62 results about "Magnetic resonance technique" patented technology

The invention provides a nuclear magnetic resonance and image intelligent bimodal unfrozen water dynamic identification method and system, and belongs to the technical field of frozen soil engineering and geophysical exploration, and the method comprises the steps: sealing a frozen soil sample in a nuclear magnetic sample tube, and achieving the gradient cooling of the sample in a preset low temperature range through temperature control; scanning by using a nuclear magnetic resonance technology to obtain transverse relaxation time T2 spectrums and nuclear magnetic images of the frozen soil sample at different temperature nodes; after image preprocessing is carried out on the nuclear magnetic image, a temperature-signal intensity curve in the nuclear magnetic image is automatically extracted by utilizing an image recognition technology; carrying out integral calculation on a liquid water signal in the T2 spectrum, and dynamically calculating the content of the unfrozen water at each temperature based on a nuclear magnetic signal intensity formula; according to the method, a pore-fracture co-evolution matrix is constructed, accurate analysis of unfrozen water dynamic and pore evolution in the freezing and thawing process is realized, the method is suitable for hydrothermal coupling characteristic analysis of Qinghai-Tibet soil in a complex freezing and thawing environment, and reliable technical support is provided for stability evaluation of frozen soil engineering.

The present invention provides a directional wireless charging method based on magnetic resonance technology. The method includes a resonant coil that receives magnetic energy from a transmitting magnetic field through magnetic induction and outputs a resonant current with the same frequency as the transmitting magnetic field. The resonant current is input into a receiving coil to generate a receiving magnetic field with the same frequency as the transmitting magnetic field. The transmitting magnetic field and the receiving magnetic field form magnetic resonance for energy transmission. The present invention enables efficient one-to-one charging between a charging station and a vehicle without requiring precise positioning of the vehicle. Charging automatically stops when the distance between the vehicle and the charging station exceeds a set range.

The invention is suitable for the technical field of magnetic resonance, and provides a robot registration method and device, control equipment and a storage medium, and the method comprises the steps: obtaining a target magnetic resonance image of a development marker installed on a to-be-registered robot; performing image segmentation processing based on an adaptive threshold algorithm on the target magnetic resonance image to obtain target point cloud data of the development marker; according to the target point cloud data, determining position information of the developing marker in a magnetic resonance coordinate system corresponding to the magnetic resonance equipment; according to the position information, determining a target homogeneous transformation matrix of an end tool coordinate system of the robot under a magnetic resonance coordinate system; and the registration operation of the robot is completed by using the target homogeneous transformation matrix. According to the method, robot registration in a magnetic resonance environment is realized, noise reduction processing of the magnetic resonance image is realized in combination with an adaptive threshold algorithm, the determination accuracy of the point cloud data of the developing marker is improved, and the registration accuracy of the robot is further improved.

The present invention relates to a lacustrine shale conductive model and saturation evaluation method considering the influence of organic matter, belonging to the technical field of oil content evaluation of unconventional oil and gas reservoirs, including: 1) characterizing fluid information in shale samples based on pressure-maintained sealed samples and two-dimensional nuclear magnetic resonance technology; 2) classifying lacustrine shale lithology types according to shale organic carbon content and clay content, and analyzing the relationship between resistivity values ​​of different lithologies and free water and bound water porosity; 3) selecting siltstone interlayer samples, and inversely calculating the cementation index and saturation index of the inorganic pore conductive network; 4) establishing a lacustrine shale parallel conductive model, and calibrating rock electrical parameters by lithology; 5) establishing a lithology and lithology discrimination chart, a TOC prediction model, a bound water content prediction model and an effective porosity calculation model, and combining the lacustrine shale parallel conductive model to interpret oil saturation by different lithologies. The present invention provides accurate shale reservoir fluid information and provides a new idea for rock electrical parameter calibration.

The present disclosure provides an application of a composite nanozyme material in a tumor dual-targeted drug delivery system. The composite nanozyme material is used in the preparation of an anti-tumor injection or an implantable medicament. The composite nanozyme material has peroxidase-like activity, catalase-like activity, and glutathione oxidase-like activity. The application method includes: using the composite nanozyme material as a contrast agent to determine the location of the tumor by magnetic resonance; setting a magnetic field at the location of the tumor and injecting an injection or a medicament containing the composite nanozyme material. The present invention first uses a magnetic composite nanozyme material as a MIR contrast agent to determine the location of the tumor by magnetic resonance technology, and further utilizes the biological activity targeting of the composite nanozyme and the physical magnetic targeting of the external magnetic field of the tumor tissue to achieve the specific release of the chemotherapy drug functional molecule at the target site.

In a method for improving the recording of measurement data of an object under inspection, the method includes loading desired imaging parameters and a desired flip angle for recording the measurement data by means of a recording method, wherein the gradient to be switched for position encoding of the measurement data has its full intensity during the incident RF excitation pulse. A quantization value of a desired interference for the recording method is determined based on the desired imaging parameters, and a check on the feasibility of correcting for the interference is performed based on the quantization value and the desired flip angle.

The present invention relates to the field of magnetic resonance technology, and specifically to a magnetic resonance radio frequency transmitting coil structure with distributed capacitance. A magnetic resonance radio frequency transmitting coil structure with distributed capacitance includes an insulating dielectric layer, and is characterized in that: the insulating dielectric layer is in a birdcage-like structure; a plurality of outer conductors are evenly distributed on the outer surface of the insulating dielectric layer, and a plurality of inner conductors are evenly distributed on the inner surface of the insulating dielectric layer; the outer conductors and the inner conductors are staggered and evenly distributed on the inner and outer surfaces of the insulating dielectric layer, and overlaps are provided between adjacent outer conductors and inner conductors. Compared with the prior art, a magnetic resonance radio frequency transmitting coil structure with distributed capacitance is provided, which can reduce the wall thickness of the transmitting coil, increase the inner diameter of the transmitting coil, improve patient comfort, have low cost, good image quality, high safety, and can significantly reduce the weight of the coil, improve its softness, and improve its reliability.

The application provides a nuclear magnetic resonance and image intelligent dual-mode unfrozen water dynamic identification method and system, and belongs to the technical field of frozen soil engineering and geophysical exploration, and comprises the following steps: sealing a frozen soil sample in a nuclear magnetic sample tube, and realizing gradient cooling of the sample in a preset low temperature range through temperature control; scanning and acquiring a transverse relaxation time T2 spectrum and a nuclear magnetic image of the frozen soil sample at different temperature nodes by using a nuclear magnetic resonance technology; automatically extracting a temperature-signal intensity curve in the nuclear magnetic image by using an image recognition technology after image preprocessing of the nuclear magnetic image; performing integral calculation on liquid water signals in the T2 spectrum, and dynamically calculating the content of unfrozen water at each temperature based on a nuclear magnetic signal intensity formula; and constructing a pore-fracture collaborative evolution matrix, so that accurate analysis of the dynamic unfrozen water and pore evolution in a freezing and thawing process is realized, the water-heat coupling characteristics of Qinghai-Tibet soil under a complex freezing and thawing environment are analyzed, and reliable technical support is provided for stability evaluation of frozen soil engineering.

The present invention discloses a method, system, medium and electronic equipment for silent marking of magnetic resonance arterial blood flow, which belongs to the field of magnetic resonance technology. In the marking cycle, the present invention uses a triangular gradient to replace the traditional layer-selected trapezoidal gradient, and also replaces the triangular reconvergence gradient, and the average gradient required for the blood flow reversal condition is achieved by the difference between paired triangular gradients with positive and negative amplitudes. Similarly, in the control cycle, a triangular gradient is also used to replace the trapezoidal gradient and triangular gradient in the traditional practice, but the average gradient of the triangular gradient sequence is controlled to zero. The present invention uses a non-reconvergence gradient to achieve magnetic resonance arterial blood flow marking, which can greatly reduce the acoustic noise of blood flow marking.

This application discloses an image segmentation method, an electronic device, and a storage medium. The method includes: acquiring a first image and a second image of a target region of a biological object, wherein the target region includes a lesion area; the first image is obtained by scanning the target region using computed tomography (CT) technology, and the second image is obtained by scanning the target region using magnetic resonance imaging (MRI) technology; cropping the second image based on the region of the target region in the first image to obtain a cropped image; and performing image segmentation on the target region contained in the second image based on the first image and the cropped image to obtain a target segmentation result. This application solves the technical problem of low accuracy in segmenting lesion regions in CT and MRI images in related technologies.

Resting-state magnetic resonance imaging (fMRI) technology records brain activity by measuring the global blood oxygen saturation of the subject's brain, providing high spatial resolution data. Although the temporal resolution is lower, in elderly individuals at rest, the introduction of time series data still allows for good observation of the hemodynamic direction of individual pixels, making it one of the important evaluation indicators for intervention and treatment of brain diseases. The neural circuit features constructed based on a single brain region towards the whole brain are also an important evaluation method for fMRI data, namely, the quantification of the physiological interaction of the brain region towards the whole brain in a certain state. This invention constructs a method for quantifying the treatment effect of Alzheimer's disease (AD) based on resting-state magnetic resonance imaging (fMRI) technology. This method mainly addresses: (1) the difficulty in quantifying the rehabilitation effect during the treatment of AD patients; and (2) the quantification of the rehabilitation effect of different treatment modes during the treatment of AD patients.

The invention belongs to the technical field of magnetic resonance, and discloses a magnetic resonance radio frequency coil scanning auxiliary device which comprises a moving mechanism, and the moving mechanism comprises a motor, a gear, a rack, a fixing hole, a moving bed, a fixing seat, a first cavity, a push plate, a fixing block and a first spring. Through cooperation of structures such as the rack and the moving bed, a patient can be conveniently and safely transferred, when the patient is in a coma or severely injured state and cannot move, the motor is started to enable the rack to drive the moving bed on the sickbed main body where the patient lies to move to the scanning bed through transmission, and the scanning bed can scan the patient. A patient which cannot move can be stably transferred from a sickbed to a scanning bed, secondary injury possibly caused by manual carrying is avoided, manpower is saved, the patient can receive scanning examinations such as magnetic resonance more conveniently, and a doctor can timely and accurately obtain illness state information of the patient.

The invention discloses a magnetic resonance arterial marker image quality evaluation method and system and electronic equipment, and belongs to the technical field of magnetic resonance. The method comprises the following steps: S1, obtaining a to-be-evaluated ASL image, and recognizing a grey matter region and a white matter region in the ASL image; s2, based on signals in a grey matter area and a white matter area in the ASL image, respectively calculating seven quantitative index values including a grey matter-white matter signal ratio, a grey matter variable coefficient, a joint variable coefficient, a contrast noise ratio, an abnormal value ratio, grey matter area connectivity and index structure similarity; and S3, normalizing the seven index values of the ASL image to be evaluated, and inputting the normalized seven index values into a pre-constructed and fitted logistic regression model to obtain an evaluation result representing the quality of the image. The 3D ASL image quality evaluation method can be directly used for quality evaluation of 3D ASL image data acquired clinically and mainstream, and a quick and effective tool is provided for clinical image screening.

The present invention provides a body surface abnormally shaped positioning sticker for nuclear magnetic resonance examination, which relates to the technical field of nuclear magnetic resonance. It aims to solve the problem that common positioning marks are mostly in a covering mode, and the previous positioning marks can only locate the general position and cannot mark the range of the affected area. It includes a positioning sticker; the positioning sticker is composed of a storage sticker, a main body, and a silica gel sticker; for the storage sticker, the main body is movably connected above the storage sticker; for the main body, the main body adopts a design of multiple concentric circles and concentric rings; for the silica gel sticker, the silica gel sticker is movably connected to one side of the main body, and the silica gel sticker is arranged between the storage sticker and the main body. With the setting of the main body of the present invention, there are various shapes in one sticker, which can be used alone or in combination with single stickers and multiple stickers, and can mark a larger affected area in a covering mode or an enclosing mode to replace the traditional covering positioning sticker, especially for more accurate positioning of the range of the affected area when the skin condition of the affected area does not allow it.

This invention discloses a high signal-to-noise ratio (SNR) magnetic resonance (MRI) data acquisition method, signal processing method, and system, belonging to the field of MRI technology. The invention aims to maximize the image SNR while maintaining spatial resolution by simultaneously optimizing the radio frequency flip angle sequence of the echo train and the k-space filtering weights through a joint optimization framework. This invention can obtain high-quality MRI images, fundamentally improving the image quality of FSE sequences.

This invention discloses a method for playing back nuclear magnetic resonance (NMR) pulse data, a transceiver, and an NMR spectrometer, relating to the field of NMR technology. The method includes: outputting periodic delayed trigger signals to each non-target transceiver, enabling each non-target transceiver to determine a target delay amount based on the delayed trigger signals and to perform signal acquisition based on the target delay amount; reading event frames from a first buffer and parsing each read event frame, storing the parsed event parameters in a sequence FIFO within an FPGA chip, where each event frame has a preset length; and, after all transceivers are ready, outputting playback trigger signals to each non-target transceiver, enabling all transceivers to synchronously play the event frame sequence in their respective sequence FIFOs. Thus, the clock jitter problem in multi-transceiver synchronization is solved through delay calibration, the use of fixed-length frames reduces parsing complexity, high-precision synchronous playback of multiple transceivers is achieved, and the signal-to-noise ratio and stability of NMR detection are improved.

The invention relates to the technical field of unconventional shale oil and gas reservoir exploration, in particular to a method, device and equipment for predicting shale oil imbibition utilization efficiency and a storage medium. According to the method, under the condition that the rock core is not damaged, the content of oil in different aperture intervals after the rock core is pressurized and saturated with oil is rapidly quantified through the two-dimensional nuclear magnetic resonance technology, and then the content of oil in the shale oil in different aperture intervals under the stratum condition and the overall critical use lower limit are utilized; the imbibition and oil discharge efficiency of the whole shale oil core can be rapidly, accurately and quantitatively represented. The shale oil core imbibition utilization efficiency can be rapidly and accurately measured under the condition that the core is not damaged, and the method provides an effective means for revealing an interaction reaction mechanism of shale oil reservoir rock and an injected medium, a shale oil reservoir rock imbibition oil extraction mechanism, a shale oil reservoir recovery efficiency improving mechanism and the like. The method has important engineering value and scientific significance for promoting effective economic development of shale reservoirs in China.

An inventive method for separating measurement data of an object under investigation, which are recorded simultaneously as collapsed from a plurality of layers of the object under investigation using an in-plane acceleration technique with an undersampled scanning pattern of k-space corresponding to the acceleration technique, into single-layer measurement data comprises the steps: - Acquiring reference measurement data in at least two segments such that a complete set of reference measurement data according to Nyquist is obtained, and that a sampling pattern used when acquiring the reference measurement data within a segment corresponds to an acceleration factor that also corresponds to the sampling pattern of the collapsed measurement data, - Recording the collapsed measurement data, - Generating separation data based on reference measurement data recorded in at least one of the at least two segments, - Separating the collapsed measurement data into single-layer measurement data using the generated separation data.

The invention discloses a calibration radio frequency power acquisition method and system and a radio frequency power-flip angle mapping function establishment method and system thereof, and relates to the technical field of magnetic resonance, and the method comprises the steps: employing a DERA sequence to carry out the multiple scanning of a target object; wherein different radio frequency powers are applied in each scanning, so that the preset overturning angle range is 0-90 degrees; respectively acquiring the intensity of the echo signals of two different echo times in each scanning, and calculating the ratio of the double echo signals in each scanning according to the intensity of the echo signals; according to the ratio of the double echo signals of each scanning, inverting an actual flip angle under the radio frequency power of each scanning; and obtaining a radio frequency power-flip angle mapping function according to the actual flip angle under the radio frequency power scanned for multiple times. According to the method, the radio frequency power and flip angle mapping function can be quickly obtained on the premise that image acquisition and reconstruction are not carried out, so that quick, low-cost and full-power-range radio frequency response calibration is realized.

Disclosed is a method for measuring critical condensate saturation pressure and critical condensate saturation of condensate gas by combining one-dimensional and two-dimensional nuclear magnetic resonance techniques, which solves low measurement precision and complex test method. The present invention detects signal intensity of the hydrogen-containing fluid in a rock core by combining a one-dimensional nuclear magnetic resonance T2 spectrum testing technology and a two-dimensional nuclear magnetic resonance T1-T2 spectrum testing technology, achieves the optimization of an artificial zoning method by an improved difference spectroscopy method to reduce errors, greatly improves condensate signal identification precision, and more quickly and accurately measures the critical condensate saturation pressure and the critical condensate saturation. Therefore, the flow law of condensate oil and gas two-phases in a formation is better studied, a more reasonable development plan is favorably formulated by a gas reservoir, and theoretical guidance is provided for improving condensate recovery ratio.

The invention discloses a method for testing a polyethylene macromolecular chain structure based on a solid nuclear magnetic resonance technology, and belongs to the field of macromolecular material characterization. The method comprises the following steps: firstly, putting a dried and crushed polyethylene sample into a nuclear magnetic rotor, and putting the nuclear magnetic rotor into a solid nuclear magnetic resonance spectrometer under a static condition; the method comprises the following steps: selectively exciting a hydrogen nucleus in a sample by adopting a double-quantum filtering pulse sequence, and collecting an H nuclear magnetic signal by setting parameters such as specific evolution time; and finally, carrying out peak shape analysis on the obtained solid H nuclear magnetic resonance spectrogram, distinguishing a crystalline region signal from an amorphous region signal, and quantitatively characterizing the motion limitation degree of the polyethylene chain segment according to an intensity ratio. The method does not need sample rotation or complex pretreatment, can quickly and accurately distinguish and quantify the crystalline region chain segment and the amorphous region chain segment in polyethylene, and provides an effective means for researching the relationship between the microstructure and the performance of a polyethylene material.

A system and method for deriving information on disease in vascular segments for example mean pressure, drop in mean pressure and / or hydraulic resistance, from such measured waveforms is described. The waveforms can, for example, be measured non-invasively using Doppler ultrasound or magnetic resonance techniques. Form Factors (Vff, Pff) for the velocity waveform and the central arterial pressure are determined. Lesions may be detected and located using the estimated non-invasive hemodynamic information

The present application relates to the field of nuclear magnetic resonance technology, and aims to solve the problem of how to improve the utilization rate of refrigerant and reduce consumption, and provides a probe and cooling circulation system for nuclear magnetic resonance. The probe for nuclear magnetic resonance includes a signal detection component and a cooling component. The signal detection component is used to detect nuclear magnetic resonance signals. The cooling component includes a capillary evaporator, a working fluid circulation pipeline and a JT throttle. The capillary evaporator is fitted with the signal detection component to cool the signal detection component. One end of the working fluid circulation pipeline is connected to the inlet end of the capillary evaporator, and the other end is connected to the outlet end of the capillary evaporator. The JT throttle is arranged at a position of the working fluid circulation pipeline close to the inlet end of the capillary evaporator. The JT throttle is used to reduce the pressure of the working fluid at the inlet end of the capillary evaporator to further cool the working fluid, which is conducive to the working fluid quickly cooling the signal detection component, so as to achieve the effect of improving the utilization rate of the refrigerant and reducing consumption.

The invention is suitable for the technical field of magnetic resonance, and provides a protocol parameter determination method and magnetic resonance equipment, and the method comprises the steps: obtaining a pre-scanning protocol, and determining the type of the pre-scanning protocol; a pre-scanning protocol is executed on the detection object, a plurality of pre-scanning images are obtained, and each pre-scanning image corresponds to different protocol parameters; according to the type and a pre-stored corresponding relation between different types and different feature recognition algorithms, a feature recognition algorithm corresponding to the pre-scanning protocol is flexibly determined; performing feature recognition on the plurality of pre-scanned images in a targeted manner according to a feature recognition algorithm so as to determine target parameters of the target protocol; and performing magnetic resonance scanning on the detection object according to the parameters of the target protocol. According to the method provided by the invention, manual intervention is not needed, the feature recognition algorithm corresponding to the pre-scanning protocol can be flexibly determined in combination with the type of the pre-scanning protocol, and the determination accuracy of the protocol parameters is improved.

The invention relates to the technical field of nuclear magnetic resonance, in particular to a radio frequency transceiver circuit, a magnetic resonance coil array and magnetic resonance coil equipment. The radio frequency transceiver circuit includes: a first node connected to a coil unit having a first resonant frequency; the second node is connected to the first node through a radio frequency transmitting branch and is connected to the radio frequency power divider; the third node is connected to the pre-amplifier; the radio frequency transmitting branch comprises a first diode connected between the second node and the first node; a bias voltage input node connected to the anode of the first diode via a second inductor and a first node, the self-resonance of the second inductor being at a first resonant frequency; the first capacitor is connected with the first diode in parallel; the second capacitor and the third inductor are connected in series and connected to the two ends of the first capacitor in parallel; and the first diode, the first capacitor, the second capacitor and the third inductor in the cut-off state form a resonance blocking circuit which resonates at a first resonance frequency.

The present invention relates to the field of magnetic resonance technology, and more specifically, to a structure for a transmitting coil for a magnetic resonance imaging system. The transmitting coil structure comprises a transmitting coil housing, characterized in that the housing comprises a plurality of through-holes, a printed circuit board is disposed within the transmitting coil housing, and a plurality of electronic components are disposed on the outer wall of the printed circuit board. The printed circuit board extends through the transmitting coil housing via the electronic components and is connected to the transmitting coil housing. Compared to the prior art, the structure of the transmitting coil is modified and the thickness of the transmitting coil is reduced, thereby reducing the room temperature aperture of the superconducting magnet, thereby reducing the size of the superconducting magnet and conserving superconducting wire, liquid helium, and steel.

The present application discloses a method for evaluating the wettability of reservoir rocks. By using two rock samples with the same physical properties to spontaneously imbibe oil-phase fluid and water-phase fluid respectively to simulate the processes of oil imbibition and water imbibition, and combining nuclear magnetic resonance technology to characterize the variation law and distribution law of fluid signals during the processes of oil-phase fluid and water-phase fluid imbibition in unconventional tight reservoir samples. Determine the pore size distribution of the reservoir rock pores according to the nuclear magnetic resonance data, and then calculate the different imbibition characteristic data of the pores with different pore size distributions in the rock for oil and water. Finally, calculate the wetting kinetic rate coefficient of the rock under different pore size distribution conditions, and use this to judge the wettability of the rock. While realizing the quantitative measurement of the wettability of reservoir rocks with different pore sizes, the measurement time period is greatly shortened.

The disclosure relates to a system and a method of analysing a physiological condition in an analyte. In particular, the disclosure pertains to systems, components of such systems, and methods of analysing a physiological condition in an analyte using hyperpolarization (HP) and magnetic resonance (MR) techniques.

The present invention provides a permanent magnet magnetic resonance imaging processing system and an electronic device, belonging to the field of magnetic resonance technology, comprising: a magnetic resonance machine and an imaging processing platform; the magnetic resonance machine is provided with an imaging body and a data processing device, a magnet is installed on the upper part of the imaging body, a workbench is slidably connected to the imaging body, an imaging area is arranged inside the workbench, and a radio frequency coil is arranged in the imaging area; the data processing device is connected to the radio frequency coil to obtain radio frequency signals and convert them into magnetic resonance images; the imaging processing platform is communicatively connected to the data processing device to obtain the magnetic resonance images as the magnetic resonance images to be analyzed, and perform identification, storage and display. By performing multi-dimensional index analysis on the magnetic resonance images, the characteristics of the magnetic resonance images can be accurately described. The system displays the index analysis results to the user in the form of intuitive charts, images, etc., enabling the user to understand and interpret the analysis results.

In a method for the improved recording of measurement data of an examination object, a desired imaging parameter and a desired flip angle are loaded for the recording of the measurement data by means of a recording method, the gradient to be switched for the position encoding of the measurement data having its total intensity during the incidence of an RF excitation pulse. A quantized value of an expected disturbance for the recording method is determined based on the desired imaging parameter, and a check of the performability of the correction of the disturbance is performed based on the quantized value and based on the desired flip angle.