The present invention provides a rheology system (202) comprising a rheology transducer device (204) for introducing mechanical waves into a subject of interest (120), whereby the rheology transducer device (204) comprises multiple transducers (212), a driving device (206) for driving the rheology transducer device (204), a sensor device (208) for sensing mechanical waves at the subject of interest (120), and a control device (210) for receiving input from the sensor device (208) and for controlling the driving device (206) based on the received input from the sensor device (208). The present invention further provides a MR rheology system (200) comprising a MR imaging system (110), and the above rheology system (202), whereby the MR imaging system (110) is adapted to control the rheology system (200). Still further, the present invention provides a rheology method comprising the steps of providing a rheology system (202) with its rheology transducer device (204) and its sensor device (208) in contact to a subject of interest (120), driving the rheology transducer device (204) to introduce mechanical waves into the subject of interest (120), sensing mechanical waves at the subject of interest (120) using the sensor device (208), and performing feedback control for driving the rheology transducer device (204) based on the mechanical waves sensed using the sensor device (208). The invention also provides MR rheology method based on the above rheology method with and without real-time feedback control.
