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531 results about "Echo time" patented technology
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Marker device for X-ray, ultrasound and MR imaging
InactiveUS20060293581A1Sharp contrastEasily introduced into tissueUltrasonic/sonic/infrasonic diagnosticsPowder deliveryDiagnostic Radiology ModalityMicrosphere
An imaging marker comprised of glass and iron-containing aluminum microspheres in a gel matrix which shows uniformly good contrast with MR, US and X-Ray imaging. The marker is small and can be easily introduced into tissue through a 12-gauge biopsy needle. The concentration of glass microspheres and the size dictate the contrast for US imaging. The contrast seen in MRI resulting from susceptibility losses is dictated by the number of iron-containing aluminum microspheres; while the artifact of the marker also depends on its shape, orientation and echo time. By optimizing the size, iron concentration and gel binding, an implantable tissue marker is created which is clearly visible with all three imaging modalities.
Owner:SUNNYBROOK & WOMENS COLLEGE HEALTH SCI CENT
Partial echo compressed sensing-based quick magnetic resonance imaging method
InactiveCN101975935AReduce acquisition timeReduce echo timeMagnetic measurementsLow speedData acquisition
The invention discloses a partial echo compressed sensing-based quick magnetic resonance imaging (MRI) method. The conventional imaging method has low speed and high hardware cost. The method comprises the following steps of: acquiring echo data of a random variable density part, namely intensively acquiring data in a central area of a k-space and acquiring the data around the k-space randomly and sparsely to generate a two-dimensional random mask, adding the two-dimensional random mask into every data point which needs to be acquired on a frequency coding shaft to form a three-dimensional random mask, and acquiring the data of the k-space according to the generated three-dimensional random mask; re-establishing by projection onto convex sets based on a wavelet domain which is de-noised by soft thresholding; and nonlinearly re-establishing a minimum L1 normal number based on finite difference transformation, namely sparsely transforming an image space signal x, determining an optimization objective and solving the optimization objective. By the method of the invention, partial echo technology and compressed sensing technology are combined and applied to data acquisition of MRI, sothat echo time is shortened, and data acquisition time is shortened at the same time.
Owner:HANGZHOU DIANZI UNIV
Spectral resolution enhancement of magnetic resonance spectroscopic imaging
InactiveUS20100085050A1Spectral broadeningMeasurements using NMR imaging systemsElectric/magnetic detectionTime domainMagnetic resonance spectroscopic
A method and apparatus for enhancing the spectral resolution of magnetic resonance spectroscopic (MRS) measurements include receiving time domain echo data from an MRS measurement for an MRS volume in a subject. Also received are high spatial resolution complex signal values within the MRS volume based on magnetic resonance imaging (MRI) measurements. Frequency-domain content is determined for the echo data based at least in part on the complex signal values. For example, in some embodiments, receiving complex signal values includes receiving high spatial resolution complex signal values within the MRS volume for each of two different echo time settings. The frequency-domain content of the echo data is corrected for a lineshape profile based on high resolution frequency dispersion values for the MRS volume determined from differences in the complex signal values for the two different echo time settings.
Owner:THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
Echo elimination device, communication terminal and method for confirming echo delay time
ActiveCN101321201AAccurate Echo CancellationAvoid errorsAnti-side-tone circuitsRadio/inductive link selection arrangementsTime delaysComputer science
The invention discloses an echo eliminating device, comprising: an acoustic echo eliminator which receives an echo time-delay value and determine parameters according to the echo time-delay value to eliminate the echo; a downlink voice detecting module which detects whether energy of a received downlink voice signal reaches the prearranged threshold value, if so, an identifier is output; a time-delay computing module which collects the uplink, downlink voice signals, computes correlative coefficient of the uplink, downlink voice signals at the time of receiving the identifier, determines the echo time-delay value corresponding to the maximum value of the correlative coefficient, and sends the echo time-delay value to the acoustic echo eliminator. The invention not only can configure appropriate parameters for terminal by the time of leaving factory, but also can be integrated to update relevant parameters in real time for a part of the acoustic echo eliminator, thereby the invention is apt for variation of the echo time-delay owing to change of the terminal's circumstance and improves effect of echo elimination as well as reduces expenditure of system resource. Meanwhile, the invention also discloses a communication terminal including the echo eliminating device, and a method for determining the echo time-dealy.
Owner:LEADCORE TECH
Magnetic resonance imaging of different chemical species in a system having magnetic field heterogeneities
ActiveUS20050085713A1Good estimateImprove Noise PerformanceDiagnostic recording/measuringMeasurements using NMR imaging systemsShort echo timeSource image
A multi-point chemical species (e.g., water, fat) separation process which is compatible with rapid gradient echo imaging such as SSFP uses an iterative least squares method that decomposes water and fat images from source images acquired at short echo time increments. The single coil algorithm extends to multi-coil reconstruction with minimal additional complexity.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
Method for accurately measuring shale porosity by adopting low-field nuclear magnetic resonance
InactiveCN104075974ATest accurateQuick testAnalysis using nuclear magnetic resonancePermeability/surface area analysisSolid-state nuclear magnetic resonancePorosity
The invention discloses a method for accurately measuring shale porosity by adopting the low-field nuclear magnetic resonance. The method comprises the following steps: as for a saturated water column-shaped shale sample, conducting nuclear magnetic porosity measurement in different echo time and waiting time; conducting helium porosity measurement; comprehensively comparing and analyzing the porosity results of the two methods; optimizing the optimal echo time and waiting time for testing to facilitate the accurate testing of follow-up samples. The method solves the problems of how to set reasonable parameters to measure the shale porosity by adopting the low-field nuclear magnetic resonance, and solves the problem that in the actual testing, the nuclear magnetic porosity obtained in different echo time and waiting time is in great disparity, and the comparability of the nuclear magnetic porosity and the helium porosity is relatively poor; compared with the prior art, by adopting the method, the shale porosity can be quickly and nondestructively measured, the accuracy and precision of the shale porosity measurement can be improved, and the operation is convenient.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
DIXON water-fat separation method in magnetic resonance imaging
ActiveCN103513202AIncrease flexibilityReduce restrictionsMagnetic measurementsPhase differenceFourier transform on finite groups
The invention discloses a DIXON water-fat separation method in magnetic resonance imaging. The method comprises the following steps: a) in the magnetic resonance scanning process, three different echo signals including the first echo signal S1, the second echo signal S2 and the third echo signal S3 are acquired, wherein the water-fat signal procession phase difference of the first echo signal S1 and the third echo signal S3 is 2npi, and n is a natural number; b) the acquired k space signals are converted into image signals through Fourier transform; c) effective image signal pixels are extracted in a image domain, the phase diagram of the effective image signal pixel composite signal is extracted, and phase unwrapping is performed on the phase diagram to obtain a static magnetic field distribution diagram delta B0; d) and the water image and the fat image in the echo signals are separated by utilizing the static magnetic field distribution diagram delta B0. According to the DIXON water-fat separation method provided in the invention, the echo time can be set flexibly according to a magnetic resonance imaging sequence and application requirements, so not only data can be processed by applying the conventional DIXON algorithm, and but also the limitation on imaging sequence parameter setting can be reduced at the same time.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Method to generate magnetic resonance exposures
ActiveUS20130033262A1Fast wayImprove signal-to-noise ratioDiagnostic recording/measuringSensorsDiffusionData set
In a method described for generating magnetic resonance exposures in which diffusion-coded raw data are acquired with of a diffusion gradient measurement sequence having a number of partial diffusion gradient sequences, at least one diffusion coding gradient pulse is emitted in each partial data set, and raw data of a k-space region are acquired during a first echo after a defined first echo time the k-space regions in total covering a complete k-space. Raw data of an established navigator k-space region are acquired during a second echo after a second echo time the navigator k-space region being identical for different partial diffusion gradient sequences. Reference raw data are acquired by a reference measurement sequence with multiple partial reference sequences.
Owner:SIEMENS HEALTHCARE GMBH
Method and device for tracking echo time delay
ActiveCN105472191AEliminate jitterImprove long-term stabilityTwo-way loud-speaking telephone systemsTelephone set constructionsTime delaysPeak value
The invention provides a method and a device for tracking echo time delay. The method comprises steps that, an echo reference signal and a sound input signal are acquired, and echo time delay of the echo reference signal at a present frame is determined by utilizing peak values of cross-correlation functions of the echo reference signal and the sound input signal at the present frame. According to the method and the device, in the process of acquiring the echo reference signal, the echo time delay of the echo reference signal at the present frame is determined by utilizing the peak values of the cross-correlation functions of the echo reference signal and the sound input signal at the present frame, so echo time delay of the echo reference signal at each frame is tracked, and bases are provided for eliminating time delay jittering and improving long-term stability of the echo elimination performance.
Owner:BAIDU ONLINE NETWORK TECH (BEIJIBG) CO LTD
Determining height of a liquid level interface in a container from acoustic signal or echo time measurement
An ultrasonic liquid level detector includes clamp-on transducers for a liquid level measurement by the clamp-on transducers instead of insertion type transducers. The ultrasonic liquid level detector measures a height of a liquid-liquid interface or a gas-liquid interface based on an acoustic attenuation of an acoustic pulse or a transit-time of the acoustic pulse using a pulse echo technique or a combination thereof.
Owner:SIEMENS AG +1
Multi-channel laser echo time measurement system based on FPGA (Field Programmable Gate Array) chip
InactiveCN103698770AReduce resource usageNo subsequent calibration requiredElectromagnetic wave reradiationMeasurment by measuring phaseVoltage referenceWeak current
The invention discloses a multi-channel laser echo time measurement system based on an FPGA (Field Programmable Gate Array) chip, and relates to the field of photoelectric measurement. The system solves the problems that the existing single-point detector cannot meet requirements of multiple channels, high accuracy, wide measurement range, rapid measurement and the like. The system comprises an array detector used for converting a received laser echo signal into a weak current signal, a plurality of preamplifiers with the same quantity as array detector pixels, a plurality of threshold comparators with the same quantity as the preamplifiers, and the FPGA chip of a plurality of channels with the same quantity as the threshold comparators, wherein the preamplifiers are used for amplifying the weak current signal to a voltage signal; the threshold comparators are used for comparing the voltage signal with reference voltage, and generating a timing stop pulse signal used for marking the laser echo signal; and the FPGA chip is used for measuring a time difference between the received timing stop pulse signal and a timing start pulse signal, and obtaining the pulse flight time. The system realizes high-accuracy, wide-range and high-speed array signal measurement through multi-channel signal processing.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Multi-sending and multi-receiving acoustic measurement method for oceanic internal waves
InactiveCN103063253AReduce dissipationReduce lossesAcoustic wave reradiationMeasurement devicePropagation time
The invention relates to a multi-sending and multi-receiving acoustic measurement method for oceanic internal waves. According to the method, sound wave signals with frequency bands are sent through an internal wave measurement device, travel time of the sound wave signals with the frequency bands in the vertical direction in seawater is measured, after influences of a factor of background environmental is removed, echo time disturbance is obtained and combined with dynamics property of the internal waves, the relation between the echo time disturbance and the amplitude of the internal waves is built, so that change of crucial hydrology parameters such as temperature, salinity and flow rate of whole water depth caused by the internal waves is obtained, and therefore the purpose of observation on the oceanic internal waves is achieved. The multi-sending and multi-receiving acoustic measurement method for the oceanic internal waves can be widely used for the observation on the oceanic internal waves, particularly for the observation on internal waves in a deep sea.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
Magnetic resonance imaging methods and compositions
InactiveUS20030120151A1Minimize the differenceMaximize intensity differenceNanomedicineDiagnostic recording/measuringVentricular cavityBlood vessel
Methods and compositions are provided for magnetic resonance imaging of biological tissue, particularly methods and compositions for 23Na and 39K magnetic resonance imaging of cardiac tissue. In particular, methods of 23Na magnetic resonance imaging (MRI) cardiac imaging is presented for attenuating 23Na signals corresponding to ventricular cavity blood and viable well-perfused tissue and for visualizing myocardial infarction. Cardiac tissue is imaged using 23Na MRI after the introduction of an intravascular paramagnetic contrast agent. Optimally, the intravascular paramagnetic contrast agent is MION-46. The MION-46 suppresses the blood signal intensity in sodium images of ventricular cavities and signal for viable cardiac tissue. The quantity of MION-46 and the echo time (TE) for 23Na MRI of cardiac tissue may be selected to minimize signal intensity differences between ventricular cavity blood and well-perfused viable myocardium; maximize signal intensity differences between non-viable myocardium and ventricular cavity blood in myocardial infarction; and maximize signal intensity differences between non-viable myocardium and well-perfused viable myocardium in myocardial infarction.
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Self-calibration methods for parallel imaging and multipoint water-fat separation methods
A method for generating a self-calibrating parallel multiecho magnetic resonance image is provided. A magnetic resonance imaging excitation is applied. A first echo at a first echo time in a first pattern is acquired. A second echo at a second echo time different from the first echo phase in a second pattern different from the first pattern is acquired. The acquired first echo and acquired second echo are used to generate an image in an image pattern, wherein none of the acquired echoes for generating the image have the same pattern as the image pattern.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV +1
Device for measuring a fill level of a liquid in a container
InactiveUS6427532B1Low production costLeveling precisionSubsonic/sonic/ultrasonic wave measurementMachines/enginesUltrasonic sensorUltrasound
A device for measuring a fill level of a liquid includes an ultrasonic sensor with two sensor elements. One of the sensor elements determines the echo time of an ultrasonic wave to a float which follows the liquid level. The other of the sensor elements determines the echo time of the ultrasonic wave up to a measuring reflector arranged at a known distance from the other of the sensor elements. An evaluation unit compares the echo times and determines the fill level of the liquid from the ratio of echo times and from the known distance to the measuring reflector.
Owner:CONTINENTAL AUTOMOTIVE GMBH
Transverse relaxation time measuring method and system
ActiveCN102116856ARelaxation time signal-to-noise ratio optimizationImprove accuracyMeasurements using NMR imaging systemsSignal-to-noise ratio (imaging)Signal-to-quantization-noise ratio
The invention provides a transverse relaxation time measuring method. The method comprises the following steps of: acquiring an echo signal; fitting the echo signal to acquire a prior estimate value of the relaxation time; and calculating echo time interval according to the prior estimate value, and feeding the echo time interval to the fitting calculation to acquire a measurement value of the relaxation time. Through rough estimation on the relaxation by the fitting calculation, the transverse relaxation time measuring method and system realize optimization on the signal to noise ratio of the relaxation time in the echo signal, so that the accuracy of relaxation time measurement is effectively improved.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Method and magnetic resonance tomography apparatus for correcting changes in the basic magnetic field
ActiveUS20050033156A1Magnetic measurementsDiagnostic recording/measuringPhase correctionPhase difference
In a method for calculating a one-dimensional map of the base magnetic field B0 and subsequent correction, based on this map, of image artifacts due to B0 field changes, in the examination of a subject with a magnetic resonance tomography apparatus, data for a slice of the subject to be examined are obtained with a sequence of a fast MRT imaging method that includes at least three phase correction scans and measurement signals of the respective phase correction scans as well as of the slice are obtained, the phase difference of the data points (respectively pertaining to one another) of two phase correction scans, in the form of the acquired measurement signals of the respective phase correction scans, are calculated point-by-point, the average phase difference between the phase correction scans is evaluated, and the frequency offset between the actual resonance frequency relative to the adjusted resonance frequency is calculated based on the average phase difference and the echo time difference between the phase correction scans used, a B0 field map is calculated dependent on the frequency offset and, the measurement data for the slice are corrected using the calculated B0 field map.
Owner:SIEMENS HEATHCARE GMBH
Multi-scale convolutional neural network-based heavy rainfall and thunderstorm prediction method and system
ActiveCN108508505ASmall spaceTargetedWeather condition predictionNeural architecturesRadarThunderstorm
The invention relates to a multi-scale convolutional neural network-based heavy rainfall and thunderstorm prediction method and system. The method of the invention includes the following steps that: original radar echo data are acquired; the original radar echo data are preprocessed, so that radar echo time series images can be obtained; any three frames of radar echo time series images which aregenerated consecutively are selected, a radar echo convolutional neural network is constructed, and the next frame of radar echo image can be inferred; and radar echo change within one minute is inferred by means of an optical flow field method and a linear interpolation method. With the method adopted, thunderstorm weather in one hour can be predicted, and the space range of thunderstorm weatherprediction can be narrowed to be a range within 1 km.
Owner:南京云思创智信息科技有限公司
Method for realizing echo time delay positioning
InactiveCN101026659AAccurate estimateSmall amount of calculationTwo-way loud-speaking telephone systemsSpeech analysisOccupancy rateCommunications system
Characters of the method are that carrying out lowpass filtering and lowering sample process for input signals from far end and near end of communication system; carrying out cross correlation calculation for lowering sample processed input signals; obtaining two maximal cross correlation values and relevant positions so as to reduce amount of calculation for estimating echo time delay. Comparing with prior art, the invention possesses advantages: reducing amount of calculation greatly; coefficient of adaptive filter does not need increment as echo time delay lengthens when being applied to echo canceller; ensuring to estimate echo time delay accurately under condition of lowered occupancy rate of resources and cost; flexible configuring parameter to extend length of time delay so as to promote application range of echo canceller.
Owner:ZTE CORP
Method for accurately measuring nuclear magnetic resonance porosity of oil-containing shale
InactiveCN105866002AEasy to determineAccurately determineAnalysis using nuclear magnetic resonancePermeability/surface area analysisPorosityNMR - Nuclear magnetic resonance
The invention provides a method for accurately measuring the nuclear magnetic resonance porosity of oil-containing shale. According to the method, nuclear magnetic resonance T2 spectral distribution and porosity of kerosene shale different in waiting time and echo interval are measured, the oil-containing shale porosity is compared with the helium porosity with respect to calibration waiting time and echo intervals, and the nuclear magnetic resonance T2 spectral distribution obtained at the time of the optimum echo time and the echo interval can represent reservoir physical property traits of the oil-containing shale. According to the method, factors influencing the measuring accuracy of the nuclear magnetic resonance porosity of the oil-containing shale are ascribed to the type and measurement parameters (waiting time and echo intervals) of sample saturated fluid, and the hydration influence of a shale sample is eliminated through saturated kerosene; the optimum waiting time and echo intervals are calibrated by analyzing T2 spectral distribution variation and the helium porosity; by means of the method, nuclear magnetic resonance T2 spectral distribution and porosity of the kerosene shale different in waiting time and echo interval are measured, thus the optimum measurement parameters which can accurately represent the porosity of the oil-containing shale can be obtained, test operation is simple and easy to conduct, and operability is great.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Method and system for engine cooling system control
ActiveUS20160186649A1Increase the number ofImprove reliabilityAir-treating devicesMeasurement deviceFluid levelUltrasound
Methods and systems are providing for improving engine coolant level estimation to reduce engine overheating. The level of fluid in a coolant overflow reservoir is inferred based on the fluid level in a hollow vertical standpipe fluidically coupled to the reservoir at top and bottom locations, while the fluid level in the standpipe is estimated based on output from an ultrasonic signal transmitted by a sensor positioned in a recess at the bottom of the vertical standpipe. The sensor uses a combination of raw echo times and processed fluid level data to estimate the fluid level accurately and reliably.
Owner:FORD GLOBAL TECH LLC
Phase insensitive preparation of single-shot rare for diffusion imaging
InactiveUS6489766B1Measurements using NMR imaging systemsElectric/magnetic detectionMagnetizationSingle shot
A method for eliminating then on-MG component in RARE imaging that does not require a poor slice profile or discarding a substantial number of echoes (FIG. 2). This method relies upon the observation that the magnetization in each component is determined by the phase at one half of the echo time before the first refocusing pulse. A ninety degree pulse applied at this time will rotate one of the components to the longitudinal axis where it will be invisible in the subsequent sequence, (b RF). If the phase of the ninety degree pulse is the same as that of the refocusing pulses, then it will be the non-MG component that is eliminated. The combination of the tailored RF train and this ninety degree pulse permits acquisition of data from the very first echo without artifact (FIGS. 2, 4).
Owner:THE TRUSTEES OF THE UNIV OF PENNSYLVANIA
Method for fast multi-slice mapping of myelin water fraction
InactiveUS20090312625A1Increasing volume coverageShorten the construction periodMagnetic measurementsCharacter and pattern recognitionDiseaseMulti slice
Mapping of myelin water content in white matter may provide important information for early diagnosis of multiple sclerosis and the detection of white matter abnormality in other diseases. It is disclosed here that free induction decay (FID) of each voxel at multiple slice locations is acquired in the brain using an echo-planar spectroscopic imaging (EPSI) pulse sequence. The multi-slice EPSI acquisition is designed to have a short first echo time (˜2 ms) and echo-spacing (˜1 ms) in order to acquire multiple sampling points during the fast decay of the myelin water signal. Multi-compartment analysis is then applied to the FID in each pixel using a 3-pool model of white matter to obtain quantitative maps of the myelin water fraction. Using this technique, the MR data for whole brain mapping of the myelin water can be acquired in less than 10 minutes, making this technique feasible for routine clinical applications.
Owner:UNIV OF COLORADO THE REGENTS OF
Generalized Method for MRI Chemical Species Separation Using Arbitrary k-space Trajectories
ActiveUS20080048659A1Eliminate the effects ofMagnetic measurementsElectric/magnetic detectionData setChemical species
A method for producing images of a subject containing M spin species using a magnetic resonance imaging (MRI) system includes obtaining N k-space data matrices from N k-space data sets acquired with the MRI system using a pulse sequence with an individual associated echo time. The k-space data matrices each include corresponding data at the same plurality of k-space locations and time stamps are tracked for each k-space location. For each k-space location, a set of linear equations in k-space is solved. The set of linear equations relates corresponding data from the N k-space data matrices, echo times and time stamps to desired calculated k-space data. Calculated data in k-space which is corrected for chemical shift is produced corresponding to each k-space location and aggregated to obtain a k-space calculated data set. The k-space calculated data set is transformed to image space to obtain a corresponding image.
Owner:WISCONSIN ALUMNI RES FOUND
Multibeam depth measuring method based on roll stabilization strategy and system thereof
ActiveCN104181523AReal-time computing is easy to implementEnsuring Beamwidth CoverageRadio wave reradiation/reflectionAcoustic wave reradiationPhase controlTime shifting
The invention provides a multibeam depth measuring method based on a roll stabilization strategy and a system thereof. The multibeam depth measuring method comprises the steps of: a step 101), forming a receiving wavebeam according to a phase control angle beta after rolling stabilization; a step 102) estimating an echo arriving time T0 by means of amplitude phase information of a signal after wave beam formation; a step 103) determining a synthetic wavebeam angle-of-spread gamma of an echo arriving time according to an emitting surface equation and a receiving surface equation; and a step 104) using the synthetic wavebeam angle-of-spread gamma as an initial incidence angle alpha0 of a sound ray, and utilizing echo time T0 for performing sound speed correction and coordinate homing. The step 101) further comprises steps of: step 101-1) receiving a relative gesture yawing phi, a pitch P and a roll R through a sensor in system operation period; and a step 101-2) operating a receiving phase control angle betan=thetan+R according to the roll angle R, and performing time shift wavebeam forming according to the obtained phase control angle.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Direct locating method based on external radiation source time delay and Doppler frequency
InactiveCN105929389AReduce lossesAvoid positionRadio wave reradiation/reflectionData informationTime delays
Owner:THE PLA INFORMATION ENG UNIV
Backing up distance measurement method, device and system
InactiveCN103969649AReduce collision accidentsShort reaction timeAcoustic wave reradiationEcho signalDistance measurement
The invention discloses a backing up distance measurement method, device and system, and belongs to the technical field of cars. The backing up distance measurement method comprises the steps of controlling one of a plurality of first ultrasonic transducers to emit ultrasonic waves and determining the time point of emitting the ultrasonic waves; controlling the first ultrasonic transducers to receive echo signals at the same time, and respectively determining the echo time points of receiving the echo signals by the ultrasonic transducers; according to the difference between the emission time point and the echo time points of receiving the echo signals, calculating the perpendicular distance between the cars and obstacles. According to the backing up distance measurement method, device and system, a controller is used for carrying out one-emission and many-reception distance measurement control on the first ultrasonic transducers, the response time of distance measurement by the system is shortened, the sensitivity of distance measurement by the system is improved, and the phenomenon that due to the fact that alarms about the information of the obstacles are not timely, collision accidents are caused can be effectively reduced.
Owner:CHERY AUTOMOBILE CO LTD
Magnetic resonance imaging of different chemical species in a system having magnetic field heterogeneities
ActiveUS7349729B2Good estimateImprove Noise PerformanceDiagnostic recording/measuringMeasurements using NMR imaging systemsShort echo timeSource image
A multi-point chemical species (e.g., water, fat) separation process which is compatible with rapid gradient echo imaging such as SSFP uses an iterative least squares method that decomposes water and fat images from source images acquired at short echo time increments. The single coil algorithm extends to multi-coil reconstruction with minimal additional complexity.
Owner:THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV
Method and apparatus for improved metabolite signal separation in MR spectroscopy
InactiveUS6987997B1Improved in vivo spectroscopic measurementReduce overlapDiagnostic recording/measuringMeasurements using NMR imaging systemsMetaboliteSpectroscopy
A technique is set forth for MR spectroscopy that is capable of reducing signal overlap between metabolite signals for improved clinical analysis of metabolite content. The technique includes varying an echo time across a scanning dimension. Once a span of echo time for an acquisition dimension is determined, and the number of acquisition data points is known, a variance between echo times can be determined. A pulse sequence with differing echo times is then applied for each frame, and after data is acquired, an image is reconstructed that significantly improves metabolite signal separation.
Owner:GENERAL ELECTRIC CO
Method for performing ultrasonic testing
ActiveUS20110090935A1Thermometer detailsMaterial analysis using sonic/ultrasonic/infrasonic wavesUltrasonic attenuationThermal expansion
A method for performing ultrasonic testing comprising, in one embodiment, the steps of firing an ultrasonic transducer to generate an ultrasonic pulse that passes through a delay line, measuring a delay echo time of flight, and determining the temperature of the delay line using the delay echo time of flight, thereby eliminating the need for additional temperature measuring devices. Other embodiments further comprise the step of using the temperature of the delay line to determine the temperature of a test object, and using the temperature of the test object to determine a thickness of the test object that is compensated for thermal expansion and temperature dependent ultrasonic velocity.
Owner:GE INSPECTION TECH LP
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