University Health Network

Elekta Ab (publ)

Elekta Ab

Bjorn Nutti

David Anthony Jaffray

Håkan Nordström

Jonas Anders Adler

Marcus Hennix

Gregory Bootsma

Markus Eriksson

Frank Verhaegen

Hakan Nordstrom

Embodiments disclose a method performed by at least one processor for processing a plurality of x-ray projection images of a subject, the method comprising a plurality of operations including reconstructing the projection images to yield a volume reconstruction; segmenting the reconstructed volume by assigning a material type to each voxel; estimating a first set of scatter images corresponding to a subset of the projection images by calculating probabilistic predictions of interactions of x-rays with the subject and applying a low pass spatial filter to the scatter images; estimating a second set of scatter images corresponding to projection images not included in the subset, based on the first set of scatter images; and subtracting, for each projection image, the corresponding scatter image to yield a corrected projection image. Applying the plurality of operations of the method in an iterative process on graphics-processor-quality computational hardware enables real-time scatter correction and reconstruction of CT volume images.

Target-specific dose and scatter estimation in CT images

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Solna, Sweden

Bjorn Nutti