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diff --git a/cuda/2d/dims.h b/cuda/2d/dims.h
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+/*
+-----------------------------------------------------------------------
+Copyright 2012 iMinds-Vision Lab, University of Antwerp
+
+Contact: astra@ua.ac.be
+Website: http://astra.ua.ac.be
+
+
+This file is part of the
+All Scale Tomographic Reconstruction Antwerp Toolbox ("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 _CUDA_DIMS_H
+#define _CUDA_DIMS_H
+
+namespace astraCUDA {
+
+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;
+};
+
+
+struct SDimensions {
+	unsigned int iVolWidth;
+	unsigned int iVolHeight;
+	unsigned int iProjAngles;
+	unsigned int iProjDets;
+	float fDetScale; // size of detector compared to volume pixels
+	unsigned int iRaysPerDet;
+	unsigned int iRaysPerPixelDim;
+};
+
+struct SDimensions3D {
+        unsigned int iVolX;
+        unsigned int iVolY;
+        unsigned int iVolZ;
+        unsigned int iProjAngles;
+        unsigned int iProjU; // number of detectors in the U direction
+        unsigned int iProjV; // number of detectors in the V direction
+};
+
+}
+
+#endif
+