Abstract: A method for providing a trained function set for determining a scattered radiation information item includes providing a first evaluating function that determines, from input data including an X-ray image, an average distribution dataset that defines an average scattered radiation distribution over a variation of an image recording parameter, as output data. A second evaluating function that determines, from input data including the image recording parameter during recording of the X-ray image, transformation parameters of a transformation as output data is provided, so that the scattered radiation information item is determinable by applying the transformation to the average distribution dataset. A training dataset is provided for each of a first number of basic scenarios for which only the image recording parameter is changeable. The method includes separate training of the evaluating functions, making use of the training datasets, and providing the trained first and second evaluating function.

Abstract: A method is provided for reducing artifacts occurring due to vessel overlaps in a four-dimensional angiography dataset acquired with administration of a contrast agent, wherein distribution data relating to a concentration of the contrast agent in the blood circulatory system is generated at the respective time points for a three-dimensional vessel dataset of a blood circulatory system or for a reduced dataset derived therefrom, e.g., by a trained function. A color intensity of a pixel showing a contrast agent filling state contained in a respective projection image of the blood circulatory system is distributed according to the distribution data at the respective time point of the acquired projection image across voxels of the vessel dataset that lie along a ray associated with the pixel in the backprojection.

Abstract: A method is provided for reducing artifacts occurring due to vessel overlaps in a four-dimensional angiography dataset acquired with administration of a contrast agent, wherein distribution data relating to a concentration of the contrast agent in the blood circulatory system is generated at the respective time points for a three-dimensional vessel dataset of a blood circulatory system or for a reduced dataset derived therefrom, e.g., by a trained function. A color intensity of a pixel showing a contrast agent filling state contained in a respective projection image of the blood circulatory system is distributed according to the distribution data at the respective time point of the acquired projection image across voxels of the vessel dataset that lie along a ray associated with the pixel in the backprojection.