The invention provides for a medical instrument (200, 400, 500) comprising a magnetic resonance imaging system (202), a transducer (222) for mechanically vibrating at least a portion of the subject within the imaging zone. Instructions cause a processor (236) controlling the medical instrument to: control (100) the transducer to vibrate control (102) the magnetic resonance imaging system to repeatedly acquire the magnetic resonance data (252) using a first spatially encoding pulse sequence (250) control (104) the magnetic resonance imaging system to acquire navigator data (256) using a second spatially encoding pulse sequence (254) construct (106) a set of navigator profiles (258, 804, 904, 1004, 1108, 1208, 1308) using the navigator data determine (108) at least one parameter (260) descriptive of transducer vibrations using the set of navigator profiles and reconstruct (110) at least one magnetic resonance rheology image (262) from the magnetic resonance data.
