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qballmx

Section: User Commands (1)
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NAME

qballmx - Creates a reconstruction matrix for Q-Ball

 

SYNOPSIS

qballmx -schemefile <filename>  

DESCRIPTION

Generates a reconstruction matrix for Q-Ball. Used to reconstruct data acquired with the scheme specified in <scheme file> using linrecon.

 

EXAMPLES

Generates a linear inversion matrix for the scheme A.scheme using:

# Create a linear transform matrix for Q-Ball. This command uses the default setting of rbf sigma = 0.2618 (15 degrees), data smoothing sigma = 0.1309 (7.5 degrees), rbf pointset 246

qballmx -schemefile A.scheme > A_QBALLMX.Bdouble

The settings used for the basis functions are displayed using the error stream. It is advised that you save these settings for future reference.

Further examples:


 1. Using Radial Basis Functions
 # Create the inversion matrix
 qballmx -schemefile A.scheme -basistype rbf -rbfpointset 246 -rbfsigma 0.2618 -smoothingsigma 0.1309 > A_QBALLMX.Bdouble
 
 # Run it over each voxel
 linrecon SubjectA.Bfloat A.scheme A_QBALLMX.Bdouble -normalize > QBallCoeffsA.Bdouble

2. Using Spherical Harmonics


 # Create the inversion matrix
 qballmx -schemefile A.scheme -basistype sh -order 4 > A_QBALLMX.Bdouble


 # Run it over each voxel
 linrecon SubjectA.Bfloat A.scheme A_QBALLMX.Bdouble -normalize > QBallCoeffsA.Bdouble

 

OPTIONS

General options:

-basistype <basis function type>

                rbf - use radial basis functions                                sh - use
spherical harmonics

-schemefile <Scheme file name>
See modelfit(1).

Specific to radial basis functions (rbf):

-rbfpointset <pointset to use>
               sets the number of radial basis functions to use. The value specified
must be present in the Pointsets directory. The default value is 246

-rbfsigma <rbf width>
               sets the width of the basis functions used for interpolation. If not
specified, a default value of 0.2618 is used.   

-smoothingsigma <rbf width>
               sets the width of the basis functions used to smooth the data.  If this
flag is omitted, a default value of 0.1309 is used.     

Specific to spherical harmonics (sh):

-order <maximum order>
               maximum order of the spherical harmonic series  

 

SEE ALSO

linrecon(1).

 

BUGS


 

Index

NAME
SYNOPSIS
DESCRIPTION
EXAMPLES
OPTIONS
SEE ALSO
BUGS

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