1. A method for acquiring magnetic resonance image data for producing a magnetic resonance image therefrom, comprising the steps of: in a magnetic resonance image data acquisition sequence, acquiring magnetic resonance image data by scanning a k-space matrix in segments with at least two partial data acquisitons; in each of said partial data acquisitions, generating a navigation signal, in addition to a measurement signal with which a respective k-space segment is scanned, said navigator signal scanning a same multi-dimensional navigator segment of said k-space matrix in each of said partial acquisitions; for at least one of said partial acquisitions, automatically electronically determining a measure that characterizes a breadth of a distribution of signal values of the navigator signal with regard to said k-space matrix; and repeating said at least one of said partial acquisitions if said measure lies outside of a tolerance range, to ultimately acquire an image data set suitable for reconstructing a magnetic resonance image therefrom.