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vcthreshselect

Section: User Commands (1)
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NAME

vcthreshselect - Visualizes F-test data from voxelclassify(1).

SYNOPSIS

vcthreshselect -datadims <x> <y> <z> -order <order> [-bgthresh <value> -csfthresh <value> -ftest <f1 f1 f3>]

DESCRIPTION

This program loads the raw F-test data from voxelclassify(1) and provides a preview of the voxel classification. Users can adjust the thresholds and update the classification in real time.

The default plane view is axial and the user may switch to sagittal or coronal by clicking the buttons. Left-clicking on a voxel sets crosshairs for quick slice selection. For example, if the current view is axial and the current slice is 20, clicking the voxel (50,60) will set the reslice crosshairs to (50,60,20). Clicking sagittal then automatically switches to the slice (x = 50), and clicking coronal switches to the slice (y = 60). Right-clicking removes the crosshairs.

The boxes at the bottom of the screen contain the thresholds (from left to right) for the order 2 model, the order 4 model, and the order 6 and above models. The scroll bars move the thresholds between 1E-1 and 1E-50. The text boxes also accept direct input of the form 1E-X (X between 1 and 50).

After thresholds are changed, the update button does the model selection with the new thresholds. This allows multiple changes to the thresholds without recalculating the classification. If auto update box is selected, the voxel classification will be updated immediately after any change to the thresholds.

The default input data type is double. The save button writes the current voxel classification as an int volume.

OPTIONS

-datadims <x> <y> <z>: The dimensions of the image, in voxels.
-order <maxOrder>: The maximum order in the f-test data.
-bgthresh <minA0>: Consider all voxels with A(0) less than minA0 to be background, regardless of the F-Test statistics.
-csfthresh <maxA0>: Consider all voxels with A(0) greater than maxA0 to be CSF (and therefore isotropic), regardless of the F-Test statistics.
-ftest <f1 f2 f3>: Specify the initial F-Test thresholds. Input must be in the range 1E-1 to 1E-50, and will be rounded to the nearest power of 10.

EXAMPLES

Run voxelclassify on a 128x128x60 data set, max order 4, and view results.

voxelclassify -inputfile SubjectA.Bfloat -schemefile A.scheme

-order 4 | vcthreshselect -datadims 128 128 60 -order 4
-bgthresh 100 -csfthresh 3000

AUTHORS

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

BUGS

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

Vcthreshselect