A method of ultrasonic imaging includes displaying a first ultrasonic image, receiving an operator's input defining a region of interest, creating a first time intensity curve for the region of interest in the first ultrasonic image, displaying the first time intensity curve on a display device with the first ultrasonic image, and storing information on a position of the region of interest in a non-transitory storage medium. The method includes displaying a second ultrasonic image, reading information on the position from the non-transitory storage medium, creating a second time intensity curve for the region of interest in the second ultrasonic image； and displaying the second time intensity curve on the display device with the second ultrasonic image.
