1. An MRI method comprising: applying a preparatory radiofrequency (RF) pulse at a first time instant to a Magnetic Resonance (MR) scanner configured to scan an object comprising a plurality of chemical species; applying a phase sensitive pulse sequence in an RF coil in the MR scanner at a second time instant to the MR scanner, wherein the preparatory RF pulse and a time delay between the first and the second time instants null RF output signal corresponding to nuclear spins of a first subset of chemical species from the plurality of chemical species; receiving an RF output signal in an RF coil in the MR scanner corresponding to nuclear spins of a second subset of chemical species from the plurality of chemical species in response to the phase sensitive pulse sequence; estimating a static magnetic (B0) field map in a microprocessor based on the RF output signal corresponding to nuclear spins of the second subset of chemical species, wherein the static magnetic (B0) field map is not influenced by the presence of the first subset of chemical species: and generating graphical data for providing an user interface including the estimated static magnetic (B0) field map.