| 摘要 |
The invention relates to a helical cone beam computed tomography method wherein a radiation source moves along a helical trajectory with respect to an object in a nPi relative movement. Measured values are partially differentiated with respect to the angular position of the radiation source on the helical trajectory, and intermediate filter values are generated by filtering along filter lines with a kappa-filter. Each of the intermediate filter values is multiplied by a filter factor wherein the filter factor for intermediate filter values, which have been generated by filtering along filter lines running only within the Pi window, is larger than or equal to filter factors, by which intermediate filter values are multiplied, which have been generated by filtering along filter lines running within and outside the Pi window. Intermediate filter values generated for a measured value are added to a final filter value, and the final filter values are back projected to reconstruct an image of the object.
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