Method and device for the reconstruction of three-dimensional images from cone beam projection data

摘要

The invention relates to a method of reconstructing three-dimensional images from cone beam projection data of an object to be examined which is arranged in an examination zone. In practice cone beam projections are usually cut off, because the object to be examined usually cannot be imaged completely in all imaging positions. An image which is reconstructed exclusively from the acquired projection data, therefore, does not have the highest possible image quality. In order to continue the projection data beyond the sensitive detector surface and hence obtain images of higher image quality, therefore, the invention proposes a method which includes the following steps:;(a) acquiring the cone beam projection data,;(b) determining the contour of the sensitive detector surface,;(c) determining pseudo-projection data in an overall outer zone from the projection data acquired, and;(d) reconstructing a three-dimensional image from the projection data and the pseudo-projection data.