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CT Reconstruction

Theoretically exact reconstruction for cone beam artifact-free CT imaging

A large aperture angle of the cone beam enables fast CT acquisition by exploiting a high share of the available tube power. However, cone beam artifacts increase with growing aperture angles when using conventional reconstruction techniques.

Complete scan trajectories (helix, circle+line, circle+arc)

The CERA-TXR algorithm overcomes this cone-beam angle limitation by theoretical exact reconstruction of complete scan trajectories, which fully sample the Radon space. Helical, circle-plus-line, and circle-plus-arc scan trajectories are supported for this end.

Left: 360° scan and FDK reconstruction. Right: Complete scan and TXR reconstruction
Left: 360° scan and FDK reconstruction. Right: Complete scan and TXR reconstruction

 

Variable-focus planar scan trajectories
Furthermore, the CERA-TXR algorithm supports planar trajectories in which the object-to-source and object-to-detector distances change continuously from projection to projection. Hence, elliptical trajectories can be reconstructed, for instance. Though, be aware that cone-beam artifact free images are only possible with a fully sampled Radon space.

Key advantages of CERA-TXR

  • Excellent and cone-beam artifact free images with complete scan trajectories
  • High scan speed by supporting a high helix pitch (e.g. whole detector can be used in helix)
  • Efficient scan of very long objects without image stitching
  • A large cone-beam angle better utilizes the tube power and thus supports high scan speeds
  • A large cone-beam angle helps to realize compact CT systems
Left: 360° scan and FDK reconstruction. Right: Complete scan and TXR reconstruction
Left: 360° scan and FDK reconstruction. Right: Complete scan and TXR reconstruction
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