A method and apparatus for producing a digitally reconstructed 2 - d - image from a 3 - d - image data set.

摘要

The invention relates to a method for producing a digitally reconstructed 2 - d - image from a 3 - d - image data set by means of a ‘ ray - casting " - method. In this case, a in the 3 - d - image data set (1) being imaged object to be examined by means of virtual projection beams p_i (7) to a virtual image plane (b) is projected. The invention is characterised in that a maximum length l_{a maximum} is determined, which makes a virtual projection beam p_i for the penetration of the in the 3 - d - image data set is covered by imaged examination subject, and that for each virtual projection beam p_i, the to the penetration of the in the 3 - d - image data set imaged subject a length l_i l_{a maximum} in this way, an associated virtual projection value w_Pi on the basis of the in the projection beam direction in the 3 - d - image data set successively located 3 - d - image data of the object to be examined and a correction amount corr_Pi it is determined by the individual length difference δl_i = |l_{a maximum}| – |l_i| and a size c, wherein the size of c has a value of the in the order of magnitude of that 3 - d - image data values which is the object to be examined in the 3 - d - image data set representing.