Koninklijke Philips Corporation N.V.

Steffen Wiesner

Matthias Bertram

Thomas Koehler

Peter Forthmann

Jens Wiegert

Udo Van Stevendaal

Colas Schretter

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

A method includes generating a plurality of scatter distributions based on geometric models having different object to detector distances, determining an imaged object to detector distance, and identifying a scatter distribution of the plurality of scatter distributions having a object to detector distance that corresponds to the imaged object to detector distance. The method also includes employing the identified scatter distribution to scatter correct projection data corresponding to the imaged object. Another method includes generating an estimate of wedge scatter by propagating a predetermined wedge scatter profile through an intermediate reconstruction of an object; and employing the estimate to wedge scatter correct the projection data.

Method and system for error compensation

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Cologne, Germany

Steffen Wiesner