43 results about "Resonance measurement" patented technology

The invention belongs to the field of magnetic resonance measurement signal noise filtering, and particularly relates to a ground magnetic resonance signal sparse denoising method of a combined dictionary, which comprises the following steps: reconstructing a power frequency harmonic component of a magnetic resonance signal according to frequency bands, and eliminating power frequency harmonics from the magnetic resonance signal to obtain a power frequency-removed signal; constructing a track matrix Z by adopting a Gaussian random matrix, constructing a track matrix Y by adopting a power frequency-removed signal, taking first K columns of the track matrix Z and normalizing to obtain an initial dictionary D, and using the track matrix Y as an original sample for constructing a sparse coefficient matrix X; updating the initial dictionary D and the sparse coefficient matrix X through K-SVD dictionary learning, and reconstructing a track matrix by adopting the updated dictionary # imgabs0 # and the sparse coefficient matrix # imgabs1 # to obtain a track matrix W; and obtaining a pure magnetic resonance signal by taking the first row of the track matrix W, and realizing effective removal of MRS signal noise in a complex electromagnetic interference scene under the condition of single signal acquisition.

The invention relates to the technical field of oil-water detection equipment, and discloses an oil-water detector and method based on a liquid mass resonance measurement principle. The oil-water detector based on the liquid mass resonance measurement principle comprises a parameter sensing unit which is used for contacting an oil-water mixed medium in a pipeline and comprises a current carrying body with a measurement cavity, a measurement probe arranged in the measurement cavity and a resonance body arranged in the measurement probe; and the data processing unit is in signal connection with the parameter sensing unit and comprises a signal transmitting module which is used for transmitting an audio frequency sweep frequency signal to the resonant body to excite liquid column resonance and transmitting electromagnetic short waves with a preset frequency to an oil-water mixed medium at the same time. According to the invention, direct measurement of the density and the dielectric constant is fused, the phase state is identified by using an intelligent algorithm, and the model is switched, so that the problem of failure of a single principle technology in a specific phase state is solved, and high-precision measurement in a water-in-oil state or an oil-in-water state in a full range from pure water to pure oil is realized.

In a general aspect, a magnetic resonance system performs magnetic resonance measurements. In some examples, a magnetic resonance system includes a data processing device and a superheterodyne spectrometer system. The data processing device generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress a mirror sideband in the magnetic resonance control signal. The superheterodyne spectrometer generates a magnetic resonance control signal based on the digital IF signal information.

The invention relates to a current measurement method, electronic equipment and a readable storage medium. The method comprises the following steps: acquiring an initial resonant frequency of the quantum current sensor, and outputting a microwave modulation signal according to the initial resonant frequency; performing optical detection magnetic resonance measurement operation based on the microwave modulation signal, obtaining a measurement response signal for the microwave modulation signal, and demodulating the measurement response signal to obtain a demodulation component; when the demodulation component is not matched with the demodulation component target value, the PID parameter is adjusted, and the microwave frequency of the microwave modulation signal is adjusted based on the adjusted PID parameter until the demodulation component is matched with the demodulation component target value; a microwave frequency when the demodulation component matches the demodulation component target value is determined as a microwave resonance frequency, and a current measurement value is determined on the basis of the microwave resonance frequency. By adopting the method, the current measurement efficiency of the quantum current sensor can be improved.

The invention relates to a method for correcting the influence of interfering effects on a gradient system of a magnetic resonance device during a magnetic resonance measurement, having the following steps: emitting a gradient pulse by means of an amplifier of the gradient system; detecting a gradient profile; detecting an output signal of the amplifier for the gradient pulse; determining a gradient system transfer function; and determining an output signal of the amplifier, which provides the desired gradient profile at the output signal. The invention also relates to a correction device, which is designed to adjust an input signal of the amplifier in accordance with the determined output signal of the amplifier and the detected output signal of the amplifier. Furthermore, the invention relates to a magnetic resonance device and a magnetic resonance system having the correction device, as well as a computer program product having a computer program and a computer-readable medium for carrying out the method according to the invention.

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

In a general embodiment, a magnetic resonance system performs magnetic resonance measurements. In some examples, the magnetic resonance system includes a data processing unit and a superheterodyne spectrometer system. The data processing unit generates digital intermediate frequency (IF) signal information based on the pulse profile. The digital IF signal information is configured to suppress image sidebands in the magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

Discloses is a magnetometer and a method of carrying out magnetometry. A sensor element comprising a sheet of a 2D layered material having a photon-emitting spin-active defect is provided. The defect has a spin triplet state with first, second and third non-degenerate spin sublevels in the absence of applied magnetic field. An optically detected magnetic resonance measurement is conducted on the sensor element by subjecting the sensor element to optical excitation and photoluminescence detection whilst a variable frequency microwave signal is applied, the microwave signal causing transitions between the spin triplet state spin sublevels. The photoluminescence detection comprises: detecting a change in photoluminescence signal when the microwave signal is resonant with a transition between the spin triplet state spin sublevels; and determining a characteristic of a magnetic field based on the detected photoluminescence signals.

A method according to the invention for acquiring T2*-weighted measurement data of a test object using a magnetic resonance system comprises the steps: - irradiating a first RF excitation pulse to excite spins in a first layer in the test object, - switching gradients to generate at least one gradient echo signal, - after an echo time following the irradiation of the first RF excitation pulse, acquiring a first gradient echo signal from the first layer, - after the irradiation of the first RF excitation pulse and before the elapsed echo time following the first RF excitation pulse, irradiating at least one further RF excitation pulse to excite spins in a further layer,wherein, before the application of a further RF excitation pulse and after each RF excitation pulse preceding the further RF excitation pulse, a pre-rephasing gradient of a moment corresponding to the further RF excitation pulse following the pre-rephasing gradient is switched, - recording generated further gradient echo signals from further layers. By switching the pre-rephasing gradients according to the invention, gradient echo signals of the spins of different layers excited by the first RF excitation pulse and the at least one further RF excitation pulse can be separated. Thus, the echo time TE, which elapses until a first gradient echo signal is measured after the first RF excitation pulse, can be used to generate and measure further gradient echo signals in further layers after the first gradient echo signal, which increases the readout efficiency.

The invention relates to a method for performing a magnetic resonance measurement comprising multiple partial measurements, a magnetic resonance device, and a computer program product. According to the method, a first partial measurement is performed during a first period of time, and a second partial measurement is performed after the first partial measurement. The second partial measurement comprises the application of an excitation pulse to excite a magnetic resonance signal. During the first period of time, at least part of a pulse calculation of the excitation pulse is performed.

The present invention discloses a method for optimizing the sampling trajectory of a molecular exchange magnetic resonance (MEL) measurement. The method includes the steps of: (1) determining the number and corresponding range of physiological / physical parameters of a molecular exchange system and generating a simulated physiological / physical parameter dataset; (2) determining a molecular exchange magnetic resonance measurement method and setting the acquisition parameters; (3) constructing an end-to-end integrated network model including a sampling trajectory optimization network, a noise signal generation network, and a parameter estimation network; and (4) training the network using the simulated physiological / physical parameters as input, and obtaining the optimized sampling trajectory and the corresponding parameter estimation network once the network has converged and training is complete. The present invention further discloses a molecular exchange magnetic resonance measurement method and apparatus. The method for optimizing the sampling trajectory of a molecular exchange magnetic resonance measurement provided by the present invention improves the efficiency and accuracy of physiological / physical parameter estimation and can be applied to various molecular exchange magnetic resonance measurement methods.

The invention relates to a saliva aspiration device (30) for an intraoral radio frequency coil (41), a combined intraoral aspiration device (40) and a magnetic resonance device (10). The present invention relates to a saliva aspiration device (30) comprising a body (31) and an aspiration opening (32) configured to be connected to a vacuum system (50), where the body (31) is configured to provide a mechanical connection between the saliva aspiration device (30) and an intraoral radiofrequency coil (41), where the intraoral radiofrequency coil (41) is configured to receive magnetic resonance signals from a tooth region of a patient (15), and where the intraoral radiofrequency coil (41) is configured to receive magnetic resonance signals from the tooth region of the patient (15). The suction opening (32) is configured to remove saliva from the oral cavity of a patient (15) during a magnetic resonance measurement, the combined intraoral suction device comprising the saliva suction device (30) of the invention, and the magnetic resonance device comprising the saliva suction device (30).

The present invention discloses a method for optimizing the sampling trajectory of molecular exchange magnetic resonance measurement, the method comprising: (1) determining the number and corresponding range of physiological / physical parameters of a molecular exchange system, and generating a simulated physiological / physical parameter data set; (2) determining a molecular exchange magnetic resonance measurement method and setting acquisition parameters; (3) constructing an end-to-end unified network model, including a sampling trajectory optimization network, a noise signal generation network, and a parameter estimation network; (4) using the simulated physiological / physical parameters as input for training until the network converges and the training is completed, thereby obtaining an optimized sampling trajectory and a corresponding parameter estimation network. The present invention also discloses a molecular exchange magnetic resonance measurement method and device. The method for optimizing the sampling trajectory of molecular exchange magnetic resonance measurement provided by the present invention improves the efficiency and accuracy of physiological / physical parameter estimation, and can be applied to different molecular exchange magnetic resonance measurement methods.

The invention relates to a method for monitoring a magnetic resonance measurement, a magnetic resonance device, and a computer program. During the magnetic resonance measurement, monitoring values ​​are acquired. These monitoring values ​​are quantized to generate monitoring memory values. The monitoring memory values ​​are stored as a prefix-free code in a memory unit. The magnetic resonance measurement is then monitored for compliance with a monitoring limit value based on these stored monitoring values.

In a dielectric characteristic measurement method, a step of mounting a sample of which dielectric characteristic is measured on an open resonator and adjusting a position of the sample includes: a first measurement step for performing a first resonance measurement by sweeping a predetermined sweep frequency range at a first number of measurement points; and a second and subsequent measurement steps for performing a plurality times of resonance measurement following the first resonance measurement, wherein each of the plurality times of resonance measurement is performed by sweeping a sweep frequency range specified based on an immediately preceding resonance measurement at a second number of the measurement points which is less than the first number of the measurement points, and the sweep frequency range of a second resonance measurement in the plurality times of resonance measurement is specified based on the first resonance measurement.

A computer-implemented method for determining correct operation of a receiving system of a magnetic resonance device using of a magnetic resonance measurement, by: acquiring a magnetic resonance image using the receiving system during the magnetic resonance measurement, determining a noise distribution of the acquired magnetic resonance image by means of a computing unit, and determining correct operation of the receiving system by means of the computing unit on the basis of the noise distribution. Also, a magnetic resonance device, having a computing unit which is designed to coordinate the computer-implemented method and execute the by means of the magnetic resonance device.

A local coil including an antenna, base element, holding element, first and second guide mechanisms, and safety mechanism. The antenna receives high-frequency signals in a frequency range and power range of a magnetic resonance measurement and is mechanically connected to the holding element. The base element holds the holding element together with the antenna in a position for use on a diagnostically relevant body region of a patient. The first guide mechanism is mechanically connected to the base element and the holding element and positions the holding element variably relative to the base element. The second guide mechanism is mechanically connected to the holding element and the antenna and positions the antenna variably relative to the holding element. The safety mechanism prevents a collision between the antenna and the patient during a transfer of the holding element from an open position into a closed position using the first guide mechanism.

The invention relates to a method for providing an image of a diagnostically relevant region of a jaw region of a patient by means of a magnetic resonance device, the method having the following steps: detecting (S1) information about the jaw region of the patient, the information comprising at least one indication of the position and / or extent of a diagnostically relevant region of the jaw region; adapting (S5) parameters of a magnetic resonance measurement in accordance with the detected information about the jaw region of the patient; performing (S7) a magnetic resonance measurement with the adapted parameters and detecting image data of the jaw region of the patient; reconstructing (S8) an image of the diagnostically relevant region of the jaw region from the detected image data; and providing (S9) the image of the diagnostically relevant region of the jaw region of the patient. The invention also relates to a magnetic resonance device comprising a computing unit (28), the computing unit being configured to coordinate and perform the above-mentioned method by means of the magnetic resonance device.

This invention discloses a microwave radiation structure and an optical magnetic resonance measurement system, relating to the field of microwave radiation structure technology. The microwave radiation structure includes a microwave input port, a carrier, a radiator, and a microwave output port, which are sequentially and electrically connected. The microwave input port and microwave output port are mounted on the carrier. The radiator and the carrier are not on the same horizontal plane. A support portion is provided on the carrier to support the radiator. During installation, the radiator is positioned between the measuring instrument and the sample area, while the carrier is not positioned between the measuring instrument and the sample area. Therefore, by using a support portion on the carrier to ensure that the radiator and the carrier are not on the same horizontal plane, the thickness limitations of existing radiation structures are overcome during optical magnetic resonance measurement, meeting the low-distance requirement between the sample area and the objective lens, improving the field of view adjustment range of the sample area, and the structure is simple, easy to manufacture, and inexpensive.

The disclosure relates to a saliva suction device for an intraoral radio-frequency coil, comprising a body and a suction opening configured to be connected to a vacuum system, wherein the body is configured to provide a mechanical connection between the saliva suction device and the intraoral radio-frequency coil, wherein the intraoral radio-frequency coil is configured to receive magnetic resonance signals from a dental region of a patient, and wherein the suction opening is configured to remove saliva from an oral cavity of the patient during a magnetic resonance measurement. The disclosure also relates to a combined intraoral suction device comprising a saliva suction device and a magnetic resonance device comprising a saliva suction device.

The invention relates to the technical field of magnetic resonance imaging, and provides an ASL perfusion imaging method, device and system based on multi-parameter magnetic resonance measurement, and the method comprises the steps: determining a first parameter based on first magnetic resonance measurement data, determining a second parameter based on second magnetic resonance measurement data, and determining a third parameter based on third magnetic resonance measurement data, and determining mark delay time of ASL perfusion imaging based on the first parameter, the second parameter and the third parameter, and performing ASL perfusion imaging based on the mark delay time. Wherein the first parameter comprises blood vessel path length information, the second parameter comprises blood flow velocity information, and the third parameter comprises blood longitudinal relaxation time. Examination time does not need to be prolonged, and more appropriate marking delay time can be matched for different subjects so as to improve the accuracy of examination results.

The present disclosure refers to a method for detecting dirt and for cleaning a surface of a lens system or lens cover of a camera device with at least one piezo transducer mechanically coupled to said surface, wherein the method comprises the following steps: a) activating the at least one piezo transducer for removing dirt via vibrations, b) determining the result of the dirt removing in step a) via a mass resonance measurement method, c.1) in case the determined mass has not changed, repeating the sequence of steps a) and b), c.2) in case the determined mass has been reduced below a first threshold, stopping the method, c.3a) in case the mass determined in step b) is above a second threshold conducting an optical blockage detection method, and c.3b) in case an optical blockage is detected in the field of view of the camera device in step c.3a), initiating at least one countermeasure, or in case no optical blockage is detected in the field of view of the camera device in step c.3a), stopping the method. It also refers to a device for conducting said method and an automotive part with such a device.

The invention relates to a method for monitoring a magnetic resonance measurement, a magnetic resonance device, and a computer program. During the magnetic resonance measurement, monitoring values ​​are acquired. These monitoring values ​​are quantized to generate monitoring memory values. The monitoring memory values ​​are stored as a prefix-free code in a memory unit. The magnetic resonance measurement is then monitored for compliance with a monitoring limit value based on these stored monitoring values.

The application discloses a microwave radiation structure for optical magnetic resonance measurement and a manufacturing method thereof, wherein the microwave radiation structure comprises a substrate provided with a through hole, a microwave input port, a microstrip line, a supporting part, a radiation part and a microwave output port arranged on the substrate, the microstrip line is provided with a bending part, the microstrip line is connected with the microwave input port, the radiation part and the microwave output port respectively, the supporting part is used for positioning the radiation part directly above the through hole, the radiation part is used for forming a microwave magnetic field in a resonance state, and the bending part is used for adjusting the resonance frequency of the radiation part. Therefore, the radiation part is positioned directly above the through hole through the supporting part, so that the microwave radiation structure generates a magnetic field at the through hole, and the resonance frequency of the radiation part is adjusted through the bending part arranged on the microstrip line, thereby improving the radiation efficiency of the microwave radiation structure, reducing the occupied space of the substrate, and making the microwave radiation structure adapt to different use scenarios.

In a general aspect, a magnetic resonance system performs a magnetic resonance measurement. In some examples, a magnetic resonance system includes data processing apparatus and a superheterodyne spectrometer system. The data processing apparatus generates digital intermediate frequency (IF) signal information based on a pulse profile. The digital IF signal information is configured to suppress an image sideband in a magnetic resonance control signal. The superheterodyne spectrometer generates the magnetic resonance control signal based on the digital IF signal information.

The application relates to the technical field of magnetic resonance imaging, and provides an ASL perfusion imaging method, device and system based on multi-parameter magnetic resonance measurement, which comprises the following steps: determining a first parameter based on first magnetic resonance measurement data; determining a second parameter based on second magnetic resonance measurement data; determining a third parameter based on third magnetic resonance measurement data; determining a labeling delay time of ASL perfusion imaging based on the first parameter, the second parameter and the third parameter; and performing ASL perfusion imaging based on the labeling delay time. The first parameter comprises blood vessel path length information, the second parameter comprises blood flow velocity information, and the third parameter comprises blood longitudinal relaxation time. The application does not need to prolong the examination time, can match more suitable labeling delay time for different subjects, and improves the accuracy of the examination result.

The application discloses a kind of double-resonance MEMS sensor and its working method, double-resonance MEMS sensor includes: first oscillator, second oscillator, frequency discriminator and phase detector and delay control circuit;Oscillator includes resonator and resonance circuit, resonance circuit includes delayer;Resonator detects the capacitive signal generated by signal to be measured, resonance circuit is used to output analog feedback signal under the control of delayer according to capacitive signal, analog feedback signal is input into resonator to form closed loop circuit;Frequency discriminator and phase detector detect the frequency and phase of the digital signal input into two delayers, output control signal of delay control circuit when frequency difference is less than preset first threshold and phase difference is less than preset second threshold, and delay control circuit controls two delayers to carry out delay adjustment according to control signal, so that the phase of two analog feedback signals is out of step.The application can avoid the problem of resonance measurement blind area when the frequency of two resonators of double-resonance MEMS sensor is close.

A sensor device for magnetic field measurement using optical magnetic resonance measurement (ODMR) includes a sensor device for magnetic field measurement using ODMR, including a diamond having a plurality of nitrogen defects, a laser emitter, a photodetector, and a circuit board. The laser emitter is designed for the fluorescence excitation of the nitrogen defects, and the photodetector is designed to receive fluorescence radiation of the nitrogen defects. The circuit board has a plurality of layers comprising at least one inner layer; the laser emitter is disposed on an upper face of the circuit board; the photodetector is disposed on a lower face of the circuit board; the diamond is disposed in the interior of the circuit board in the plane of extension of the at least one inner layer; and at least one of the layers has current-carrying structures designed to produce a homogeneous magnetic field which is oriented perpendicularly to the layers of the circuit board and which permeates the diamond.

The disclosure relates to a method for ascertaining at least one pulse of a magnetic resonance sequence for a magnetic resonance measurement, a magnetic resonance apparatus, and a computer program product. According to the method, at least one magnetic field map and at least one homogeneity condition are provided. At least one pulse, which has been optimized based on the at least one magnetic field map, is ascertained by taking into consideration the at least one inhomogeneity region.