Abstract: An ultrasonic Doppler diagnostic apparatus which transmits an ultrasonic wave into a subject under observation, detects the velocity of movement of a moving reflective member such as blood flow within the heart or a coronary artery of the subject, and displays the detected velocity information as an image. The apparatus transmits an ultrasonic pulsed wave into a subject, receives the echo reflected from the subject, converts the clutter signal contained in the received signal into a complex clutter signal in a complex signal converter, and uses this complex clutter signal as a complex reference signal for mixing with the received signal to produce a complex signal.When the complex clutter signal is used as a complex reference signal in this way, it is possible to obtain a complex signal free of the velocity information related to slow moving members such as the blood vessel wall and the heart wall which is contained in the received signal.

Abstract: A Doppler ultrasonic diagnostic apparatus for measuring or displaying the velocity information of moving members within an organism by transmitting and receiving ultrasonic waves is used for ultrasonic diagnosis in the medical field and the like.The apparatus is composed of a transmission circuitry for producing two ultrasonic waves having different repetition periods and outputting an ultrasonic wave after change-over between them; a velocity calculating means for calculating the velocities of moving reflective members on the basis of the received Doppler signals from the two ultrasonic waves, for example, a velocity calculator or an autocorrelator for obtaining the autocorrelation of a received signal after converting it to a complex signal; a memory for storing the velocity information signals obtained by the velocity calculating means; and other calculating means.

Abstract: A Doppler signal frequency converter for use in an apparatus used to detect and measure the velocity of movement of an object by picking up the reflections of ultrasonic waves beamed at the subject of examination. The converter is provided with one or a plurality of complex signal converters, and a complex multiplier which computes the conjugate and complex products of the complex signals. The complex signal converter converts the Doppler signals to a plurality--for example two--complex signals which differ in frequency. By carrying out computations based on the real and imaginary parts of the complex signals, the conjugate and complex products of the two complex signals are obtained.

Abstract: An ultrasonic device for measuring the acceleration of a moving reflective member that is useful in ultrasonic image diagnosis. The device transmits an ultrasonic wave into a living organism and upon receiving the wave reflected by a moving reflective member in the organism, calculates and visually displays the acceleration of the moving reflective member.The device consists of a complex signal converter for transmitting a periodic pulse modulated wave into a living organism, receiving a reflected signal from a moving reflective member in the living organism and converting the received signal into a complex signal, and an acceleration measurement means having a plurality of complex delay lines with delay equal to an integral multiple of the pulse period, said acceleration measurement means calculating the acceleration of the moving reflective member from the signals output by the complex signal converter and the signals output by the complex delay lines.

Abstract: The present invention provides an ultrasonic blood flow imaging forming apparatus in which ultrasonic beams are transmitted into and reflected by a living body to color-display the distribution of velocity in a moving member and the properties of the living body's tissue on a CRT screen in the two-dimensional manner.The ultrasonic blood flow imaging apparatus includes a color processing section for forming an image in accordance with vector signals, the color processing section including a color processor responsive to vector angles in the vector signals to change the hue, and a brightness processor responsive to amplitude of the vector signals to change the brightness of the hue. The apparatus also includes a complementary color mixing processor responsive to the third data of the living body obtained from the ultrasonic received signals to mix the hue which is outputted from the color processor with its complementary color.

Abstract: An ultrasonic transmitter/receiver for moving member measurement wherein an ultrasonic pulse beam is transmitted into and received from a subject under examination at a fixed pulse-repetition frequency, the signal received during each transmission/reception cycle is compared with the signal received during the previous transmission/reception cycle to obtain a comparison signal and the movement of a moving member in the subject is detected and measured on the basis of the comparison signal.

Abstract: An ultrasonic Doppler diagnostic apparatus usable for ultrasonic image diagnostics accurately determines and displays the velocity of moving reflective members within a subject under observation by transmitting an ultrasonic beam into the subject and receiving the echoes reflected by the moving reflective members. The apparatus comprises a memory for storing a first velocity distribution obtained from a first signal received from a given direction, and a tangential velocity calculator for calculating a tangential velocity distribution in a direction tangential to an arc of a scanned sector by comparing said first velocity distribution within a second velocity distribution obtained from a second signal received from a direction deflected by a small angle with respect to the direction of the first signal.

Abstract: An ultrasonic diagnostic device for measuring the velocity of blood flow within a living body comprises a transmitter for transmitting an ultrasonic wave into the body, a receiver for amplifying the part of the ultrasonic wave reflected from the body, converting it into an electric signal and amplifying the signal in accordance with a logarithmic amplification characteristic, a converter circuit which receives the amplified signal from the receiver and a reference signal from the transmitter and outputs a signal corresponding to the ratio of the component of the reflected ultrasonic wave attributable to the blood flow and the component thereof attributable to the wall of the blood vessel through which the blood flows, an extraction circuit which receives the amplified signal from the receiver and outputs a signal corresponding to the component attributable to the wall of the blood vessel, and an arithmetic circuit which multiplies the signals output by the converter circuit and the extraction circuit, whereby

Abstract: An ultrasonic diagnostic device for measuring the velocity of blood flow within a living body comprises a receiver for amplifying a received wave in accordance with a logarithmic amplification characteristic and at least one inverse logarithmic converter which produces an output having an inverse logarithmic characteristic with respect to the input thereto. As a result, the device can carry out high-precision measurement of blood flow even when the component of the received wave corresponding to the blood flow is much smaller than a component of the received wave corresponding to the wall of the blood vessel or heart through which the blood is flowing.

Abstract: An ultrasonic diagnostic device capable of the accurate real-time measurement and display of the amount of deviation in the velocity distribution of moving objects within a living organism.