Patent ID: 6618468
Filing Date: 2003-09-09
Classification: G06T

Abstract:
A method of reconstructing images from cone beam projection data of an examination zone of an object to be examined, the cone beam projection data being acquired by means of an X-ray device which includes an X-ray source and an X-ray image intensifier, said X-ray source being guided along a trajectory around the examination zone in order to acquire the projection data, which method includes the steps of:acquiring first projection data from the examination zone in a first mode of operation of the X-ray image intensifier with a low resolution, acquiring second projection data from a sub-zone of the examination zone in a second mode of operation of the X-ray image intensifier with a high resolution, combining the first and second projection data so as to form third projection data, the third projection data representing the second projection data in the sub-zone of the examination zone and the first projection data in the remaining part of the examination zone, and reconstructing images on the basis of the third projection data.