Method for obtaining a 3D image dataset of an object of interest
AssigneeSiemens Aktiengesellschaft
InventorsFrank Dennerlein, Oliver Hornung, Markus Kowarschik
Life of this patent
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Abstract
A method for obtaining a 3D image dataset of an object of interest is proposed. A plurality of 2D X-ray images are captured and a 3D reconstruction is carried out using filtered back projection. The projection parameters have been measured with the aid of a calibrating phantom, possibly using an interpolation or extrapolation of such measurements. A model of effect strings of the components in an X-ray imaging device is obtained, and the model parameters are identified based on imaging of a calibrating phantom. A projection matrix can then be calculated for any positions on any desired trajectories, without having to use imaging of a calibrating phantom at precisely that position and desired trajectory.
Claims6
A method for obtaining a 3D image dataset of an object of interest using an X-ray imaging device having a first effect string of components which are used to move an X-ray source and having a second effect string of components which are used to move an X-ray detector, comprising:
- obtaining a model having a plurality of model parameters for at least one of the first effect string and the second effect string;
- capturing 2D X-ray images of a calibrating object using the X-ray imaging device;
- identifying the plurality of model parameters based on the 2D X-ray images;
- defining a desired trajectory for at least one selected element of the X-ray source and the X-ray detector;
- adjusting the components of the effect string of the at least one selected element of the X-ray source and the X-ray detector to run through a sequence of positions according to the desired trajectory using an articulated arm robot;
- capturing 2D X-ray images of the object of interest at each position of the sequence of positions using the X-ray imaging device;
- defining a trajectory for an unselected element of the X-ray source and the X-ray detector;
- calculating imaging parameters for the each position of the sequence of positions based on the trajectories for the at least one selected and the unselected elements;
- and
- calculating the 3D image dataset using the calculated imaging parameters based on the 2D X-ray images captured at the each position of the sequence of positions.
Dependencies are inferred from the claim text.