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281 results about "Ultrasonic doppler" patented technology
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Device and method for vascular monitoring
InactiveUS7192400B2Easy to manufactureEasy to useBlood flow measurement devicesOrgan movement/changes detectionRadiologyUltrasonic doppler
A vascular coupler adapted to be fixed into position upon a blood vessel and there retain and position a matable sensing device. In a preferred embodiment, the vascular coupler is an anastomotic coupler and the sensing device comprises an ultrasonic Doppler probe.
Owner:SYNOVIS LIFE TECH
Seamless sensory system
InactiveUS6876945B2Digital computer detailsNavigation by speed/acceleration measurementsLocal environmentVelocity measurement
The Seamless Sensory System (3S), the invention, integrates state-of-the-art sensor technology with modern software engineering practices to create seamless positioning. The invention can include the incorporation of GPS / Inertial Navigation / IR and other technologies into a handheld / man wearable / mounted system that will not be compromised in hostile environments. The invention continues accurate navigation in the absence of GPS satellite signals. The invention utilizes a “continuous calibration” Kalman Filter methodology and motion sensor(s) to maintain “GPS-like” accuracy after GPS signals are no longer available. A proprietary technology called an Ultrasonic Doppler Velocity Measurement (UVM) Sensor is the invention's ‘key component’ to create “GPS like performance” under any GPS denied condition. Additional sensors are included to complete the picture of the local environment.
Owner:EMORD NICHOLAS JON
Multifrequency phased array ultrasonic Doppler flow detection system and method
InactiveCN101936756AReduce noiseHigh measurement accuracyVolume/mass flow measurementDisplay deviceBeam scanning
The invention discloses a multifrequency phased array ultrasonic Doppler flow detection system and a multifrequency phased array ultrasonic Doppler flow detection method. The system comprises a central control processor, a frequency synthesizer, a transmitting part, a receiving part and a display, wherein the transmitting part comprises a transmitter, a power distribution network, a beam control network, a first beam subarray and a second beam subarray; the receiving part comprises a first beam receiver, a second beam receiver, a multi-beam forming network and a signal processor. The system is characterized in that the central control processor is respectively connected with the frequency synthesizer, the transmitter, the power distribution network, the beam control network, the first beam receiver, the second beam receiver, the multi-beam forming network and the signal processor. In the detection method of the system, beam deflection and dynamic focusing are realized through the phased array technology, multi-directional and multi-depth positions can be measured on the cross section of an integral pipeline, and by a mode of adjusting beam scanning dynamically, the processing timeof the beam scanning is reduced, and the measuring accuracy is improved.
Owner:SOUTH CHINA UNIV OF TECH
Ultrasonic doppler sensor for speech-based user interface
InactiveUS20080071532A1Improve accuracyGood estimateAlarmsSpeech recognitionSonificationUltrasonic doppler
A method and system detect speech activity. An ultrasonic signal is directed at a face of a speaker over time. A Doppler signal of the ultrasonic signal is acquired after reflection by the face. Energy in the Doppler signal is measured over time. The energy over time is compared to a predetermined threshold to detect speech activity of the speaker in a concurrently acquired audio signal.
Owner:MITSUBISHI ELECTRIC RES LAB INC
Ultrasonic Doppler Sensor for Speaker Recognition
InactiveUS20100204991A1Improvement in speaker recognition accuracyImprove recognition accuracyCharacter and pattern recognitionSpeech recognitionSonificationUltrasonic doppler
A method and system recognizes an unknown speaker by directing an ultrasonic signal at a face of the unknown speaker. A Doppler signal of the ultrasonic signal is acquired after reflection by the face, and Doppler features are extracted from the reflected Doppler signal. The Doppler features are classified using Doppler models storing the Doppler features and identities of known speakers to recognize and identify the unknown speaker.
Owner:MITSUBISHI ELECTRIC RES LAB INC
Simulated corrosion test device and method for abyssal environment
InactiveCN103115862AWon't flow outImprove solubilityWeather/light/corrosion resistanceAutomatic controlEngineering
The invention relates to a simulated corrosion test device for an abyssal environment, belonging to the field of simulated test devices for the corrosion property of materials in the abyssal environment. The device comprises an autoclave, a refrigeration system, an air pump, a pressurizing system, a sample delivery device, an exhaust pipe, a dissolved oxygen sensor, an ultrasonic Doppler flowmeter, a pressure sensor, a temperature sensor, a salinity sensor, a pH meter, a drain pipe, a stirring motor, stirring blades and a control cabinet. The device has the advantages that the conditions of temperature, pressure intensity, seawater flow velocity, pH value, salinity and dissolved oxygen concentration of the abyssal environment can be simulated, the automation of control on environment conditions can be realized during a corrosion test, and a convenient indoor simulated test device for testing the corrosion property of the materials in the abyssal environment is provided.
Owner:JIANGSU UNIV
Arterial endothelial function measurement method and apparatus
ActiveUS20060264755A1High outputEasy to detectOrgan movement/changes detectionInfrasonic diagnosticsArteriolar VasoconstrictionArterial diameter
A “relaxoscope” (100) detects the degree of arterial endothelial function. Impairment of arterial endothelial function is an early event in atherosclerosis and correlates with the major risk factors for cardiovascular disease. An artery (115), such as the brachial artery (BA) is measured for diameter before and after several minutes of either vasoconstriction or vasorelaxafion. The change in arterial diameter is a measure of flow-mediated vasomodification (FMVM). The relaxoscope induces an artificial pulse (128) at a superficial radial artery (115) via a linear actuator (120). An ultrasonic Doppler stethoscope (130) detects this pulse 10-20 cm proximal to the point of pulse induction (125). The delay between pulse application and detection provides the pulse transit time (PTT). By measuring PTT before (160) and after arterial diameter change (170), FMVM may be measured based on the changes in PTT caused by changes in vessel caliber, smooth muscle tone and wall thickness.
Owner:RGT UNIV OF CALIFORNIA
Ultrasonic Doppler System and Method for Gesture Recognition
InactiveUS20100202656A1Character and pattern recognitionInput/output processes for data processingPattern recognitionSonification
A method and system recognizes an unknown gesture by directing an ultrasonic signal at an object making an unknown gestures. A set of Doppler signals are acquired of the ultrasonic signal after reflection by the object. Doppler features are extracted from the reflected Doppler signal, and the Doppler features are classified using a set of Doppler models storing the Doppler features and identities of known gestures to recognize and identify the unknown gesture, wherein there is one Doppler model for each known gesture.
Owner:MITSUBISHI ELECTRIC RES LAB INC
Method and Apparatus For Determining The Absolute Value Of Intracranial Pressure
InactiveUS20100331684A1Accurate comparisonImprove accuracyBlood flow measurement devicesInfrasonic diagnosticsAngle independentUltrasonic doppler
A method and apparatus for obtaining the absolute value of intracranial pressure in a non-invasive manner is described by using an ultrasonic Doppler measuring device which detects the intracranial and extracranial blood flow velocities of the intracranial and extracranial segments of the ophthalmic artery. The eye in which the blood flow is monitored is subjected to an external pressure, sufficient to equalize the intracranial and extracranial angle-independent blood flow factors calculated from the intracranial velocity signal and extracranial velocity signal. The absolute value of the intracranial pressure is identified as that external pressure at which such equalization occurs.
Owner:UAB VITTAMED
Gas-liquid two-phase flow metering device and method
InactiveCN105222831AEliminate measurement effectsHigh measurement accuracyMeasurement devicesDifferential pressureFriction loss
The invention provides a gas-liquid two-phase flow metering device, which mainly comprises a cyclone, a rectifier, an ultrasonic probe, an ultrasonic Doppler velocimeter, a Pitot tube, a differential pressure transducer, a pressure transducer, a temperature transducer, a data acquisition computer, and the like. A flow metering method provided by the invention comprises the steps of separating a gas-liquid two-phase flow in a tube by means of the cyclone to form an annular liquid film region and a central gas region, measuring the liquid flow in a liquid film by means of the ultrasonic Doppler velocimeter, and measuring the gas flow by means of the Pitot tube. Compared with a multiphase flowmeter in the prior art, the above gas-liquid two-phase flow metering device is small in size, compact in structure, small in resistance loss, wide in measurement range, and high in measurement precision.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Dual frequency doppler ultrasound probe
An ultrasonic Doppler probe is provided for use in connection with non-invasive Doppler imaging of fluid flow within the human body. The Doppler probe can be selectively operated at more than one frequency during the course of a Doppler imaging examination thereby enhancing the resolution of the image obtained while also increasing the effective depth of the image. The probe of the present invention employs piezo-electric materials for the formation of acoustic transmitting and receiving transducers that are positioned within the probe to allow the probe to be selectively operated at a number of different frequencies spanning no more than one octave in frequency range.
Owner:UNETIXS VASCULAR INC
Fetal heart sound monitoring instrument based on piezoelectric thin-film sensor
The invention discloses a fetal heart sound monitoring instrument comprising a piezoelectric thin-film sensor, a control circuit and a display component, wherein the control circuit and the piezoelectric thin-film sensor are electrically connected by a conducting wire. According to the fetal heart sound monitoring instrument, the mechanical vibration of the skin of the abdomen of a pregnant woman, which is caused by the palpitation movement of a fetus in the abdomen of the pregnant woman, is sensed by adopting the piezoelectric thin-film sensor and is also converted into a corresponding charge signal, the treatment of amplification, filtration, analog-to-digital conversion, separation and the like is carried out on the charge signal by the control circuit, and finally, a corresponding monitoring result is obtained by output. The fetal heart sound monitoring instrument disclosed by the invention has the advantages of signal monitoring sensitivity, accuracy and good linearity, easy production and manufacture and the like. The fetal heart sound monitoring instrument has more advantages that the fetal heart sound monitoring instrument disclosed by the invention is convenient to use and does not have any injuring action to a mother and a child, so that the fetal heart sound monitoring instrument can be used as a medical auxiliary instrument which is between a fetal heart stethoscope and an ultrasonic Doppler fetal heart sound detecting instrument and is used for clinical diagnosis and the self checking of the pregnant woman.
Owner:PEKING UNIV SHENZHEN GRADUATE SCHOOL
Ultrasound doppler diagnostic apparatus and image date generating method
InactiveUS20050080329A1Improve discontinuityDisplay clearVibration measurement in solidsAnalysing solids using sonic/ultrasonic/infrasonic wavesUltrasound dopplerDiagnostic equipment
An ultrasonic Doppler diagnostic equipment comprising a spectrum measurement unit which measures a Doppler spectrum, a decision unit which determines processing conditions of an average process on the basis of power values of spectral components in the Doppler spectrum, an average process unit which performs the average process of the Doppler spectrum on the basis of the processing conditions determined by the decision unit, and a display unit which displays a Doppler spectral image on the basis of the Doppler spectrum subjected to the average process by the average process unit. According to the configuration, the ultrasonic Doppler diagnostic equipment can improve discontinuities in those spectral components of small power values which are susceptible to interference noise, in the Doppler spectral image, and it can generate image data of high resolution.
Owner:TOSHIBA MEDICAL SYST CORP
Ultrasonic Doppler Diagnosis Device
InactiveUS20070282203A1High sensitivityIncrease speedUltrasonic/sonic/infrasonic diagnosticsInfrasonic diagnosticsSeparated stateUltrasonic doppler
There is provided an ultrasonic wave diagnosis instrument. The ultrasonic wave Doppler diagnosis instrument transmits an ultrasonic continuous wave in a range direction and receives a reflective wave of the ultrasonic continuous wave. The ultrasonic wave Doppler diagnosis instrument includes: a modulation unit that subjects the ultrasonic continuous wave to frequency modulation such that a phase is varied in accordance with the distance of the range direction; a demodulation unit that demodulates the reflective wave for each range of the range direction while interlocking with the frequency modulation, and generates a reception signal in the range in a separated state; and a presentation unit that presents information by using a signal of a Doppler component based on the reception signal.
Owner:TOSHIBA MEDICAL SYST CORP
Method and Apparatus for Continuously Monitoring Intracranial Pressure
ActiveUS20090287084A1Conversion factor is stableIncrease the lengthBlood flow measurement devicesInfrasonic diagnosticsUltrasonic dopplerNon invasive
A method and apparatus for continuously measuring the absolute intracranial pressure in a non-invasive manner is described by using an ultrasonic Doppler device which detects the pulsatility indexes of the blood flow inside the eye artery for both intracranial and extracranial eye artery portions. The eye in which the blood flow is monitored is subjected to a small pressure, sufficient to equalize the pulsatility index measurements of the internal and external portions of the eye artery. The pressure at which such equalization occurs is used as a reference for autocalibration of the apparatus so that continuous absolute intracranial pressure measurements may be taken over a particular sampling period.
Owner:UAB VITTAMED
Ultrasonic doppler measuring apparatus and control method therefor
InactiveUS20060084873A1Efficient and accurate generationBlood flow measurement devicesInfrasonic diagnosticsFrequency spectrumUltrasonic doppler
A Doppler sensitivity measuring unit measures the Doppler sensitivity of Doppler spectrum data obtained by ultrasonic wave transmission / reception with respect to a predetermined region of an object to be examined. A spectrum shape model generating unit generates a spectrum shape model on the basis of a window function used when the above Doppler spectrum data is generated. A threshold setting unit sets a threshold range in which trace waveform data displaces by a predetermined amount in the frequency axis direction on the basis of the spectrum shape model and the Doppler sensitivity, and sets a predetermined number of thresholds at almost equal intervals in the threshold range. A trace data generating unit selects a threshold for the acquisition of desired trace waveform data by generating trace waveform data while sequentially updating the plurality of set thresholds.
Owner:TOSHIBA MEDICAL SYST CORP
Colorful blood flow imaging based on ultrasonic Doppler frequency spectrum and display method thereof
ActiveCN104095656AEasy to measureImprove accuracyBlood flow measurement devicesFrequency spectrumUltrasound doppler
The invention discloses a colorful blood flow imaging based on an ultrasonic Doppler frequency spectrum and a display method thereof. The display method comprises the following steps: (1) selecting a sampling door which is large enough; (2) dividing the sampling door into M sub-doors; (3) calculating the frequency spectrum of a time series summed in every sub-door; (4) calculating the upper and lower envelope curves of the frequency spectrum corresponding to every sub-door, determining an effective frequency band analysis area, and calculating the average blood flow speed and a mean square error in the effective frequency band analysis area; and (5) converting speed and variance yields into colorful codes and displaying by using a preset color mapping table. According to the display method provided by the invention, a plurality of doors are utilized to obtain the flow velocity and variance distribution at different positions along the cross section of a blood vessel, therefore, the distribution of the blood flow in a spatial position can be observed better, the volume and blood flow velocity can be measured more precisely, and the colorful blood flow imaging has an important clinical meaning on the diagnosis of cardiovascular diseases.
Owner:SASET CHENGDU TECH LTD
Instant heart rate detection method and device for Doppler fetal heart sound based on time-frequency analysis
The invention relates to the technical field of medical monitoring, and discloses an instant heart rate detection method and device for Doppler fetal heart sound based on time-frequency analysis. The detection method comprises the following steps: preprocessing the Doppler fetal heart sound through a band-pass filter; performing time-sequence analysis on the preprocessed ultrasonic Doppler fetal heart sound, and acquiring a time-sequence graph of the ultrasonic Doppler fetal heart sound by adopting an STFT (Short Time Fourier Transform) to realize convenient and rapid calculation; acquiring the instant heart rate of the fetal heart sound with a cross-correlation method: selecting a feature frequency band according to the time-frequency graph of Doppler fetal heart sound, selecting a feature template according to prior knowledge of a fetal sound signal, evaluating a cross-correlation function of the feature frequency band and the feature template, drawing a cross-correlation curve, and calculating the instant heart rate of the ultrasonic Doppler fetal heart sound signal by calculating the interval of the crest value of the cross-correlation curve. The method can be applied to calculation of the instant heart rate of a clinically-acquired ultrasonic Doppler fetal heart sound signal, and has the advantages of easiness, high calculation speed and high accuracy.
Owner:GUANGDONG UNIV OF TECH
Ultrasonic open channel flow rate comprehensive monitoring instrument and measuring method thereof
InactiveCN101672647AModify working parameters at any timeDisplay working status in timeThermometers using electric/magnetic elementsVolume/mass flow measurementUnderwaterUltrasonic doppler
Owner:CHINA IRRIGATION & DRAINAGE DEV CENT +2
Array fetal heart monitoring abdominal bandage based on piezoelectric film sensor
ActiveCN103222863AQuick responseHigh sensitivityDiagnostic recording/measuringSensorsSensor arrayDigital signal processing
The invention provides an array fetal heart monitoring abdominal bandage based on a piezoelectric film sensor and relates to the field of monitoring on the heart of a fetus. The invention is used for solving the problems of serious error, 'invasion type' monitoring manner and low accuracy caused in the fact that a fetal heart sound stethoscope, an ultrasonic Doppler fetal heart sound instrument and a single sensor are used for fetal heart monitoring in the prior art. Magic pastes are respectively arranged at the two end parts of the abdominal bandage, and a piezoelectric film sensor array is arranged at the middle part of the abdominal bandage; a detection circuit is arranged on the abdominal bandage; and the detection circuit is composed of a preposed differential amplifying circuit, a filter circuit, an analog / digital conversion circuit, a DSP (digital signal processing) module, a storage module and an interface module. The adopted piezoelectric film sensor has the advantages of high response speed, high flexibility and good linearity, and high detection accuracy can be guaranteed; and the piezoelectric film sensor is light, soft and durable, so that the piezoelectric film sensor can be in fit with a human body well after being embedded into the abdominal bandage and a man-machine effect is good.
Owner:HARBIN INST OF TECH
Method and device for using ultrasound Doppler information to display bloodstream image
InactiveCN101214159AImprove clarityHigh sensitivityBlood flow measurement devicesSonificationUltrasonic doppler
The invention relates to an ultrasound diagnosis technique, in particular to a method and a device of displaying blood flow images by ultrasonic Doppler information. The invention is characterized in that: firstly, ultrasonic impulses are emitted to an interesting direction or an interesting region according to the predetermined repeated frequency, and echo signals returning from the direction or the region are received; secondly, a series of orthogonal composite Doppler difference frequency signals with the sampling volume are extracted from the echo signals; thirdly, the delayed autocorrelation strength of the orthogonal composite Doppler difference frequency signals is calculated; fourthly, the blood flow images are displayed according to the delayed autocorrelation strength. The blood flow images can also be clearly displayed through the ultrasonic Doppler information under the conditions that the signal-noise ratio is low and the transmission power is not increased.
Owner:FOURTH MILITARY MEDICAL UNIVERSITY
Multiphase flow measurement
Methods and systems are described that provide for measuring flow properties of multiphase mixtures within a pipe carrying gas-liquid hydrocarbons and water produced from oil-gas wells. The methods and systems may provide for a combination of a clamp-on ultrasonic gas flow meter to measure flow characteristics of a gas phase in a pipeline and a pulsed ultrasonic Doppler sensor(s) and / or an RF / microwave electromagnetic sensor(s) to measure flow characteristics of a liquid phase. The combination of sensors may provide for multiphase flow measurements under certain flow conditions, such as when the gas-liquid is flowing in a substantially horizontal pipeline, when the flow is stratified or is caused to be stratified and / or the like.
Owner:PRAD RES & DEV LTD
Underwater multipurpose robot propelled by bionic undulating fins
PendingCN111422334APropulsion mode quietImprove concealmentMeasurement devicesPropulsive elements of non-rotary typeClassical mechanicsUltrasonic doppler
The invention discloses an underwater multipurpose robot propelled by bionic undulating fins. The underwater multipurpose robot comprises a head, a middle, a tail, a left bionic undulating fin propelling mechanism and a right bionic undulating fin propelling mechanism which are arranged in sequence. The bionic undulating fin propelling mechanisms on the left side and the right side with a cam swing arm driving structure as the core are adopted for driving the fin strips to drive the flexible fin faces to generate continuous undulating deformation, the fin strips act with water to generate advancing thrust, through cooperation with a sinking and floating adjusting mechanism in the middle, multi-dimensional movement such as straight moving, turning and floating and diving of the underwater robot can be achieved, and good maneuverability is achieved. Meanwhile, the sensing flow field speed data and the self orientation data can be obtained according to an ultrasonic Doppler current meterarranged at the head part and a USBL underwater acoustic positioning system; motion of the underwater robot is planned, the underwater robot is selected to operate on a channel with constant flow velocity and small flow resistance, the underwater robot has the capacity of sensing and reducing underwater surge interference in advance, and the underwater robot has good reliability and robustness.
Owner:XI AN JIAOTONG UNIV
Two-phase flow phase-splitting flow velocity acoustic-electric bimodal measuring method
ActiveCN104965104ADisturbance generationEasy to measureAverage speed measurementFluid speed measurementPhase splittingUltrasonic doppler
The invention provides a two-phase flow phase-splitting flow velocity acoustic-electric bimodal measuring method. A used bimodal sensor comprises an electric sensor and an ultrasonic Doppler probe. The measuring method comprises: acquiring a signal and acquiring water phase volume fraction, oil phase volume fraction, and two-phase flow mixed density by using the electric sensor; determining the measuring space of the ultrasonic Doppler probe and computing the equivalent height of the measuring space; computing a difference between ultrasonic signal frequency acquired by a ultrasonic receiving probe and exciting ultrasonic signal frequency emitted from a ultrasonic emitting probe and computing average flow velocity in the measuring space; establishing a fluid flow velocity distribution relation of a position in a pipeline and a certain distance to the wall of the pipeline; establishing a relation between Doppler measurement flow velocity and boundary layer flow velocity in the measuring space; solving the boundary layer flow velocity; and computing total flow velocity and acquiring the water phase flow velocity and oil phase flow velocity. The two-phase flow phase-splitting flow velocity acoustic-electric bimodal measuring method may accurately acquire two-phase flow phase volume fraction by a noninvasive mode.
Owner:TIANJIN UNIV
Breast milk flow meter apparatus and method
InactiveUS20090054771A1Accurately measureOrgan movement/changes detectionVolume/mass flow measurementVolume UnitMedicine
An apparatus measures the quantity of milk consumed by an infant during a breast-feeding session. The apparatus includes a brassiere-like garment (30) with openings allowing the breasts to be exposed for nursing an infant. Lining (32) is attached to the inside of the brassiere. Ultra-sonic Doppler-Effect transmitter probes (44) and receiver probes (46) are annexed to the brassiere lining pointing at the direction of the respective nipple of the nursing person. A processor is provided for translating flow measurements by the probes (44, 46) into volume units.
Owner:MAMSENSE
Fetal heart monitoring device
InactiveCN102920484AEnsure physical and mental healthEliminate anxiety and tensionHeart/pulse rate measurement devicesInformation processingSonification
The invention provides a fetal heart monitoring device which comprises an ultrasonic probe, an information input module, an information processing module and an information display module, wherein the ultrasonic probe is used for probing fetal heart signals and enabling ultrasonic Doppler signals of fetal heart movement to be converted to audio frequency information to be outputted, the information processing module is used for calculating and processing user body information inputted through the information input module and fetal heart audio frequency information of a fetus-voice meter main body inputted through a communication unit to generate display information data, and the information display module is used for displaying display information generated by the information processing module. The display information comprises fetal heart position information obtained through calculation and processing of the information processing module according to a pregnancy cycle of a user. The fetal heart monitoring device can monitor the fetal hear rate of a fetus, can help a pregnant woman quickly and precisely find a fetal heart position in use, smoothly carries out fetal heart monitoring, and eliminates anxious and nervous moods of the pregnant woman.
Owner:ANDON HEALTH CO LTD +1
Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation
ActiveCN103845079AQuick calculationImprove accuracyHeart/pulse rate measurement devicesObstetricsLow-pass filter
The invention provides a Doppler fetal cardiac sound instantaneous heart rate detecting method based on blind separation. The detection method comprises the following steps that the Doppler fetal cardiac sound is subjected to denoising preprocessing through a low-pass filter; the processed ultrasonic Doppler fetal cardiac sound is subjected to time-frequency analysis, and the short-time Fourier transform is utilized for solving the time-frequency diagram of the ultrasonic Doppler fetal cardiac sound signals; several characteristic frequency bands are selected from the time-frequency diagram according to the priori knowledge of the periodic characteristic of the time-frequency diagram of the fetal cardiac sound signals, then, different selected frequency band signals are subjected to Fast ICA analysis, independent components are worked out, then, the independent component IC which is most matched with the fetal cardiac sound signals is determined, next, a self-correlation function of the most matched independent component IC is calculated, the peak value is detected, and finally, the fetal cardiac sound heart rate is calculated. The Doppler fetal cardiac sound instantaneous heart rate detecting method is used for calculating the instantaneous heart rate on the clinically collected ultrasonic Doppler fetal cardiac sound signals and has the advantages that the method is simple, the calculation speed is high, the flexibility is good, and the accuracy is high.
Owner:GUANGDONG UNIV OF TECH
Ultrasonic doppler flow-meter
InactiveUS6564649B1Improve accuracyIncreased durabilityVolume/mass flow measurementFluid speed measurementLongitudinal waveCarrier signal
An ultrasonic Doppler flow-meter comprises a substrate with a piezoelectricity, input- and output interdigital transducers formed on a first end surface of the substrate, and a signal analyzing unit connected between the input- and output interdigital transducers. A second end surface of the substrate is in contact with a liquid. The finger direction the output interdigital transducer is slanting to that of the input interdigital transducer. When an input electric signal with a carrier frequency f0 is applied to the input interdigital transducer, a leaky Lamb wave is excited in the substrate. The leaky Lamb wave is radiated into the liquid in the form of a longitudinal wave, which is reflected back by a material in the liquid. The reflected longitudinal wave is detected at the output interdigital transducer as a delayed electric signal with a Doppler frequency f. A moving speed of the material is sensed at the signal analyzing unit in terms of a frequency difference DELTAf between the carrier frequency f0 and the Doppler frequency f.
Owner:TODA KOHJI
Ultrasonic-Doppler-effect positioning puncturing device for vessel
ActiveCN103750866APrecisely control the puncture anglePrecise control of puncture depthUltrasonic/sonic/infrasonic diagnosticsSurgical needlesControl systemUltrasonic doppler
The invention relates to an ultrasonic-Doppler-effect positioning puncturing device for the vessel. The device comprises an ultrasonic probe, a main control system and a puncturing device. The puncturing device comprises a support, a needle tube, a puncturing needle, a first coder and a second coder. The support is installed on the ultrasonic probe, the front end of the needle tube is installed infront of the support in a rotatable mode, an arc-shaped groove is formed in the rear of the support, and a guide rod is arranged at the rear end of the needle tube and located in the arc-shaped groove. The first coder is installed on the side wall of the needle tube, the second coder is installed on the guide rod, and the ultrasonic probe, the first coder and the second coder are electrically connected with the main control system. Due to the fact that the first coder and the second coder are arranged, through linkage between the needle tube and the ultrasonic probe, needle insertion is guided according to a puncturing range, a puncturing thread, angle information and depth information, the puncturing angle and puncturing depth of the puncturing needle are accurately controlled, it is ensured that a needle head of the puncturing needle accurately reaches the vessel of a focus part, then puncturing work is finished in a one-off mode, and the ultrasonic-Doppler-effect positioning puncturing device is safer and more reliable.
Owner:SHANTOU INST OF UITRASONIC INSTR CO LTD
Ultrasonic doppler system for determining movement of artery walls
InactiveUS20060210130A1Organ movement/changes detectionHeart/pulse rate measurement devicesSonificationImaging processing
The invention relates to an ultrasonic viewing system, for displaying images of an artery using a curved array of transducer elements, comprising means for acquiring (51) of an ultrasonic image sequence and a Doppler color sequence of a segment of artery explored along its longitudinal axis and having walls moving in relation with the cardiac cycle; and comprising processing means for: estimating the velocity and motion amplitude (53, 54, 55) of the artery walls along Doppler color ultrasound scanning lines; estimating the motion amplitude (58) of the artery walls along lines perpendicular to the artery global axis; and further comprising: display means for displaying (60) curves of this last artery wall amplitude on a dedicated display on which the user may have interaction. The invention further relates to an image processing method having steps to be carried out using this system.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
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