1. A method for determining positron emission measurement information in the context of positron emission tomography, comprising: using a marker substance to carry out a positron emission measurement during a measurement time period, in a body area of a subject to be examined, to determine positron emission measurement information; scanning the body area to be examined during at least a part of the same measurement time period to obtain data sets with a time resolution suitable for determining at least one of perfusion and diffusion information; generating images based on the data sets obtained during the scanning using a second method; using the generated images from the second method to determine the at least one of perfusion and diffusion information for at least the part of the measurement time period; and evaluating the positron emission measurement information as a function of the at least one of perfusion and diffusion information.