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ecgtransform.m
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ecgtransform.m
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% BRAVEHEART - Open source software for electrocardiographic and vectorcardiographic analysis
% ecgtransform.m -- Transform ECG into VCG
% Copyright 2016-2024 Hans F. Stabenau and Jonathan W. Waks
%
% Source code/executables: https://github.com/BIVectors/BRAVEHEART
% Contact: [email protected]
%
% BRAVEHEART 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 3 of the License,
% or (at your option) any later version.
%
% BRAVEHEART 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, see <https://www.gnu.org/licenses/>.
%
% This software is for research purposes only and is not intended to diagnose or treat any disease.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function [X, Y, Z, VM] = ecgtransform(L1, L2, V1, V2, V3, V4, V5, V6, transform_matrix)
% Create matrix of leads V1, V2, V3, V4, V5, V6, I, II = Matrix E
E = [ V1, V2, V3, V4, V5, V6, L1, L2 ];
% Choose transformation matrix
switch transform_matrix
case 'Dower'
M = dowermatrix();
case 'Kors'
M = korsmatrix();
otherwise
error('Unknown transform_matrix: %s', transform_matrix);
end
VCG_matrix=M*E';
% Extract X, Y, Z coordinates from VCG_matrix
X=VCG_matrix(1 , :)';
Y=VCG_matrix(2 , :)';
Z=VCG_matrix(3 , :)';
% Vector magnitude lead
VM = sqrt(X.^2+Y.^2+Z.^2);
end