ULTRASONIC BLOOD FLOW SENSING APPARATUS

An ultrasonic Doppler blood flow sensing apparatus is disclosed which comprises a probe (17) for sending an ultrasonic wave into an living body and receiving echoes from the same, an ultrasonic diagnosing device (13) for processing the echoes received to provide a tomogram signal, an ultrasonic Doppler blood flow meter (14) for processing the echoes received to provide blood flow data, an electrocardiographic circuit (11) for detecting electrocardiographic data of the living body, a gate (12) for producing a sampling signal in response to an electrocardiographic signal from the electrocardiograph circuit (11), a random access memory (15) for sampling and storing blood flow data sensed by the blood flow meter (14) in response to the sampling signal from the gate (12), a detector (24) for detecting a radius r of a blood vessel on the basis of tomogram data derived from the diagnosing device (13), a detector (23) for detecting a cosine of 0, cos e, where 0 is an angle of direction of an ultrasonic beam with respect to a direction of blood flow at a part of the living body to be measured on the basis of the tomogram data derived from the diagnosing device (13), an arithmetic logic unit (18) for calculating an average blood flow during a most recent one minute of for one or several most recent cardiac cycles on the basis of the sampled blood flow data stored in the RAM (15), the detected cos Θ from the cosine detector (23) and the radius r of the blood vessel from the r detector (24), and a monitor (22) for displaying a tomogram defined by the tomogram data from the diagnosing device (13) and an average blood flow from the arithmetic logic unit (18).