1. A perfusion assessment system comprising: a device configured to: provide an echo-power signal indicative of a perfusion of a contrast agent in a body part under analysis, the contrast agent being administered as a bolus and undergoing a significant destruction during a passage of the contrast agent in the body part, and a processor configured to: associate the echo-power signal to a model function including a mathematical product between a bolus function indicative of the passage of the contrast agent without said destruction and a reperfusion function indicative of a reperfusion of the contrast agent in the body part following the destruction corresponding to a substantially constant inflow of the contrast agent, and estimate at least one perfusion indicator from the model function, the bolus function, or the reperfusion function.