1. A method of operating a magnetic resonance (MR) apparatus comprising an MR data acquisition unit with a plurality of radio-frequency (RF) reception coils, said method comprising: before acquiring MR data with said MR data acquisition unit, wherein MR data will be acquired individually by the respective plurality of RF reception coils and the acquired MR data will be entered into data points in a memory organized as k-space according to a random sampling scheme by which fewer than all available data points in k-space will be sampled, determining, in a processor, a set of sample points comprising all data points in k-space that will be sampled in order to acquire MR data when said random sampling scheme is utilized; in said processor, using said determined set of sample points in order to calculate a noise indicator value that mathematically represents a correlation of noise produced by respective contributions to said determined set of sample points by respective signals individually acquired by the respective reception coils; in said processor, determining an additional data point from among said data points in said memory that are potentially available for having an MR data entry entered therein, with said additional data point not being in said determined set of sample points; in said processor, calculating an amount of change of said noise indicator value that results by an addition of said additional data point into said determined set of sample points; in said processor, selectively adding or not adding said additional data point into said determined set of sample points dependent on the amount of change of said noise indicator value, in order to obtain an operational set of sample points; after obtaining said operational set of sample points, operating said MR data acquisition unit in order to acquire said MR data with said reception coils and in order to enter the acquired MR data into said memory at said operational set of sample points in k-space according to said random sampling scheme; and in said processor, reconstructing a set of reconstructed MR data from the MR data entered into k-space at said operational set of sample points, and providing the reconstructed MR data as an available data file at an output of said processor.