1. A method for physically-constrained imaging a heart, the method comprising: acquiring first and second medical diagnostic data representing a patient with a medical scanner; estimating, with a processor, first anatomy locations of a valve of the patient from the first medical diagnostic data of the patient at a first time; estimating, with the processor, second anatomy locations of the valve of the patient from the second medical diagnostic data of the patient at a second time different than the first time; altering the first anatomy locations for the first time as a function of the second anatomy locations and a biomechanical model relating physical mechanics of the valve from the first and second times; altering the second anatomy locations for the second time as a function of the first anatomy locations and the biomechanical model; and generating an image as a function of the altered first or second anatomy locations.