diff options
Diffstat (limited to 'include/astra')
| -rw-r--r-- | include/astra/ParallelBeamDistanceDrivenProjector2D.inl | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/astra/ParallelBeamDistanceDrivenProjector2D.inl b/include/astra/ParallelBeamDistanceDrivenProjector2D.inl index aedcee9..3a18c6f 100644 --- a/include/astra/ParallelBeamDistanceDrivenProjector2D.inl +++ b/include/astra/ParallelBeamDistanceDrivenProjector2D.inl @@ -72,7 +72,7 @@ void CParallelBeamDistanceDrivenProjector2D::projectBlock_internal(int _iProjFro const int rowCount = m_pVolumeGeometry->getGridRowCount(); // Performance note: - // This is not a very well optimizated version of the distance driven + // This is not a very well optimized version of the distance driven // projector. The CPU projector model in ASTRA requires ray-driven iteration, // which limits re-use of intermediate computations. @@ -86,6 +86,9 @@ void CParallelBeamDistanceDrivenProjector2D::projectBlock_internal(int _iProjFro const float32 Ex = m_pVolumeGeometry->getWindowMinX() + pixelLengthX*0.5f; const float32 Ey = m_pVolumeGeometry->getWindowMaxY() - pixelLengthY*0.5f; + const float32 rayWidth = fabs(proj->fDetUX * proj->fRayY - proj->fDetUY * proj->fRayX) / + sqrt(proj->fRayX * proj->fRayX + proj->fRayY * proj->fRayY); + // loop detectors for (int iDetector = _iDetFrom; iDetector < _iDetTo; ++iDetector) { @@ -100,7 +103,7 @@ void CParallelBeamDistanceDrivenProjector2D::projectBlock_internal(int _iProjFro if (vertical) { const float32 RxOverRy = proj->fRayX/proj->fRayY; - const float32 lengthPerRow = m_pVolumeGeometry->getPixelLengthX() * m_pVolumeGeometry->getPixelLengthY(); + const float32 lengthPerRow = m_pVolumeGeometry->getPixelLengthX() * m_pVolumeGeometry->getPixelLengthY() / rayWidth; const float32 deltac = -pixelLengthY * RxOverRy * inv_pixelLengthX; const float32 deltad = 0.5f * fabs((proj->fDetUX - proj->fDetUY * RxOverRy) * inv_pixelLengthX); @@ -157,7 +160,7 @@ void CParallelBeamDistanceDrivenProjector2D::projectBlock_internal(int _iProjFro } else { const float32 RyOverRx = proj->fRayY/proj->fRayX; - const float32 lengthPerCol = m_pVolumeGeometry->getPixelLengthX() * m_pVolumeGeometry->getPixelLengthY(); + const float32 lengthPerCol = m_pVolumeGeometry->getPixelLengthX() * m_pVolumeGeometry->getPixelLengthY() / rayWidth; const float32 deltar = -pixelLengthX * RyOverRx * inv_pixelLengthY; const float32 deltad = 0.5f * fabs((proj->fDetUY - proj->fDetUX * RyOverRx) * inv_pixelLengthY); |