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ctf_channel_unit.m
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ctf_channel_unit.m
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function [sens_unit] = ctf_channel_unit(ctf)
% ctf_channel_unit - project CTF channel locations onto a unit sphere
%
% [sens_unit] = ctf_channel_unit(ctf)
%
% sens_unit output is a projection of all the CTF sensor locations onto a
% unit sphere, assuming the origin is at (0,0,0). The output vector is Nx3
% Cartesian coordinates.
%
% <>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
% < >
% < DISCLAIMER: >
% < >
% < THIS PROGRAM IS INTENDED FOR RESEARCH PURPOSES ONLY. >
% < THIS PROGRAM IS IN NO WAY INTENDED FOR CLINICAL OR >
% < OFFICIAL USE. >
% < >
% <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>
%
% $Revision: 1.1 $ $Date: 2009-01-30 03:49:26 $
% Copyright (C) 2005 Darren L. Weber
%
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License
% as published by the Free Software Foundation; either version 2
% of the License, or (at your option) any later version.
%
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
% Modified: 01/2005, Darren.Weber_at_radiology.ucsf.edu
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
ver = '$Revision: 1.1 $ $Date: 2009-01-30 03:49:26 $';
fprintf('\nCTF_CHANNEL_UNIT [v %s]\n',ver(11:15));
% translate the CTF sensors into a unit sphere,
% assuming the origin is at (0,0,0)
sens = ctf.sensor.location';
distance = sqrt( sens(:,1).^2 + sens(:,2).^2 + sens(:,3).^2 );
distance = repmat(distance,1,3);
sens_unit = sens ./ distance;
return