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Manpage of qballmx
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
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Time: 02:06:54 GMT, December 10, 2011