Koninklijke Philips Corporation N.V.

Colas Schretter

Matthias Bertram

Thomas Koehler

Peter Forthmann

Udo Van Stevendaal

Christoph Neukirchen

Steffen Wiesner

A method and apparatus are provided to improve large field of view CT image acquisition by using at least two scanning procedures: (i) one with the radiation source and detector centered and (ii) one in an offset configuration. The imaging data obtained from both of the scanning procedures is used in the reconstruction of the image. In addition, a method and apparatus are provided for detecting motion in a reconstructed image by generating a motion map that is indicative of the regions of the reconstructed image that are affected by motion artifacts. Optionally, the motion map may be used for motion estimation and/or motion compensation to prevent or diminish motion artifacts in the resulting reconstructed image. An optional method for generating a refined motion map is also provided.

Method and apparatus for large field of view imaging and detection and compensation of motion artifacts

A method and apparatus are provided to improve CT image acquisition using a displaced acquisition geometry. A CT apparatus may be used having a source () and a detector () transversely displaced from a center () of a field of view () during acquisition of the projection data. The amount of transverse displacement may be determined based on the size of the object (). The source and the detector may be adjusted to vary the size of the transverse field of view. The first data set acquired by the detector may be reconstructed and used to simulate missing projection data that could not be acquired by the detector at each projection angle. The measured projection data and the simulated projection data may be used to obtain a second data set. The second data set may be compared to the first data set to produce a corrected data set.

Method and apparatus to improve CT image acquisition using a displaced geometry

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Grez Doiceau, Belgium

Colas Schretter