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CT Reconstruction

Sophisticated algorithms for CT artifact and noise reduction

The physics in cone-beam CT imaging are indeed complex and the typically assumed simplifications in the reconstruction process lead to image artifacts. The sophisticated algorithms in CERA-RED are designed to avoid or reduce these image artifacts. Moreover, the edge-preserving algorithms for noise reduction support low-dose imaging.

Metal artifact reduction (MAR)
Radiopaque and highly dense materials such as metal fillings in dental CT cause strong image artifacts, if not properly taken into account. The CERA metal artifact reduction significantly mitigates these image artifacts and preserves object details around the metals as far as possible.

Metal-artifact reduction example
Metal-artifact reduction example

 

Ring artifact reduction
Imperfect detector channels lead to concentric ring-artifacts which superimpose the object in the reconstructed volume. CERA-RED provides a bad-pixel correction in projection space and an iterative ring-artifact reduction in volume space to avoid or reduce these artifacts while preserving image details.

Ring-artifact reduction example
Ring-artifact reduction example

 

Noise reduction
Fast measurement times in industrial CT and low-dose dental CT imaging result in high noise levels in the projection images. The iterative algorithms in CERA-RED are designed to reduce noise while preserving image details.

Noise reduction example
Noise reduction example
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