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AssigneeOtto-Von-Guericke-Universitaet Magdeburg
InventorsThomas Hoffmann, Tim Pfeiffer, Robert Frysch, André Mewes, Benjamin Fritsch, Georg Rose
Estimating the term…
The invention relates to a method for determining an X-ray image dataset of a target region of an object to be examined, wherein projection images showing the target region are captured by means of an X-ray detector and the X-ray image dataset is reconstructed from the projection images, wherein a first portion of the projection images is captured so as to be collimated onto the target region by the target region being irradiated with X-ray radiation by means of an X-ray device through at least one main radiation opening of a collimator assembly. The invention also relates to a corresponding apparatus for determining an X-ray image dataset of a target region of the object to be examined. The invention generally relates to the field of medical X-ray imaging, in particular with the aim of acquiring projections for reconstructing 2D computed-tomography images.
Method for determining an X-ray image data set of a target area of an examination object, wherein projection images showing the target area are taken by means of an X-ray detector and the X-ray image data set is reconstructed from the projection images, wherein a first part of the projection images are taken collimated onto the target area by the target area being irradiated with X-ray radiation by means of an X-ray device through at least one main radiation opening of a collimator assembly, characterized in that a second part of the projection images is taken in order to reduce truncation artefacts in the X-ray image data set by irradiating marginal regions of the target area with X-ray radiation through one or several secondary radiation openings of the collimator assembly, which surround the main radiation opening or are adjacent to it and the X-ray image data set is determined from the first part of the projection images with the aid of the second part of projection images.
Apparatus for determining an X-ray image data set of a target area of an examination object, having an X-ray detector for taking projection images showing the target area and a reconstruction means for reconstructing the X-ray image data set from the projection images, further having an X-ray device and a collimator assembly having at least one main radiation opening for taking a first part of the projection images, which are taken collimated onto the target area by the target area being irradiated with X-ray radiation by means of an X-ray device, characterized in that the collimator assembly has one or several secondary radiation openings, which surround the main radiation opening or are adjacent to it, wherein a second part of the projection images is taken by irradiating marginal regions of the target area with X-ray radiation through one or several secondary radiation openings, wherein the reconstruction means is arranged to determine the X-ray image data set from the first part of the projection images with the aid of the second part of the projection images to reduce truncation artefacts in the X-ray image data set.
Dependencies are inferred from the claim text.