-
- OPTIONS
-
- AUTHORS
-
- SEE ALSO
-
- BUGS
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