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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

BUGS

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