A technique used in ultrasound imaging to monitor the behavior of a moving structure such as flowing blood or a beating heart. The frequency of ultrasonic waves reflected from a moving surface is slightly different from that of the incident waves. The detected frequency shift yields information about the moving structure. Fetal heart detectors work on this principle.
In the realm of medical diagnostics, there exists a technique that involves the utilization of ultrasound imagery to observe the dynamic motion of structures such as the pulsating rhythm of the heart or the flow of blood within the body. This procedure allows healthcare professionals to closely monitor these moving phenomena and gain valuable insights into their functionality.