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Manpage of trd
trd
Section: User Commands (1)
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NAME
trd - Computes the trace of tensors.
SYNOPSIS
trd
[-inputmodel <dt|twotensor|threetensor|multitensor>]
DESCRIPTION
Reads diffusion tensor (single, two-tensor or three-tensor) data from
the standard input, computes the trace of each tensor, i.e., three
times the mean diffusivity, and outputs the results to the standard
output. For multiple-tensor data the program outputs the trace of
each tensor, so for three-tensor data, for example, the output
contains three values per voxel.
Divide the output by three to get the mean diffusivity.
EXAMPLES
Compute Tr(D) in each voxel of diffusion MRI data set SubjectA.Bfloat
and store the output in TrD_A.Bdouble:
dtfit SubjectA.Bfloat test/A.scheme | trd > TrD_A.Bdouble
Compute Tr(D) for each component of the two-tensor fit to the same
data set:
twotenfit SubjectA.Bfloat test/A.scheme | trd -inputmodel twotensor > TrD_A.Bdouble
Compute Tr(D) 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 | trd > TrD_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). 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".
- -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
md(1), fa(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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