System and method for the correction of temporal artifacts in tomographic images

Abstract

The invention relates to an imaging system for imaging an object (), said imaging system comprising a detection unit () for consecutively acquiring projection data sets (P) of the object (), said detection unit () having a temporal response function that is characterized by at least a time constant (τ), a rotation unit that, while the projection data sets (P) are being acquired, moves the detection unit () around the object () with an essentially constant angular velocity (ω), a reconstruction unit () for computing an image data set () of the object () from the projection data sets (P), and a filter unit () that, in an active state, applies a filter (f) on the image data set () to compute a correction, which filter acts as a derivative on the perturbed image, essentially in a direction corresponding to the direction of the angular velocity, is essentially proportional to the time constant (τ) and is essentially proportional to the angular velocity (ω), said filter unit () being arranged to subtract the correction from the image data set ().