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Objective

To develop an open-source software for fast cone-beam CT reconstruction. Subsequently, the library could be extended to other modalities and geometries, and used for 2D/3D registration.

Requirements

• 2D pre-processing (raw-data to attenuation images, i.e. logarithm, ghosting and scatter correction, etc…);
• 2D Fourier filtering (or 1D per line/column);
• 3D => 2D forward projection;
• 2D => 3D backprojection;
• Respiratory signal extraction;
• 3D => 3D => 2D deformable forward projection;
• 2D => 3D => 3D deformable backprojection.

File formats for projection images

• Any ITK image file format
• Elekta Synergy (.his)
• Varian OBI 1.3 (.hnd)

File formats for geometry

List of parameters to describe the Elekta Synergy geometry:

• Source-to-isocenter distance (1000 mm)
• Source-to-detector distance (mm)
• Detector width and height (mm)
• For each projection: gantry angle (°) and projected isocenter position (mm)

Other solutions

• Plastimatch
• STIR
• VTKEdge
• ITK
• Aspire
• OSCaR