Method and apparatus for testing algorithms or systems for processing, evaluating or reconstructing x-ray-based images

An apparatus configured to test algorithms or systems for processing, evaluating or reconstructing X-ray-based images, the apparatus comprising:

• a data interface configured to receive at least one working image, the at least one working image including a CT image;
• a simulation unit configured to generate a number of simulation images from the at least one working image, wherein for each image point of the simulation images, image values of the at least one working image are summed along a respective line;
• and
• a data interface configured to output the simulation images.