1. A method to evaluate magnetic resonance signals comprising the steps of: generating first signals by interaction of detection coils in a magnetic resonance tomography apparatus with magnetic fields emanating from a defined region of a subject in the magnetic resonance tomography apparatus; supplying said first signals to a processor and, in said processor, automatically calculating weighting factors exclusively from said first signals by determining, from said first signals, a sub-region within said region that is best visible in a resulting magnetic resonance image, and calculating said weighting factors with respect to said sub-region; generating second signals with said coils by interaction of the detection coils with magnetic fields emanating from the region of the subject; supplying said second signals to said processor and, in said processor, automatically calculating weighted signals by weighting only said second signals with said weighting factors; and making said weighted signals available at an output of said processor.