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diff --git a/include/astra/GeometryUtil2D.h b/include/astra/GeometryUtil2D.h
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+/*
+-----------------------------------------------------------------------
+Copyright: 2010-2015, iMinds-Vision Lab, University of Antwerp
+           2014-2015, CWI, Amsterdam
+
+Contact: astra@uantwerpen.be
+Website: http://sf.net/projects/astra-toolbox
+
+This file is part of the ASTRA Toolbox.
+
+
+The ASTRA Toolbox 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.
+
+The ASTRA Toolbox 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 the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
+
+-----------------------------------------------------------------------
+$Id$
+*/
+
+#ifndef _INC_ASTRA_GEOMETRYUTIL2D
+#define _INC_ASTRA_GEOMETRYUTIL2D
+
+namespace astra {
+
+struct SFanProjection {
+        // the source
+        float fSrcX, fSrcY;
+
+        // the start of the (linear) detector
+        float fDetSX, fDetSY;
+
+        // the length of a single detector pixel
+        float fDetUX, fDetUY;
+};
+
+}
+
+#endif