Method and x-ray device to determine a three-dimensional target image data set

摘要

In a method and x-ray device to determine a three-dimensional target image data set showing at least one partial region of interest of an acquisition region, wherein the image data of the three-dimensional target image data set are reconstructed from two-dimensional projection images acquired from various projection directions, first projection images are acquired without a collimation of the radiation source from first projection directions and a three-dimensional overview image data set of the acquisition region is reconstructed from the first projection images. The partial region of interest is selected in the overview image data set. Second projection images are acquired, with collimation at the partial region, from second projection directions, the second projection directions differing from the first projection directions. The target image data set showing the acquisition region and the partial region of interest is reconstructed from all first and second projection images.

主权项

1. A method to determine a three-dimensional target image data set showing at least one partial region of interest of an acquisition region, comprising:
operating an x-ray image acquisition system, comprising a radiation source, to acquire first projection images without collimation of said radiation source, from first projection directions; in a processor, reconstructing a three-dimensional overview image data set of the acquisition region from said first projection images; selecting the partial region of interest in the overview image data set; operating said x-ray image acquisition system to acquire second projection images with collimation of said partial region, from second projection directions that all differ from said first projection directions, with none of said second projection directions being the same as any of said first projection directions; and in said processor, reconstructing said target image data set showing said acquisition region and said partial region of interest, from all of said first and second projection images, and making said target image data set available in electronic form at an output of the processor, as a data file.