Computer-implemented method for providing a trained function set for determining a scattered radiation information item, computer-implemented method and evaluating facility for determining a scattered radiation information item, computer program, and electronically readable data carrier

A method for determining a scattered radiation information item defining a scattered radiation contribution in a two-dimensional X-ray image recorded with an X-ray facility, the method being computer-implemented and comprising:

• providing a trained function set using a method for providing a trained function set for determining a scattered radiation information item defining a scattered radiation contribution in an X-ray image that is two-dimensional and is recorded with an X-ray facility, the method for providing the trained function set being computer-implemented and comprising:
• providing a first evaluating function that is to be trained, that determines, from input data comprising the X-ray image, an average distribution dataset that defines an average scattered radiation distribution over a variation of at least one image recording parameter, as output data;
• providing a second evaluating function that is to be trained that determines, from input data comprising the at least one image recording parameter during recording of the X-ray image, transformation parameters of a transformation as output data so that the scattered radiation information item is determinable by applying the transformation to the average distribution dataset;
• providing a training dataset for each of a first number of basic scenarios for which only the at least one image recording parameter is changeable, wherein each training dataset for different values of the at least one image recording parameter comprises a second number of subdatasets, each comprising a training X-ray image as input data for the first evaluating function, a training value set of the at least one image recording parameter as input data for the second evaluating function and a training scattered radiation image comprising the scattered radiation distribution as a respective ground truth;
• separate training of the first evaluating function and the second evaluating function, making use of the training datasets;
• and
• providing the trained first evaluating function and the trained second evaluating function, wherein the function set comprises:
• a first trained evaluating function that determines, from input data comprising the X-ray image, an average distribution dataset that defines an average scattered radiation distribution over a variation of at least one image recording parameter, as output data;
• and
• a second trained evaluating function that determines, from input data comprising the at least one image recording parameter during recording of the X-ray image, transformation parameters of a transformation as output data so that the scattered radiation information item is determinable by applying the transformation to the average distribution dataset;
• providing the X-ray image to be evaluated and the at least one image recording parameter associated with the X-ray image;
• applying the first trained evaluating function to the X-ray image to be evaluated as input data for determining an average distribution dataset associated with the X-ray image to be evaluated, as output data;
• applying the second trained evaluating function to the at least one image recording parameter associated with the X-ray image to be evaluated, as input data for determining transformation parameters associated with the X-ray image to be evaluated, as output data;
• and
• determining the scattered radiation information item, the determining of the scattered radiation information item comprising applying the transformation according to the transformation parameters associated with the X-ray image to be evaluated, to the average distribution dataset associated with the X-ray image to be evaluated.

An evaluating facility for determining a scattered radiation information item defining a scattered radiation contribution in a two-dimensional X-ray image recorded with an X-ray facility, the evaluating facility comprising:

• a storage device in which a trained function set is stored, wherein the function set comprises:
• a first trained evaluating function that determines, from input data comprising the X-ray image, an average distribution dataset that defines an average scattered radiation distribution over a variation of at least one image recording parameter, as output data;
• a second trained evaluating function that determines, from input data comprising the at least one image recording parameter during recording of the X-ray image, transformation parameters of a transformation as output data so that the scattered radiation information item is determinable by applying the transformation to the average distribution dataset;
• an interface for receiving the X-ray image to be evaluated and the at least one image recording parameter associated with the X-ray image;
• a first applying unit for applying the first trained evaluating function to the X-ray image to be evaluated, as input data for determining an average distribution dataset associated with the X-ray image to be evaluated, as output data;
• a second applying unit for applying the second trained evaluating function to the at least one image recording parameter associated with the X-ray image to be evaluated, as input data for determining transformation parameters associated with the X-ray image to be evaluated, as output data;
• and
• a determining unit configured to determine the scattered radiation information item in the form of a scattered radiation image by application of the transformation according to the transformation parameters associated with the X-ray image to be evaluated, to the average distribution dataset associated with the X-ray image to be evaluated.

In a non-transitory computer-readable storage medium that stores instructions executable by one or more processors to provide a trained function set for determining a scattered radiation information item defining a scattered radiation contribution in an X-ray image that is two-dimensional and is recorded with an X-ray facility, the instructions comprising:

• providing a first evaluating function that is to be trained, that determines, from input data comprising the X-ray image, an average distribution dataset that defines an average scattered radiation distribution over a variation of at least one image recording parameter, as output data;
• providing a second evaluating function that is to be trained that determines, from input data comprising the at least one image recording parameter during recording of the X-ray image, transformation parameters of a transformation as output data so that the scattered radiation information item is determinable by applying the transformation to the average distribution dataset;
• providing a training dataset for each of a first number of basic scenarios for which only the at least one image recording parameter is changeable, wherein each training dataset for different values of the at least one image recording parameter comprises a second number of subdatasets, each comprising a training X-ray image as input data for the first evaluating function, a training value set of the at least one image recording parameter as input data for the second evaluating function and a training scattered radiation image comprising the scattered radiation distribution as a respective ground truth;
• separate training of the first evaluating function and the second evaluating function, making use of the training datasets;
• and
• providing the trained first evaluating function and the trained second evaluating function.