1. A method for determining acoustic resonances in a magnetic resonance apparatus, comprising the steps of: (a) implementing a resonance measurement in a magnetic resonance tomography apparatus by applying a plurality of alternating gradient pulses having a fixed time spacing relative to each other, applying an excitation pulse, and obtaining at least one magnetic resonance signal; (b) evaluating said magnetic resonance signal to obtain a value of at least one parameter characterizing acoustic resonance of said magnetic resonance tomography apparatus; (c) repeating steps (a) and (b) multiple times and varying said time spacing from repetition-to-repetition; (d) forming a resonance curve from the respective values of said characteristic parameter in said multiple repetitions as a function of the varied time spacing; and (e) determining a resonance of said magnetic resonance tomography apparatus from said resonance curve.