Project PHASETOMO Results Development of a Computer platform | Development of a Computer platform for Phase Contrast Tomosynthesis |
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The in-house developed computer platform for PhC tomosynthesis allows producing of planar projection images in PhC mode using free propagation (Fig.2). Modelling and simulation of wave propagation through the imaging system were implemented based on the Fresnel-Kirchhoff diffraction integral. PhC effects are modelled and applied for both simple and complex (anthropomorphic) phantoms, which can be voxel-based or analytically described.
Figure 2. Steps in the simulation of PhC tomosynthesis
Next, several classic reconstruction algorithms have been adopted and further developed for the purpose of PhC tomosynthesis. These include the Multiple Projection Algorithm (MPA) initially developed at BITU, which was now adapted for a common synchrotron acquisition geometry – isocentric rotational scanning with fixed x-ray source and detector position and rotating object. Improvements as accounting for a misplacement of the detector and corresponding geometrical correction of the images were additionally implemented. Shift-And-Add (SAA) and the Filtered Back-Projection (FBP) algorithms were also implemented for PhC tomosynthesis.
Figure 3. Experimentally obtained PhC projection images and computed tomosynthesis slices
The implemented algorithms were added to the computer platform for PhC tomosynthesis.
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