dirgen¶
Synopsis¶
dirgen [ options ] ndir dirs
- ndir: the number of directions to generate.
- dirs: the text file to write the directions to, as [ az el ] pairs.
Description¶
generate a set of uniformly distributed directions using a bipolar electrostatic repulsion model.
Options¶
- -power exp specify exponent to use for repulsion power law (default: 2). This must be a power of 2 (i.e. 2, 4, 8, 16, ...).
- -niter num specify the maximum number of iterations to perform (default: 10000).
- -unipolar optimise assuming a unipolar electrostatic repulsion model rather than the bipolar model normally assumed in DWI
- -cartesian Output the directions in Cartesian coordinates [x y z] instead of [az el].
Standard options¶
- -info display information messages.
- -quiet do not display information messages or progress status.
- -debug display debugging messages.
- -force force overwrite of output files. Caution: Using the same file as input and output might cause unexpected behaviour.
- -nthreads number use this number of threads in multi-threaded applications (set to 0 to disable multi-threading)
- -failonwarn terminate program if a warning is produced
- -help display this information page and exit.
- -version display version information and exit.
References¶
Jones, D.; Horsfield, M. & Simmons, A. Optimal strategies for measuring diffusion in anisotropic systems by magnetic resonance imaging. Magnetic Resonance in Medicine, 1999, 42: 515-525
Papadakis, N. G.; Murrills, C. D.; Hall, L. D.; Huang, C. L.-H. & Adrian Carpenter, T. Minimal gradient encoding for robust estimation of diffusion anisotropy. Magnetic Resonance Imaging, 2000, 18: 671-679
Author: J-Donald Tournier (jdtournier@gmail.com)
Copyright: Copyright (c) 2008-2016 the MRtrix3 contributors
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