• View
• Edit
• History
• Print

Md

Content-type: text/html

trd

Section: User Commands (1)
Index Return to Main Contents

---

 

NAME

md - Computes the mean diffusivity (trace/3) from diffusion tensors.

 

SYNOPSIS

md [-inputmodel <dt|twotensor|threetensor|multitensor>]

 

DESCRIPTION

Reads diffusion tensor (single, two-tensor or three-tensor) data from the standard input, computes the mean diffusivity, ie trace/3, of each tensor and outputs the results to the standard output. For multiple-tensor data the program outputs the mean diffusivity of each tensor, so for three-tensor data, for example, the output contains three values per voxel.

 

EXAMPLES

Compute MD in each voxel of diffusion MRI data set SubjectA.Bfloat and store the output in MD_A.Bdouble:

dtfit SubjectA.Bfloat test/A.scheme | md > MD_A.Bdouble

Compute MD for each component of the two-tensor fit to the same data set:

twotenfit SubjectA.Bfloat test/A.scheme | md -inputmodel twotensor > MD_A.Bdouble

Compute MD 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 | md > MD_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

trd(1), fa(1), dtpds(1), dtfit(1), twotenfit(1), threetenfit(1), modelfit(1).

 

BUGS

---

 

Index

NAME

SYNOPSIS

DESCRIPTION

EXAMPLES

OPTIONS

AUTHORS

SEE ALSO

BUGS

---

This document was created by man2html, using the manual pages.
Time: 02:07:11 GMT, December 04, 2017