1. A method for determining a mechanical property of anatomy, the method comprising: determining, by a processor, first anatomy locations of a valve of a patient derived from first medical scan data of the patient at a first time; determining, by the processor, second anatomy locations of the valve of the patient from second medical scan data of the patient at a second time different than the first time, the second anatomy locations being for a same anatomy of the valve as the first anatomy locations; deriving, by the processor, an actual displacement between the first anatomy locations and the second anatomy locations; modeling, by the processor, the valve with a biomechanical model, which is a function of the mechanical property and the actual displacement; determining, by the processor based on the biomechanical model, first modeled anatomy locations and second modeled anatomy locations; deriving, by the processor, a modeled displacement between the first modeled anatomy locations and the second modeled anatomy locations; and inversely solving, by the processor, for a value of the mechanical property of the valve as a function of the biomechanical model and a comparison of the actual displacement with the modeled displacement.