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dtpdview

Section: User Commands (1)
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NAME

dtpdview - Visualizes principal directions of diffusion tensors

SYNOPSIS

dtpdview -datadims <x> <y> <z> [-fathresh <threshold>] -maxcomponents <max tensors per voxel>

DESCRIPTION

This command acts as a wrapper to the more powerful pdview program. The pdview program has several additional capabilities. It can load any scalar volume (dtpdview always uses the fractional anisotropy) and visualise principal directions extracted with sfpeaks.

The program loads the eigensystem of a diffusion tensor data set and displays the fractional anisotropy and a 2D projection of the principal directions.

The program reads the eigen decomposition of a diffusion tensor volume, in the format produced by dteig. One or two tensors per voxel may be displayed. If there are two tensors in a voxel, the displayed anisotropy is the mean of the two tensor anisotropies.

The default plane view is axial and the user may switch to sagittal or coronal by clicking the buttons at the top of the screen. Next to the plane selection buttons is the currently selected slice, with the zoomed area outlined in yellow. Click anywhere on this image to centre the zoomed area. The main window shows the zoomed area in larger detail. The principal directions in each voxel are drawn as lines.

The default input data type is double.

OPTIONS

-datadims <x> <y> <z>: The dimensions of the image, in voxels.
-fathresh <value>: The fractional anisotropy threshold. The principal direction is not displayed in a voxel unless the anisotropy is greater than the specified value. The default is 0.
-maxcomponents <max tensors per voxel>: Maximum number of tensor components in each voxel. The default is 1.

EXAMPLES

Run dteig on a 128x128x60 tensor data set, and view the principal directions.

dteig -inputmodel dt < subjectA.Inv1.Bdouble | dtpdview -datadims 128 128 60

Read data from the file subjectA.Inv1.eig.Bdouble and display principal directions in white matter.

dtpdview -inputfile subjectA.Inv1.eig.Bdouble -datadims 128 128 60 -fathresh 0.15

Equivalently, use the pdview program (recommended)

pdview -inputfile subjectA.Inv1.eig.Bdouble -inputmodel dteig -datadims 128 128 60 -scalarthresh 0.15 -scalarrange 0 1.

Display principal directions for a multi-tensor volume (see multitenfit(1)).

dteig -inputmodel multitensor < subjectA.Inv32.Bdouble | dtpdview -datadims 128 128 60 -maxcomponents 2

AUTHORS

Philip Cook <p.cook@cs.ucl.ac.uk>

BUGS

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Time: 02:07:11 GMT, December 04, 2017

Dtpdview