9 results about "Continuous wave doppler" patented technology

Method for providing reduced interference for at least two co-located FMCW (Frequency Modulated Continuous Wave) Doppler radars, each of said radars being used in a system to detect respective distances to and velocities of objects moving through space, can include a propagation determination step, in which expected electromagnetic wave propagation times are determined between pairs of radars; a sweep time offset synchronizing step, in which different respective sweep time offsets are selected, with respect to each radar in a first group of radars; and a sweep frequency offset synchronizing step, in which a second sweep frequency offset is selected with respect to a second group of radars, the second sweep frequency offset being relative to a sweep frequency pattern used for radars belonging to said first group. The invention also relates to a system and to a computer software product.

A handheld imaging device (100) for medical use comprising: a housing (106); and a sensor base (101) connected to the housing (106). The sensor base (101) comprises a first acoustic transducer array for imaging a sub-dermal structure in a first plane and a second transducer array for imaging the sub-dermal structure in a second plane. A processor (205), operable under control of electronic program instructions, activates transducer elements of the first transducer array (102) (e.g. operable in continuous wave Doppler ultrasound mode) and the second acoustic transducer array (103) (e.g. operable in A-mode ultrasound) to transmit signals and process receive signals reflected by the sub-dermal structure (104) to display an image of the sub-dermal structure (104), e.g. a vein. The processor (205) calculates characteristics of the sub-dermal structure (104) from the first and second imaged planes. The device (100) may be used in medical ultrasound to facilitate procedures such as cannulation and venepuncture.

An FMCW Doppler lidar system and method for use in a host vehicle includes a laser system, lenses, a homodyne receiver, and a signal processing unit (SPU). The laser beam is modulated to generate a frequency waveform with three segments, i.e., Doppler, up-ramp, and down-ramp. The lenses transmit laser beams toward a target-of-interest, and receive return beams reflected from the target-of-interest. The homodyne receiver has photoreceptors configured to mix the return beams with a respective local oscillator beam to generate a three-section return waveform. The SPU is coupled to the photoreceptors and calculates a respective magnitude and frequency of an up-ramp, down-ramp, and / or Doppler IF section of the return waveform, estimates a sign of the IF sections, and calculates a range and / or velocity relative to the target-of-interest using the estimated sign, and controls the host vehicle using the range and / or velocity.

The present invention discloses a method for quantitatively measuring the volume of atrioventricular valve regurgitation by M-mode PISA. Three target cardiac ultrasound images are received, the first image is the continuous wave Doppler spectral image of the atrioventricular valve regurgitation jet, the second image is the M-mode PISA color image, and the third image is the M-mode PISA grayscale image. The time curve of the PISA radius is obtained from the second and third images, and the value r of the PISA radius at each time point is calculated. (t) , the velocity-time curve of the regurgitation jet is obtained from the first image, and the velocity V at each time point is calculated. (t) , the aliasing velocity V is extracted from the metadata of the target cardiac ultrasound image. a , the instantaneous flow rate, total regurgitation volume, regurgitation orifice area at each time point, and average regurgitation orifice area are calculated. By automatically tracing the M-mode PISA contour and the continuous wave Doppler boundary of the regurgitation jet and calculating the total regurgitation volume, it can assist doctors in quickly and accurately quantifying the severity of atrioventricular valve regurgitation.

The invention relates to the technical field of ultrasonic imaging and chip design, and relates to a circuit system and a chip for realizing on-chip continuous wave Doppler ultrasound. According to the invention, the host receiver is directly connected with the host receiver and the internal transducer array element through the CW channel; the periphery of the array can multiplex an analog channel used for transmitting a receiving signal in the B mode; mUX switches are arranged in the array unit and on an array peripheral circuit; any transducer array element is controlled to be connected to a CW channel by controlling an MUX switch in the array unit; any CW channel is connected to an off-chip host interface through an MUX switch on the array peripheral circuit. On the premise of not increasing the number of extra cables and not increasing extra power consumption, a continuous wave Doppler ultrasound function is realized; the CW transmitting and receiving flexibility is guaranteed, the chip area is saved, cables needed by integration of the ultrasonic probe are reduced, and the CW transmitting and receiving device can be widely applied to various ultrasonic imaging systems and ultrasonic chips.

A system for determining peripheral artery disease and method of use for determining the presence or absence of peripheral vascular disease and the severity of the disease in particular vascular segments. The System for determining peripheral artery disease and method of use includes a continuous wave Doppler transceiver which generates a digitized version of quadrature detected stereo audio and is coupleable to a waveform converter and processor. The waveform converter and processor provides filtering, time domain to frequency domain conversion, gain control, and statistical processing of the converted Doppler Stereo audio and is operationally coupled to a display for presenting results to a technician.

The present invention provides a sleep movement recognition method, including its implementation on a sleep movement recognition system that cooperates with two continuous-wave Doppler radars. The method comprises: the sleep movement recognition system periodically receives and preprocesses I and Q channel signals sampled by the two radars when a person's sleep movements occur; based on the preprocessed I and Q channel signals, the sleep movement recognition system constructs spectrograms of the two radars and stacks them into a mixed spectrogram; the sleep movement recognition system inputs the mixed spectrogram into a pre-trained sleep movement recognition neural network model to perform sleep movement recognition and output a recognition result. The present invention overcomes the problem of low movement recognition accuracy caused by the small signal transmission angle of existing single-channel radar methods.

An ultrasonic continuous wave Doppler imaging method and device and storage medium, the position information of the CW sampling line is used to determine the transmitting aperture center position of the probe (40), the transmitting aperture center position of the probe (40) is used to determine the transmitting aperture, and the elements included in the transmitting aperture on the probe (40) are controlled to perform the transmission of the ultrasonic beam, the determined transmitting aperture is used to determine the receiving aperture, and the elements included in the receiving aperture on the probe (40) are controlled to perform the reception of the ultrasonic beam echo, so as to obtain the ultrasonic echo signal, the influence caused by the excessively large transmitting deflection angle can be reduced, and the ultrasonic imaging effect is relatively ideal.

An ultrasound system includes a transducer array configured to generate an analog ultrasound signal. The system includes one or more analog-to-digital converters (ADCs) in communication with the transducer array. The ADCs are configured to convert the analog ultrasound signal to a digital ultrasound signal. The system includes a processor circuit in communication with the ADCs. The processor circuit includes a digital in-phase / quadrature (I / Q) mixer configured to generate a digital continuous wave (CW) Doppler signal based on the digital ultrasound signal. The processor circuit is configured to process the digital CW Doppler signal, generate a graphical representation of a distribution of blood flow velocity over a plurality of cardiac cycles, and output the graphical representation to a display in communication with the processor circuit.