APPARATUS FOR OBSERVING BLOOD FLOW PATTERNS

摘要

An apparatus for observing blood flow patterns by utilizing ultrasonic beams which includes at least a pulse generator, a transducer, first and second phase detectors, and a monitor. The ultrasonic beams are transmitted and received by the transducer to obtain echo signals reflected from the body. The echo signals are phase-detected by the first phase detector to derive pulsed Doppler signals. The pulsed Doppler signals are phase-detected by the second phase detector to derive phase difference signals between the sampled pulsed Doppler signals. The sampling periods are determined in accordance with a depth of the body along a travel path of the ultrasonic beams. The blood flow patterns of the blood cells of the body are displayed on the monitor by processing the phase difference signals.