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diff --git a/utilities_LW/CTFPropagation_2D.m b/utilities_LW/CTFPropagation_2D.m
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+++ b/utilities_LW/CTFPropagation_2D.m
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+## Copyright (C) 2015 Loriane 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 3 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## CTFPropagation_2D
+
+## Author: Loriane Weber <lweber@gpid16a-1802>
+## Created: 2015-12-11
+
+function [ IdCTF ] = CTFPropagation_2D (ph, B, D, lambda, oversamp, ftot, gtot)
+
+
+[mp, np]=size(ph);
+[mp_a, np_a] = size(B);
+
+% check dimensions 
+	if (mp_a != mp || np_a != np)
+		disp('error in the dimensions !! Phi and B should have the same dimension')
+	return;
+	end
+
+% propagators in 2D (sin and cos)
+ssq=2*ssquare2(lambda*D, ftot', gtot', 1);
+csq=2*csquare2(lambda*D, ftot', gtot', 1);
+%keyboard
+% initialisation
+tmp_B=zeros(2*mp, 2*np);
+tmp_Phi=zeros(2*mp, 2*np);
+
+%tmp_B(1:mp,1:np)=B;
+%tmp_ph(1:mp,1:np)=ph;
+
+tmp_B=im_pad(B, 2*np, 2*mp, "zeros");
+tmp_Phi=im_pad(ph, 2*np, 2*mp, "zeros");
+		
+tmp_B=fft2(tmp_B);
+tmp_Phi=fft2(tmp_Phi);
+
+tmp_Id=-csq.*tmp_B + ssq.*tmp_Phi;
+tmp_Id=1+real(ifft2(tmp_Id)); 
+
+IdCTF=cut(tmp_Id, mp, np);
+
+	if oversamp==2
+	
+		ipf = [ 0.25 0.5 0.25; % modelise le binning du detecteur
+				0.50 1.0 0.50;
+				0.25 0.5 0.25];
+		Idd = conv2(IdCTF,ipf,'same')./conv2(ones(size(IdCTF)),ipf,'same');
+		Idd = Idd(oversamp:oversamp:end, oversamp:oversamp:end);
+		IdCTF=Idd; 
+		
+	elseif oversamp==4
+		ipf = [0.25 0.50 0.50 0.50 0.25;
+			   0.50 1.00 1.00 1.00 0.50;
+			   0.50 1.00 1.00 1.00 0.50;
+			   0.50 1.00 1.00 1.00 0.50;
+			   0.25 0.50 0.50 0.50 0.25];
+			   
+		Idd = conv2(IdCTF,ipf,'same')./conv2(ones(size(IdCTF)),ipf,'same');
+		Idd = Idd(oversamp:oversamp:end, oversamp:oversamp:end);
+		IdCTF=Idd;  
+			
+	end % end oversampling
+			
+
+
+
+
+endfunction