parallel projectors now always use vector geometries internally

7 files changed, 99 insertions, 752 deletions

diff --git a/include/astra/ParallelBeamLineKernelProjector2D.h b/include/astra/ParallelBeamLineKernelProjector2D.h
index dd5eab2..5a10021 100644
--- a/include/astra/ParallelBeamLineKernelProjector2D.h
+++ b/include/astra/ParallelBeamLineKernelProjector2D.h
@@ -182,11 +182,6 @@ protected:
 	void projectBlock_internal(int _iProjFrom, int _iProjTo,
 	                           int _iDetFrom, int _iDetTo, Policy& _policy);
 
-	/** Internal policy-based projection of a range of angles and range.
- 	 * (_i*From is inclusive, _i*To exclusive) */
-	template <typename Policy>
-	void projectBlock_internal_vector(int _iProjFrom, int _iProjTo,
-	                                  int _iDetFrom, int _iDetTo, Policy& _policy);	
 };
 
 inline std::string CParallelBeamLineKernelProjector2D::getType() 
diff --git a/include/astra/ParallelBeamLineKernelProjector2D.inl b/include/astra/ParallelBeamLineKernelProjector2D.inl
index 69978b0..dc3153d 100644
--- a/include/astra/ParallelBeamLineKernelProjector2D.inl
+++ b/include/astra/ParallelBeamLineKernelProjector2D.inl
@@ -29,302 +29,52 @@ $Id$
 template <typename Policy>
 void CParallelBeamLineKernelProjector2D::project(Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
-		                      0, m_pProjectionGeometry->getDetectorCount(), p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(0, m_pProjectionGeometry->getProjectionAngleCount(),
-		                             0, m_pProjectionGeometry->getDetectorCount(), p);
-	}
+	projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
+		                  0, m_pProjectionGeometry->getDetectorCount(), p);
 }
 
 template <typename Policy>
 void CParallelBeamLineKernelProjector2D::projectSingleProjection(int _iProjection, Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(_iProjection, _iProjection + 1,
-	                          0, m_pProjectionGeometry->getDetectorCount(), p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(_iProjection, _iProjection + 1,
-	                                 0, m_pProjectionGeometry->getDetectorCount(), p);
-	}
+	projectBlock_internal(_iProjection, _iProjection + 1,
+	                      0, m_pProjectionGeometry->getDetectorCount(), p);
 }
 
 template <typename Policy>
 void CParallelBeamLineKernelProjector2D::projectSingleRay(int _iProjection, int _iDetector, Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(_iProjection, _iProjection + 1,
-	                      _iDetector, _iDetector + 1, p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(_iProjection, _iProjection + 1,
+	projectBlock_internal(_iProjection, _iProjection + 1,
 	                      _iDetector, _iDetector + 1, p);
-	}
 }
 
 
-//----------------------------------------------------------------------------------------
-// PROJECT BLOCK - default projection geometry
-template <typename Policy>
-void CParallelBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
-{
-	// variables
-	float32 theta, sin_theta, cos_theta, inv_sin_theta, inv_cos_theta, S, T, t, I, P, x, x2;
-	float32 lengthPerRow, updatePerRow, inv_pixelLengthX, lengthPerCol, updatePerCol, inv_pixelLengthY;
-	int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector, x1;
-	bool switch_t;
-
-	float32 old_theta;
-	const SParProjection * proj = 0;
-
-	const CParallelProjectionGeometry2D* pProjectionGeometry = dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry);
-
-	// loop angles
-	for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
-
-		// get theta
-		theta = m_pProjectionGeometry->getProjectionAngle(iAngle);
-		switch_t = false;
-		if (theta >= 7*PIdiv4) theta -= 2*PI;
-		if (theta >= 3*PIdiv4) {
-			theta -= PI;
-			switch_t = true;
-		}
-
-		// precalculate sin, cos, 1/cos
-		sin_theta = sin(theta);
-		cos_theta = cos(theta);
-		inv_sin_theta = 1.0f / sin_theta; 
-		inv_cos_theta = 1.0f / cos_theta; 
-
-		// precalculate kernel limits
-		lengthPerRow = m_pVolumeGeometry->getPixelLengthY() * inv_cos_theta;
-		updatePerRow = sin_theta * inv_cos_theta;
-		inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
-
-		// precalculate kernel limits
-		lengthPerCol = m_pVolumeGeometry->getPixelLengthX() * inv_sin_theta;
-		updatePerCol = cos_theta * inv_sin_theta;
-		inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
-
-		// precalculate S and T
-		S = 0.5f - 0.5f * ((updatePerRow < 0) ? -updatePerRow : updatePerRow);
-		T = 0.5f - 0.5f * ((updatePerCol < 0) ? -updatePerCol : updatePerCol);
-
-		// loop detectors
-		for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
-			
-			iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector;
-
-			// POLICY: RAY PRIOR
-			if (!p.rayPrior(iRayIndex)) continue;
-	
-			// get t
-			t = m_pProjectionGeometry->indexToDetectorOffset(iDetector);
-			if (switch_t) t = -t;
-
-			// vertically
-			if (theta <= PIdiv4) {
-			
-				// calculate x for row 0
-				P = (t - sin_theta * m_pVolumeGeometry->pixelRowToCenterY(0)) * inv_cos_theta;
-				x = (P - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX;
-
-				// get coords
-				int nextx1 = int((x > 0.0f) ? x : x-1.0f);
-				float nextx2 = x - nextx1;
-
-				// for each row
-				for (row = 0; row < m_pVolumeGeometry->getGridRowCount(); ++row) {
-
-					x1 = nextx1;
-					x2 = nextx2;
 
-					nextx2 += updatePerRow;
-					while (nextx2 >= 1.0f) {
-						nextx2 -= 1.0f;
-						nextx1++;
-					}
-					while (nextx2 < 0.0f) {
-						nextx2 += 1.0f;
-						nextx1--;
-					}
-
-					if (x1 < -1 || x1 > m_pVolumeGeometry->getGridColCount()) continue;
-
-					// left
-					if (x2 < 0.5f-S) {
-						I = (0.5f - S + x2) / (1.0f - 2.0f*S) * lengthPerRow;
-
-						if (x1-1 >= 0 && x1-1 < m_pVolumeGeometry->getGridColCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1-1);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-
-						if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-					}
-
-					// center
-					else if (x2 <= 0.5f+S) {
-						if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}					
-					}
-
-					// right
-					else  {
-						I = (1.5f - S - x2) / (1.0f - 2.0f*S) * lengthPerRow;
-
-						if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-						if (x1+1 >= 0 && x1+1 < m_pVolumeGeometry->getGridColCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1+1);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, lengthPerRow-I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-					}
-				}
-			}
-
-			// horizontally
-			else if (PIdiv4 <= theta && theta <= 3*PIdiv4) {
-
-				// calculate point P
-				P = (t - cos_theta * m_pVolumeGeometry->pixelColToCenterX(0)) * inv_sin_theta;
-				x = (m_pVolumeGeometry->getWindowMaxY() - P) * inv_pixelLengthY;
-
-				// get coords
-				int nextx1 = int((x > 0.0f) ? x : x-1.0f);
-				float nextx2 = x - nextx1;
-
-				// for each col
-				for (col = 0; col < m_pVolumeGeometry->getGridColCount(); ++col) {
-
-					x1 = nextx1;
-					x2 = nextx2;
-
-					nextx2 += updatePerCol;
-					while (nextx2 >= 1.0f) {
-						nextx2 -= 1.0f;
-						nextx1++;
-					}
-					while (nextx2 < 0.0f) {
-						nextx2 += 1.0f;
-						nextx1--;
-					}
-
-					if (x1 < -1 || x1 > m_pVolumeGeometry->getGridRowCount()) continue;
-
-					// up
-					if (x2 < 0.5f-T) {
-						I = (0.5f - T + x2) / (1.0f - 2.0f*T) * lengthPerCol;
-
-						if (x1-1 >= 0 && x1-1 < m_pVolumeGeometry->getGridRowCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1-1, col);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-
-						if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-					}
-
-					// center
-					else if (x2 <= 0.5f+T) {
-						if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}					
-					}
-
-					// down
-					else  {
-						I = (1.5f - T - x2) / (1.0f - 2.0f*T) * lengthPerCol;
-
-						if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-						if (x1+1 >= 0 && x1+1 < m_pVolumeGeometry->getGridColCount()) {
-							iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1+1, col);
-							// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-							if (p.pixelPrior(iVolumeIndex)) {
-								p.addWeight(iRayIndex, iVolumeIndex, lengthPerCol-I);
-								p.pixelPosterior(iVolumeIndex);
-							}
-						}
-					}
-				}
-			} // end loop col
-	
-			// POLICY: RAY POSTERIOR
-			p.rayPosterior(iRayIndex);
-	
-		} // end loop detector
-	} // end loop angles
-
-}
 
 //----------------------------------------------------------------------------------------
 // PROJECT BLOCK - vector projection geometry
 template <typename Policy>
-void CParallelBeamLineKernelProjector2D::projectBlock_internal_vector(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
+void CParallelBeamLineKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
 {
 	// variables
 	float32 detX, detY, S, T, I, x, y, c, r, update_c, update_r, offset;
 	float32 lengthPerRow, lengthPerCol, inv_pixelLengthX, inv_pixelLengthY, invTminSTimesLengthPerRow, invTminSTimesLengthPerCol;
-	int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector;
-
+	int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector, colCount, rowCount, detCount;
 	const SParProjection * proj = 0;
-	const CParallelVecProjectionGeometry2D* pVecProjectionGeometry = dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry);
 
+	// get vector geometry
+	const CParallelVecProjectionGeometry2D* pVecProjectionGeometry;
+	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
+		pVecProjectionGeometry = dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)->toVectorGeometry();
+	} else {
+		pVecProjectionGeometry = dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry);
+	}
+
+	// precomputations
 	inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
 	inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
-
-	int colCount = m_pVolumeGeometry->getGridColCount();
-	int rowCount = m_pVolumeGeometry->getGridRowCount();
+	colCount = m_pVolumeGeometry->getGridColCount();
+	rowCount = m_pVolumeGeometry->getGridRowCount();
+	detCount = pVecProjectionGeometry->getDetectorCount();
 
 	// loop angles
 	for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
@@ -333,17 +83,17 @@ void CParallelBeamLineKernelProjector2D::projectBlock_internal_vector(int _iProj
 
 		bool vertical = fabs(proj->fRayX) < fabs(proj->fRayY);
 		if (vertical) {
-			S = fabs(0.5f * (1.0f - proj->fRayY/proj->fRayX));
-			T = fabs(0.5f * (1.0f + proj->fRayY/proj->fRayX));
 			lengthPerRow = m_pVolumeGeometry->getPixelLengthX() * sqrt(proj->fRayY*proj->fRayY + proj->fRayX*proj->fRayX) / abs(proj->fRayY);
-			invTminSTimesLengthPerRow = lengthPerRow / (T - S);
 			update_c = -m_pVolumeGeometry->getPixelLengthY() * (proj->fRayX/proj->fRayY) * inv_pixelLengthX;
+			S = 0.5f - 0.5f*fabs(proj->fRayX/proj->fRayY);
+			T = 0.5f + 0.5f*fabs(proj->fRayX/proj->fRayY);
+			invTminSTimesLengthPerRow = lengthPerRow / (T - S);
 		} else {
-			S = fabs(0.5f * (1.0f - proj->fRayX/proj->fRayY));
-			T = fabs(0.5f * (1.0f + proj->fRayX/proj->fRayY));
 			lengthPerCol = m_pVolumeGeometry->getPixelLengthY() * sqrt(proj->fRayY*proj->fRayY + proj->fRayX*proj->fRayX) / abs(proj->fRayX);
-			invTminSTimesLengthPerCol = lengthPerCol / (T - S);
 			update_r = -m_pVolumeGeometry->getPixelLengthX() * (proj->fRayY/proj->fRayX) * inv_pixelLengthY;
+			S = 0.5f - 0.5f*fabs(proj->fRayY/proj->fRayX);
+			T = 0.5f + 0.5f*fabs(proj->fRayY/proj->fRayX);
+			invTminSTimesLengthPerCol = lengthPerCol / (T - S);
 		}
 
 		// loop detectors
@@ -495,4 +245,4 @@ void CParallelBeamLineKernelProjector2D::projectBlock_internal_vector(int _iProj
 		} // end loop detector
 	} // end loop angles
 
-}
\ No newline at end of file
+}
diff --git a/include/astra/ParallelBeamLinearKernelProjector2D.h b/include/astra/ParallelBeamLinearKernelProjector2D.h
index 3b84380..8e25c38 100644
--- a/include/astra/ParallelBeamLinearKernelProjector2D.h
+++ b/include/astra/ParallelBeamLinearKernelProjector2D.h
@@ -186,10 +186,6 @@ protected:
 	void projectBlock_internal(int _iProjFrom, int _iProjTo,
 	                           int _iDetFrom, int _iDetTo, Policy& _policy);
 
-	template <typename Policy>
-	void projectBlock_internal_vector(int _iProjFrom, int _iProjTo,
-	                                  int _iDetFrom, int _iDetTo, Policy& _policy);
-
 };
 
 //----------------------------------------------------------------------------------------
diff --git a/include/astra/ParallelBeamLinearKernelProjector2D.inl b/include/astra/ParallelBeamLinearKernelProjector2D.inl
index 04577de..9f898ce 100644
--- a/include/astra/ParallelBeamLinearKernelProjector2D.inl
+++ b/include/astra/ParallelBeamLinearKernelProjector2D.inl
@@ -26,195 +26,54 @@ along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
 $Id$
 */
 
-
 template <typename Policy>
 void CParallelBeamLinearKernelProjector2D::project(Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
-		                      0, m_pProjectionGeometry->getDetectorCount(), p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(0, m_pProjectionGeometry->getProjectionAngleCount(),
-		                             0, m_pProjectionGeometry->getDetectorCount(), p);
-	}
+	projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
+		                  0, m_pProjectionGeometry->getDetectorCount(), p);
 }
 
 template <typename Policy>
 void CParallelBeamLinearKernelProjector2D::projectSingleProjection(int _iProjection, Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(_iProjection, _iProjection + 1,
-	                          0, m_pProjectionGeometry->getDetectorCount(), p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(_iProjection, _iProjection + 1,
-	                                 0, m_pProjectionGeometry->getDetectorCount(), p);
-	}
+	projectBlock_internal(_iProjection, _iProjection + 1,
+	                      0, m_pProjectionGeometry->getDetectorCount(), p);
 }
 
 template <typename Policy>
 void CParallelBeamLinearKernelProjector2D::projectSingleRay(int _iProjection, int _iDetector, Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(_iProjection, _iProjection + 1,
-	                      _iDetector, _iDetector + 1, p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(_iProjection, _iProjection + 1,
+	projectBlock_internal(_iProjection, _iProjection + 1,
 	                      _iDetector, _iDetector + 1, p);
-	}
 }
 
-//----------------------------------------------------------------------------------------
-// PROJECT BLOCK
-template <typename Policy>
-void CParallelBeamLinearKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
-{
-	// variables
-	float32 theta, sin_theta, cos_theta, inv_sin_theta, inv_cos_theta, t;
-	float32 lengthPerRow, updatePerRow, inv_pixelLengthX;
-	float32 lengthPerCol, updatePerCol, inv_pixelLengthY;
-	bool switch_t;
-	int iAngle, iDetector, iVolumeIndex, iRayIndex;
-	int row, col, x1;
-	float32 P,x,x2;
 
-	// loop angles
-	for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
-
-		// get theta
-		theta = m_pProjectionGeometry->getProjectionAngle(iAngle);
-		switch_t = false;
-		if (theta >= 7*PIdiv4) theta -= 2*PI;
-		if (theta >= 3*PIdiv4) {
-			theta -= PI;
-			switch_t = true;
-		}
-
-		// precalculate sin, cos, 1/cos
-		sin_theta = sin(theta);
-		cos_theta = cos(theta);
-		inv_cos_theta = 1.0f / cos_theta; 
-		inv_sin_theta = 1.0f / sin_theta; 
-
-		// precalculate kernel limits
-		lengthPerRow = m_pVolumeGeometry->getPixelLengthY() * inv_cos_theta;
-		updatePerRow = sin_theta * inv_cos_theta;
-		inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
-
-		// precalculate kernel limits
-		lengthPerCol = m_pVolumeGeometry->getPixelLengthX() * inv_sin_theta;
-		updatePerCol = cos_theta * inv_sin_theta;
-		inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
-
-		// loop detectors
-		for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
-			
-			iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector;
-
-			// POLICY: RAY PRIOR
-			if (!p.rayPrior(iRayIndex)) continue;
-	
-			// get t
-			t = m_pProjectionGeometry->indexToDetectorOffset(iDetector);
-			if (switch_t) {
-				t = -t;
-			}
-
-			// vertically
-			if (theta <= PIdiv4) {
-			
-				// calculate x for row 0
-				P = (t - sin_theta * m_pVolumeGeometry->pixelRowToCenterY(0)) * inv_cos_theta;
-				x = m_pVolumeGeometry->coordXToColF(P) - 0.5f;
-
-				// for each row
-				for (row = 0; row < m_pVolumeGeometry->getGridRowCount(); ++row) {
-					
-					// get coords
-					x1 = int((x > 0.0f) ? x : x-1.0f);
-					x2 = x - x1; 
-					x += updatePerRow;
-
-					// add weights
-					if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridColCount()) {
-						iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1);
-						// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-						if (p.pixelPrior(iVolumeIndex)) {
-							p.addWeight(iRayIndex, iVolumeIndex, (1.0f - x2) * lengthPerRow);
-							p.pixelPosterior(iVolumeIndex);
-						}
-					}
-					if (x1+1 >= 0 && x1+1 < m_pVolumeGeometry->getGridColCount()) {
-						iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, x1+1);
-						// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-						if (p.pixelPrior(iVolumeIndex)) {
-							p.addWeight(iRayIndex, iVolumeIndex, (x2) * lengthPerRow);
-							p.pixelPosterior(iVolumeIndex);
-						}
-					}
-				}
-			}
-
-			// horizontally
-			else if (PIdiv4 <= theta && theta <= 3*PIdiv4) {
-
-				// calculate point P
-				P = (t - cos_theta * m_pVolumeGeometry->pixelColToCenterX(0)) * inv_sin_theta;
-				x = m_pVolumeGeometry->coordYToRowF(P) - 0.5f;
-
-				// for each row
-				for (col = 0; col < m_pVolumeGeometry->getGridColCount(); ++col) {
-
-					// get coords
-					x1 = int((x > 0.0f) ? x : x-1.0f);
-					x2 = x - x1; 
-					x += updatePerCol;
-
-					// add weights
-					if (x1 >= 0 && x1 < m_pVolumeGeometry->getGridRowCount()) {
-						iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1, col);
-						// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-						if (p.pixelPrior(iVolumeIndex)) {
-							p.addWeight(iRayIndex, iVolumeIndex, (1.0f - x2) * lengthPerCol);
-							p.pixelPosterior(iVolumeIndex);		
-						}
-					}
-					if (x1+1 >= 0 && x1+1 < m_pVolumeGeometry->getGridRowCount()) {
-						iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(x1+1, col);
-						// POLICY: PIXEL PRIOR + ADD + POSTERIOR
-						if (p.pixelPrior(iVolumeIndex)) {
-							p.addWeight(iRayIndex, iVolumeIndex, x2 * lengthPerCol);
-							p.pixelPosterior(iVolumeIndex);
-						}
-					}
-				}
-			}
-	
-			// POLICY: RAY POSTERIOR
-			p.rayPosterior(iRayIndex);
-	
-		} // end loop detector
-	} // end loop angles
-
-}
 
 //----------------------------------------------------------------------------------------
 // PROJECT BLOCK - vector projection geometry
 template <typename Policy>
-void CParallelBeamLinearKernelProjector2D::projectBlock_internal_vector(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
+void CParallelBeamLinearKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
 {
 	// variables
 	float32 detX, detY, x, y, c, r, update_c, update_r, offset;
 	float32 lengthPerRow, lengthPerCol, inv_pixelLengthX, inv_pixelLengthY;
-	int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector;
-
+	int iVolumeIndex, iRayIndex, row, col, iAngle, iDetector, colCount, rowCount, detCount;
 	const SParProjection * proj = 0;
-	const CParallelVecProjectionGeometry2D* pVecProjectionGeometry = dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry);
 
+	// get vector geometry
+	const CParallelVecProjectionGeometry2D* pVecProjectionGeometry;
+	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
+		pVecProjectionGeometry = dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)->toVectorGeometry();
+	} else {
+		pVecProjectionGeometry = dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry);
+	}
+
+	// precomputations
 	inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
 	inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
-
-	int colCount = m_pVolumeGeometry->getGridColCount();
-	int rowCount = m_pVolumeGeometry->getGridRowCount();
+	colCount = m_pVolumeGeometry->getGridColCount();
+	rowCount = m_pVolumeGeometry->getGridRowCount();
+	detCount = pVecProjectionGeometry->getDetectorCount();
 
 	// loop angles
 	for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
@@ -310,4 +169,4 @@ void CParallelBeamLinearKernelProjector2D::projectBlock_internal_vector(int _iPr
 	
 		} // end loop detector
 	} // end loop angles
-}
\ No newline at end of file
+}
diff --git a/include/astra/ParallelBeamStripKernelProjector2D.h b/include/astra/ParallelBeamStripKernelProjector2D.h
index c2bb0ed..8fb665f 100644
--- a/include/astra/ParallelBeamStripKernelProjector2D.h
+++ b/include/astra/ParallelBeamStripKernelProjector2D.h
@@ -184,12 +184,6 @@ protected:
 	void projectBlock_internal(int _iProjFrom, int _iProjTo,
 	                           int _iDetFrom, int _iDetTo, Policy& _policy);
 
-	/** Internal policy-based projection of a range of angles and range.
- 	 * (_i*From is inclusive, _i*To exclusive) */
-	template <typename Policy>
-	void projectBlock_internal_vector(int _iProjFrom, int _iProjTo,
-	                                  int _iDetFrom, int _iDetTo, Policy& _policy);
-
 };
 
 //----------------------------------------------------------------------------------------
diff --git a/include/astra/ParallelBeamStripKernelProjector2D.inl b/include/astra/ParallelBeamStripKernelProjector2D.inl
index 684408b..31d222a 100644
--- a/include/astra/ParallelBeamStripKernelProjector2D.inl
+++ b/include/astra/ParallelBeamStripKernelProjector2D.inl
@@ -29,305 +29,51 @@ $Id$
 template <typename Policy>
 void CParallelBeamStripKernelProjector2D::project(Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
-		                      0, m_pProjectionGeometry->getDetectorCount(), p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(0, m_pProjectionGeometry->getProjectionAngleCount(),
-		                             0, m_pProjectionGeometry->getDetectorCount(), p);
-	}
+	projectBlock_internal(0, m_pProjectionGeometry->getProjectionAngleCount(),
+		                  0, m_pProjectionGeometry->getDetectorCount(), p);
 }
 
 template <typename Policy>
 void CParallelBeamStripKernelProjector2D::projectSingleProjection(int _iProjection, Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(_iProjection, _iProjection + 1,
-	                          0, m_pProjectionGeometry->getDetectorCount(), p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(_iProjection, _iProjection + 1,
-	                                 0, m_pProjectionGeometry->getDetectorCount(), p);
-	}
+	projectBlock_internal(_iProjection, _iProjection + 1,
+	                      0, m_pProjectionGeometry->getDetectorCount(), p);
 }
 
 template <typename Policy>
 void CParallelBeamStripKernelProjector2D::projectSingleRay(int _iProjection, int _iDetector, Policy& p)
 {
-	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal(_iProjection, _iProjection + 1,
-	                      _iDetector, _iDetector + 1, p);
-	} else if (dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry)) {
-		projectBlock_internal_vector(_iProjection, _iProjection + 1,
+	projectBlock_internal(_iProjection, _iProjection + 1,
 	                      _iDetector, _iDetector + 1, p);
-	}
 }
+
 //----------------------------------------------------------------------------------------
 // PROJECT BLOCK
 template <typename Policy>
 void CParallelBeamStripKernelProjector2D::projectBlock_internal(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
 {
-	ASTRA_ASSERT(m_bIsInitialized);
-
-	// Some variables
-	float32 theta, t;
-	int row, col;
-	int iAngle;
-	int iDetector;
-	float32 res;
-	float32 PL, PLimitL, PLimitR;
-	float32 xL, xR, XLimitL, XLimitR;
-	int x1L,x1R;
-	float32 x2L, x2R, updateX;
-	int iVolumeIndex, iRayIndex;
-	
-	float32 sin_theta, cos_theta, inv_sin_theta, inv_cos_theta;
-	float32 fabs_sin_theta, fabs_cos_theta, fabs_inv_sin_theta, fabs_inv_cos_theta;
-	float32 PW, PH, DW, inv_PW, inv_PH;
-	float32 S, T, U, V, inv_4T;
-
-	// loop angles
-	for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
-		
-		// get values
-		theta = m_pProjectionGeometry->getProjectionAngle(iAngle);
-		bool switch_t = false;
-		if (theta >= 7*PIdiv4) theta -= 2*PI;
-		if (theta >= 3*PIdiv4) {
-			theta -= PI;
-			switch_t = true;
-		}
-
-		// Precalculate sin, cos, 1/cos
-		sin_theta = sin(theta);
-		cos_theta = cos(theta);
-		inv_cos_theta = 1.0f / cos_theta; 
-		inv_sin_theta = 1.0f / sin_theta;
-
-		fabs_sin_theta = (sin_theta < 0.0f) ? -sin_theta : sin_theta;
-		fabs_cos_theta = (cos_theta < 0.0f) ? -cos_theta : cos_theta;
-		fabs_inv_cos_theta = (inv_cos_theta < 0.0f) ? -inv_cos_theta : inv_cos_theta;
-		fabs_inv_sin_theta = (inv_sin_theta < 0.0f) ? -inv_sin_theta : inv_sin_theta;
-
-		// Other precalculations
-		PW = m_pVolumeGeometry->getPixelLengthX();
-		PH = m_pVolumeGeometry->getPixelLengthY();
-		DW = m_pProjectionGeometry->getDetectorWidth();
-		inv_PW = 1.0f / PW;
-		inv_PH = 1.0f / PH;
-
-		// [-45?,45?] and [135?,225?]
-		if (theta < PIdiv4) {
-
-			// Precalculate kernel limits
-			S = -0.5f * fabs_sin_theta * fabs_inv_cos_theta;
-			T = -S;
-			U = 1.0f + S;
-			V = 1.0f - S;
-			inv_4T = 0.25f / T;
-
-			updateX = sin_theta * inv_cos_theta;
-
-			// loop detectors
-			for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
-			
-				iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector;
-
-				// POLICY: RAY PRIOR
-				if (!p.rayPrior(iRayIndex)) continue;
-
-				// get t
-				t = m_pProjectionGeometry->indexToDetectorOffset(iDetector);
-				if (switch_t) t = -t;
-			
-				// calculate left strip extremes (volume coordinates)
-				PL = (t - sin_theta * m_pVolumeGeometry->pixelRowToCenterY(0) - DW*0.5f) * inv_cos_theta;
-				PLimitL = PL - 0.5f * fabs_sin_theta * fabs_inv_cos_theta * PH;
-				PLimitR = PLimitL + DW * inv_cos_theta + PH * fabs_sin_theta * fabs_inv_cos_theta; 
-
-				// calculate strip extremes (pixel coordinates)
-				XLimitL = (PLimitL - m_pVolumeGeometry->getWindowMinX()) * inv_PW;
-				XLimitR = (PLimitR - m_pVolumeGeometry->getWindowMinX()) * inv_PW;
-				xL = (PL - m_pVolumeGeometry->getWindowMinX()) * inv_PW;
-				xR = xL + (DW * inv_cos_theta) * inv_PW;
-	
-				// for each row
-				for (row = 0; row < m_pVolumeGeometry->getGridRowCount(); ++row) {
-				
-					// get strip extremes in column indices
-					x1L = int((XLimitL > 0.0f) ? XLimitL : XLimitL-1.0f);
-					x1R = int((XLimitR > 0.0f) ? XLimitR : XLimitR-1.0f);
-
-					// get coords w.r.t leftmost column hit by strip
-					x2L = xL - x1L; 
-					x2R = xR - x1L;
-					
-					// update strip extremes for the next row
-					XLimitL += updateX; 
-					XLimitR += updateX;
-					xL += updateX; 
-					xR += updateX; 
-
-					// for each affected col
-					for (col = x1L; col <= x1R; ++col) {
-
-						if (col < 0 || col >= m_pVolumeGeometry->getGridColCount()) { x2L -= 1.0f; x2R -= 1.0f;	continue; }
-
-						iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
-						// POLICY: PIXEL PRIOR
-						if (!p.pixelPrior(iVolumeIndex)) { x2L -= 1.0f; x2R -= 1.0f; continue; }
-						
-						// right
-						if (x2R >= V)		res = 1.0f;
-						else if (x2R > U)	res = x2R - (x2R-U)*(x2R-U)*inv_4T;
-						else if (x2R >= T)	res = x2R;
-						else if (x2R > S)	res = (x2R-S)*(x2R-S) * inv_4T;
-						else				{ x2L -= 1.0f; x2R -= 1.0f;	continue; }
-								
-						// left
-						if (x2L <= S)		{} // - 0.0f
-						else if (x2L < T)	res -= (x2L-S)*(x2L-S) * inv_4T;
-						else if (x2L <= U)	res -= x2L;
-						else if (x2L < V)	res -= x2L - (x2L-U)*(x2L-U)*inv_4T;
-						else				{ x2L -= 1.0f; x2R -= 1.0f;	continue; }
-
-						// POLICY: ADD
-						p.addWeight(iRayIndex, iVolumeIndex, PW*PH * res);
-
-						// POLICY: PIXEL POSTERIOR
-						p.pixelPosterior(iVolumeIndex);
-
-						x2L -= 1.0f;		
-						x2R -= 1.0f;
-
-					} // end col loop
-
-				} // end row loop
-
-				// POLICY: RAY POSTERIOR
-				p.rayPosterior(iRayIndex);
-
-			}	// end detector loop
-
-		// [45?,135?] and [225?,315?]
-		// horizontaly
-		} else {
-
-			// Precalculate kernel limits
-			S = -0.5f * fabs_cos_theta * fabs_inv_sin_theta;
-			T = -S;
-			U = 1.0f + S;
-			V = 1.0f - S;
-			inv_4T = 0.25f / T;
-
-			updateX = cos_theta * inv_sin_theta;
-
-			// loop detectors
-			for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
-			
-				iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector;
-
-				// POLICY: RAY PRIOR
-				if (!p.rayPrior(iRayIndex)) continue;
-
-				// get t
-				t = m_pProjectionGeometry->indexToDetectorOffset(iDetector);
-				if (switch_t) t = -t;
-			
-				// calculate left strip extremes (volume coordinates)
-				PL = (t - cos_theta * m_pVolumeGeometry->pixelColToCenterX(0) + DW*0.5f) * inv_sin_theta;
-				PLimitL = PL + 0.5f * fabs_cos_theta * fabs_inv_sin_theta * PW;
-				PLimitR = PLimitL - DW * inv_sin_theta - PH * fabs_cos_theta * fabs_inv_sin_theta; 
-
-				// calculate strip extremes (pixel coordinates)
-				XLimitL = (m_pVolumeGeometry->getWindowMaxY() - PLimitL) * inv_PH;
-				XLimitR = (m_pVolumeGeometry->getWindowMaxY() - PLimitR) * inv_PH;
-				xL = (m_pVolumeGeometry->getWindowMaxY() - PL) * inv_PH;
-				xR = xL + (DW * fabs_inv_sin_theta) * inv_PH;
-
-				// for each col
-				for (col = 0; col < m_pVolumeGeometry->getGridColCount(); ++col) {
-
-					// get strip extremes in column indices
-					x1L = int((XLimitL > 0.0f) ? XLimitL : XLimitL-1.0f);
-					x1R = int((XLimitR > 0.0f) ? XLimitR : XLimitR-1.0f);
-
-					// get coords w.r.t leftmost column hit by strip
-					x2L = xL - x1L; 
-					x2R = xR - x1L;
-					
-					// update strip extremes for the next row
-					XLimitL += updateX; 
-					XLimitR += updateX;
-					xL += updateX; 
-					xR += updateX; 
-
-					// for each affected col
-					for (row = x1L; row <= x1R; ++row) {
-
-						if (row < 0 || row >= m_pVolumeGeometry->getGridRowCount()) { x2L -= 1.0f; x2R -= 1.0f;	continue; }
-
-						iVolumeIndex = m_pVolumeGeometry->pixelRowColToIndex(row, col);
-
-						// POLICY: PIXEL PRIOR
-						if (!p.pixelPrior(iVolumeIndex)) { x2L -= 1.0f; x2R -= 1.0f; continue; }
-
-						// right
-						if (x2R >= V)		res = 1.0f;
-						else if (x2R > U)	res = x2R - (x2R-U)*(x2R-U)*inv_4T;
-						else if (x2R >= T)	res = x2R;
-						else if (x2R > S)	res = (x2R-S)*(x2R-S) * inv_4T;
-						else				{ x2L -= 1.0f; x2R -= 1.0f;	continue; }
-								
-						// left
-						if (x2L <= S)		{} // - 0.0f
-						else if (x2L < T)	res -= (x2L-S)*(x2L-S) * inv_4T;
-						else if (x2L <= U)	res -= x2L;
-						else if (x2L < V)	res -= x2L - (x2L-U)*(x2L-U)*inv_4T;
-						else				{ x2L -= 1.0f; x2R -= 1.0f;	continue; }
-
-						// POLICY: ADD
-						p.addWeight(iRayIndex, iVolumeIndex, PW*PH * res);
-
-						// POLICY: PIXEL POSTERIOR
-						p.pixelPosterior(iVolumeIndex);
-
-						x2L -= 1.0f;
-						x2R -= 1.0f;
-
-					} // end row loop
-
-				} // end col loop
-
-				// POLICY: RAY POSTERIOR
-				p.rayPosterior(iRayIndex);
-
-			} // end detector loop
-
-
-		} // end theta switch
-
-	} // end angle loop
-}
-
-//----------------------------------------------------------------------------------------
-// PROJECT BLOCK - vector projection geometry
-template <typename Policy>
-void CParallelBeamStripKernelProjector2D::projectBlock_internal_vector(int _iProjFrom, int _iProjTo, int _iDetFrom, int _iDetTo, Policy& p)
-{
 	// variables
-	float32 detX, detY, detLX, detLY, detRX, detRY, S, T, update_c, update_r, offsetL, offsetR, invTminS;
-	float32 lengthPerRow, lengthPerCol, inv_pixelLengthX, inv_pixelLengthY, pixelArea;
-	int iVolumeIndex, iRayIndex, iRayIndexL, iRayIndexR, row, row_top, row_bottom, col, col_left, col_right, iAngle, iDetector, colCount, rowCount;
-
+	float32 detLX, detLY, detRX, detRY, S, T, update_c, update_r, offsetL, offsetR, invTminS;
+	float32 inv_pixelLengthX, inv_pixelLengthY, pixelArea, res, fRxOverRy, fRyOverRx;
+	int iVolumeIndex, iRayIndex, iAngle, iDetector;
+	int row, row_top, row_bottom, col, col_left, col_right, colCount, rowCount, detCount;
 	const SParProjection * proj = 0;
-	const CParallelVecProjectionGeometry2D* pVecProjectionGeometry = dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry);
+	
+	// get vector geometry
+	const CParallelVecProjectionGeometry2D* pVecProjectionGeometry;
+	if (dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)) {
+		pVecProjectionGeometry = dynamic_cast<CParallelProjectionGeometry2D*>(m_pProjectionGeometry)->toVectorGeometry();
+	} else {
+		pVecProjectionGeometry = dynamic_cast<CParallelVecProjectionGeometry2D*>(m_pProjectionGeometry);
+	}
 
+	// precomputations
 	inv_pixelLengthX = 1.0f / m_pVolumeGeometry->getPixelLengthX();
 	inv_pixelLengthY = 1.0f / m_pVolumeGeometry->getPixelLengthY();
 	pixelArea = m_pVolumeGeometry->getPixelLengthX() * m_pVolumeGeometry->getPixelLengthY();
-
 	colCount = m_pVolumeGeometry->getGridColCount();
 	rowCount = m_pVolumeGeometry->getGridRowCount();
+	detCount = pVecProjectionGeometry->getDetectorCount();
 
 	// loop angles
 	for (iAngle = _iProjFrom; iAngle < _iProjTo; ++iAngle) {
@@ -336,27 +82,29 @@ void CParallelBeamStripKernelProjector2D::projectBlock_internal_vector(int _iPro
 
 		bool vertical = fabs(proj->fRayX) < fabs(proj->fRayY);
 		if (vertical) {
-			S = 0.5f - 0.5f*fabs(proj->fRayX/proj->fRayY);
-			T = 0.5f + 0.5f*fabs(proj->fRayX/proj->fRayY);
-			update_c = -m_pVolumeGeometry->getPixelLengthY() * (proj->fRayX/proj->fRayY) * inv_pixelLengthX;
+			fRxOverRy = proj->fRayX/proj->fRayY;
+			update_c = -m_pVolumeGeometry->getPixelLengthY() * fRxOverRy * inv_pixelLengthX;
+			S = 0.5f - 0.5f*fabs(fRxOverRy);
+			T = 0.5f + 0.5f*fabs(fRxOverRy);
 			invTminS = 1.0f / (T-S);
 		} else {
-			S = 0.5f - 0.5f*fabs(proj->fRayY/proj->fRayX);
-			T = 0.5f + 0.5f*fabs(proj->fRayY/proj->fRayX);
-			update_r = -m_pVolumeGeometry->getPixelLengthX() * (proj->fRayY/proj->fRayX) * inv_pixelLengthY;
+			fRyOverRx = proj->fRayY/proj->fRayX;
+			update_r = -m_pVolumeGeometry->getPixelLengthX() * fRyOverRx * inv_pixelLengthY;
+			S = 0.5f - 0.5f*fabs(fRyOverRx);
+			T = 0.5f + 0.5f*fabs(fRyOverRx);
 			invTminS = 1.0f / (T-S);
 		}
 
 		// loop detectors
 		for (iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) {
 			
-			iRayIndex = iAngle * m_pProjectionGeometry->getDetectorCount() + iDetector;
+			iRayIndex = iAngle * detCount + iDetector;
 
 			// POLICY: RAY PRIOR
 			if (!p.rayPrior(iRayIndex)) continue;
 	
-			detLX = proj->fDetSX + (iDetector+0.0f) * proj->fDetUX;
-			detLY = proj->fDetSY + (iDetector+0.0f) * proj->fDetUY;
+			detLX = proj->fDetSX + iDetector * proj->fDetUX;
+			detLY = proj->fDetSY + iDetector * proj->fDetUY;
 			detRX = detLX + proj->fDetUX;
 			detRY = detLY + proj->fDetUY;
 
@@ -364,9 +112,9 @@ void CParallelBeamStripKernelProjector2D::projectBlock_internal_vector(int _iPro
 			if (vertical) {
 
 				// calculate cL and cR for row 0
-				float32 xL = detLX + (proj->fRayX/proj->fRayY)*(m_pVolumeGeometry->pixelRowToCenterY(0)-detLY);
+				float32 xL = detLX + fRxOverRy*(m_pVolumeGeometry->pixelRowToCenterY(0)-detLY);
 				float32 cL = (xL - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX - 0.5f;
-				float32 xR = detRX + (proj->fRayX/proj->fRayY)*(m_pVolumeGeometry->pixelRowToCenterY(0)-detRY);
+				float32 xR = detRX + fRxOverRy*(m_pVolumeGeometry->pixelRowToCenterY(0)-detRY);
 				float32 cR = (xR - m_pVolumeGeometry->getWindowMinX()) * inv_pixelLengthX - 0.5f;
 
 				if (cR < cL) {
@@ -384,23 +132,23 @@ void CParallelBeamStripKernelProjector2D::projectBlock_internal_vector(int _iPro
 					if (col_left < 0) col_left = 0; 
 					if (col_right > colCount-1) col_right = colCount-1; 
 
+					offsetL = cL - float32(col_left);
+					offsetR = cR - float32(col_left);
+
 					// for each column
-					for (col = col_left; col <= col_right; ++col) {
+					for (col = col_left; col <= col_right; ++col, offsetL -= 1.0f, offsetR -= 1.0f) {
 
 						iVolumeIndex = row * colCount + col;
 
 						// POLICY: PIXEL PRIOR + ADD + POSTERIOR
 						if (p.pixelPrior(iVolumeIndex)) {
 
-							offsetL = cL - float32(col);
-							offsetR = cR - float32(col);
-
 							// right ray edge
-							float32 res = 0.0f;
 							if (T <= offsetR) 		res = 1.0f;
 							else if (S < offsetR) 	res = 1.0f - 0.5f*(T-offsetR)*(T-offsetR)*invTminS;
 							else if (-S < offsetR) 	res = 0.5f + offsetR;
 							else if (-T < offsetR) 	res = 0.5f*(offsetR+T)*(offsetR+T)*invTminS;
+							else 					res = 0.0f;
 
 							// left ray edge
 							if (T <= offsetL) 		res -= 1.0f;
@@ -408,7 +156,6 @@ void CParallelBeamStripKernelProjector2D::projectBlock_internal_vector(int _iPro
 							else if (-S < offsetL)  res -= 0.5f + offsetL;
 							else if (-T < offsetL)  res -= 0.5f*(offsetL+T)*(offsetL+T)*invTminS;
 
-
 							p.addWeight(iRayIndex, iVolumeIndex, pixelArea*res);
 							p.pixelPosterior(iVolumeIndex);
 						}
@@ -420,9 +167,9 @@ void CParallelBeamStripKernelProjector2D::projectBlock_internal_vector(int _iPro
 			else {
 
 				// calculate rL and rR for row 0
-				float32 yL = detLY + (proj->fRayY/proj->fRayX)*(m_pVolumeGeometry->pixelColToCenterX(0)-detLX);
+				float32 yL = detLY + fRyOverRx*(m_pVolumeGeometry->pixelColToCenterX(0)-detLX);
 				float32 rL = (m_pVolumeGeometry->getWindowMaxY() - yL) * inv_pixelLengthY - 0.5f;
-				float32 yR = detRY + (proj->fRayY/proj->fRayX)*(m_pVolumeGeometry->pixelColToCenterX(0)-detRX);
+				float32 yR = detRY + fRyOverRx*(m_pVolumeGeometry->pixelColToCenterX(0)-detRX);
 				float32 rR = (m_pVolumeGeometry->getWindowMaxY() - yR) * inv_pixelLengthY - 0.5f;
 
 				if (rR < rL) {
@@ -440,23 +187,23 @@ void CParallelBeamStripKernelProjector2D::projectBlock_internal_vector(int _iPro
 					if (row_top < 0) row_top = 0; 
 					if (row_bottom > rowCount-1) row_bottom = rowCount-1; 
 
+					offsetL = rL - float32(row_top);
+					offsetR = rR - float32(row_top);
+
 					// for each row
-					for (row = row_top; row <= row_bottom; ++row) {
+					for (row = row_top; row <= row_bottom; ++row, offsetL -= 1.0f, offsetR -= 1.0f) {
 
 						iVolumeIndex = row * colCount + col;
 
 						// POLICY: PIXEL PRIOR + ADD + POSTERIOR
 						if (p.pixelPrior(iVolumeIndex)) {
 
-							offsetL = rL - float32(row);
-							offsetR = rR - float32(row);
-
 							// right ray edge
-							float32 res = 0.0f;
 							if (T <= offsetR) 		res = 1.0f;
 							else if (S < offsetR) 	res = 1.0f - 0.5f*(T-offsetR)*(T-offsetR)*invTminS;
 							else if (-S < offsetR) 	res = 0.5f + offsetR;
 							else if (-T < offsetR) 	res = 0.5f*(offsetR+T)*(offsetR+T)*invTminS;
+							else 					res = 0.0f;
 
 							// left ray edge
 							if (T <= offsetL) 		res -= 1.0f;
diff --git a/include/astra/ParallelProjectionGeometry2D.h b/include/astra/ParallelProjectionGeometry2D.h
index 2f7d36f..36b4b6f 100644
--- a/include/astra/ParallelProjectionGeometry2D.h
+++ b/include/astra/ParallelProjectionGeometry2D.h
@@ -30,6 +30,7 @@ $Id$
 #define _INC_ASTRA_PARALLELPROJECTIONGEOMETRY2D
 
 #include "ProjectionGeometry2D.h"
+#include "ParallelVecProjectionGeometry2D.h"
 
 namespace astra
 {
@@ -134,7 +135,7 @@ public:
 	 * @param _sType geometry type to compare to.
 	 * @return true if _sType == "parallel".
 	 */
-	 virtual bool isOfType(const std::string& _sType);
+	virtual bool isOfType(const std::string& _sType);
 
 	/** Get all settings in a Config object.
 	 *
@@ -151,7 +152,12 @@ public:
 	 *
 	 * @return a unit vector describing the direction
 	 */
-	 virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex = 0);
+	virtual CVector3D getProjectionDirection(int _iProjectionIndex, int _iDetectorIndex = 0);
+
+	/** Create a vector geom
+	*/
+	CParallelVecProjectionGeometry2D* toVectorGeometry();
+
 };
 
 } // namespace astra