Method, image processing device and computed tomography system for determining a proportion of necrotic tissue as well as computer program product with program sections for determining a proportion of necrotic tissue

An image processing device to determine a necrotic proportion in a defined tissue area of an object under examination, the image processing device comprising:

• an image dataset interface, configured to read in a relatively high-energy image dataset including the tissue area of the object under examination and a relatively low-energy image dataset including the tissue area of the object under examination, each of the relatively high and low-energy image datasets being generated from x-ray measurements with relatively different x-ray energies after application of a contrast medium to the object under examination;
• a contrast medium image determination unit, configured to determine a virtual contrast medium image based on the relatively high-energy image dataset and the relatively low-energy image dataset;
• a segmentation unit, configured to segment the tissue area in a segmentation image dataset, created based upon at least one of the relatively high-energy image dataset and the relatively low-energy image dataset, and produce a segmentation result;
• a referencing unit, configured to transfer the segmentation result into the virtual contrast medium image for segmenting the tissue area in the virtual contrast medium image;
• and
• an analysis unit, configured to carry out an analysis of values of pixels belonging to the area to be segmented of the virtual contrast medium image in order to determine a necrotic proportion in a defined tissue area of an object under examination by identifying pixels to be assigned to necrotic tissue.