120 results about "Magnetic resonance technique" patented technology

An apparatus and a method is provided based on the Magnetic Resonance techniques to analyze and measure a uni- and/or a bi-directional flow regime of multiphase fluids in a transport and production conduct, in real time and flow-rates, based on a magnetic resonance analytical module, two magnetic prepolarization modules of variable effective length and a control computer of data acquisition and transfer, all associated to each other.

A magnetic resonance imaging "MRI" method and apparatus for lengthening the usable echo-train duration and reducing the power deposition for imaging is provided. The method explicitly considers the t1 and t2 relaxation times for the tissues of interest, and permits the desired image contrast to be incorporated into the tissue signal evolutions corresponding to the long echo train. The method provides a means to shorten image acquisition times and/or increase spatial resolution for widely-used spin-echo train magnetic resonance techniques, and enables high-field imaging within the safety guidelines established by the Food and Drug Administration for power deposition in human MRI.

The invention discloses a nuclear magnetic resonance imaging observing device and method in a coal rock crack development process. The device comprises a nuclear magnetic resonance imaging analyzer and a rock core vacuum saturation instrument; the method provides a low-field magnetic resonance technology, namely a special nuclear magnetic resonance imaging analyzer with the magnetic field strength of lower than 1.0 Tesla is used for carrying out imaging analysis on a distribution condition of inner cracks of a rock coal sample; the sample is subjected to vacuum saturation water treatment and an image for reflecting a distribution condition of a rock core porosity is formed by signals generated by water in sample pores; an image resolution is higher and a recovery degree to an inner structure of the sample is better; and the method not only can accurately recover a pore environment inside the sample, but also can analyze and research a development process of sample cracks by means of repeatedly testing.

The present invention relates to a device for detecting a non-authorized material in a zone with protected access, the device being characterized by the fact that it comprises in combination:

• • a supporting base (100) designed to receive a single foot wearing a shoe, of an individual to be inspected;
  • detector means (430, 450, 460) adapted to detect a target material by employing at least one magnetic resonance technique to detect said non-authorized material and associated with the support base (100); and
  • position-identifying means (400) on the support base (100) suitable for imposing accurate positioning of the foot of the individual being inspected relative to the detector means.

Using resonant interactions to directly and tomographically image neural activity in the human brain using magnetic resonance imaging (MRI) techniques at ultra-low field (ULF), the present inventors have established an approach that is sensitive to magnetic field distributions local to the spin population in cortex at the Larmor frequency of the measurement field. Because the Larmor frequency can be readily manipulated (through varying B_m), one can also envision using ULF-DNI to image the frequency distribution of the local fields in cortex. Such information, taken together with simultaneous acquisition of MEG and ULF-NMR signals, enables non-invasive exploration of the correlation between local fields induced by neural activity in cortex and more ‘distant’ measures of brain activity such as MEG and EEG.

A system and method for measuring fluid flow in a wellbore in an earth formation using time-of-flight (TOF) sensing and remote detection nuclear magnetic resonance (NMR) techniques, by applying a magnetic field to the formation to polarize spins present in a portion of the formation, providing an encoding shell in the formation, selecting an encoding volume from the encoding shell, applying an encoding signal to excite the spins in the encoding volume, introducing a time delay to the encoding signal, providing a detection shell in the formation, applying a detection signal to the detection shell, detecting an NMR signal generated by the migration of spins from the encoding shell to the detection shell, and collecting TOF data corresponding to time elapsed from when a spin is encoded to when the spin reaches the detection shell.

A magnetic resonance imaging “MRI” method and apparatus for lengthening the usable echo-train duration and reducing the power deposition for imaging is provided. The method explicitly considers the t1 and t2 relaxation times for the tissues of interest, and permits the desired image contrast to be incorporated into the tissue signal evolutions corresponding to the long echo train. The method provides a means to shorten image acquisition times and/or increase spatial resolution for widely-used spin-echo train magnetic resonance techniques, and enables high-field imaging within the safety guidelines established by the Food and Drug Administration for power deposition in human MRI.

The invention provides a method and system for labeling items, wherein the labels contain digital information and can be read when desired. The coding of the labels is done by choosing specifically engineered nano-particles, micro-particles, or liquid material in the form of “ink.” The particles are designed to contain materials with distinguishable NMR (nuclear magnetic resonance) or NQR (Nuclear quadrupole resonance) frequencies and are combined in sets to encode digital information. The NMR/NQR label particle sets are printed on the item to be labeled, or on a label substrate which is then attached to the item to be labeled. In one embodiment, the printed NMR/NQR label consists of an array of spots, each of which may encode one or more digital characters. These spots can be detected and the digital information in the label can be read using a suitable magnetic resonance detector.

The invention relates to the technical field of rock core oil washing effect evaluation, and in particular relates to a method for quantitatively evaluating the oil washing effect of a rock core by using a nuclear magnetic resonance (NMR) technology. The method comprises the following steps: (1) volatilizing an oil washing solvent and drying; (2) measuring gas porosity and gas void volume; (3) measuring the NMR T2 spectrum of the rock core and the NMR T2 spectrum of a standard sample; (4) obtaining residual oil volume; (5) obtaining residual oil porosity; and (6) obtaining residual oil saturation, thereby evaluating the oil washing effect of the rock core. According to the method, the time of a measurement process is short, and the efficiency of measurement is effectively improved; during measurement, the measurement is non-contact and non-destructive measurement, no damage to the rock core can be caused, and the measured rock core cannot affect the subsequent experiment measurement of the rock core; meanwhile, quantitative parameters, such as the porosity of the rock core, the residual oil volume, the residual oil porosity, the residual oil saturation and the NMR T2 spectrum of residual oil, can be simultaneously obtained, so that the applicable range is wide.

The invention discloses an imbibition device for spontaneous imbibition on-line monitoring in combination with a nuclear magnetic resonance technology. The device comprises a low-field nuclear magnetic resonance instrument; a non-magnetic imbibition assembly which comprises an imbibition cavity fixer, a non-magnetic imbibition cavity and a liquid level sensor, and the non-magnetic imbibition cavity is in threaded connection with the imbibition cavity fixer through a screw rod, is arranged in the low-field nuclear magnetic resonance instrument and is provided with the liquid level sensor and anelectric valve; a non-magnetic metal net is arranged in the non-magnetic imbibition cavity; a Markov bottle assembly which comprises a Markov bottle and an iron stand, and the Markov bottle is connected with the electric valve through a non-magnetic pipeline; and a computer control system which is in control connection with the low-field nuclear magnetic resonance spectrometer, the liquid level sensor and the electric valve and is connected with a nuclear magnetic spectrometer. The imbibition device can continuously obtain nuclear magnetism experiment data in the spontaneous imbibition process in real time in an online mode, reveals the migration characteristics of fluid in a rock core in the spontaneous imbibition process, optimizes the experiment process, and reduces experiment result errors.

The present disclosure provides various methods and systems for performing magnetic resonance studies. In accordance with many embodiments, image or other information of interest is derived from super radiant pulses.

The present disclosure provides various methods and systems for performing magnetic resonance studies. In accordance with many embodiments, image or other information of interest is derived from super radiant pulses.

The invention discloses a nuclear magnetic resonance petroleum transmission pipeline leakage hidden danger detecting instrument and detecting method, and belongs to the technical field of detection. According to the technical scheme, the nuclear magnetic resonance petroleum transmission pipeline leakage hidden danger detecting instrument comprises a detecting instrument body and a communication controller connected with the detecting instrument body, wherein the communication controller is connected with a transmitting/receiving control unit; the transmitting/receiving control unit comprises a transmitting/receiving controller, a transmitting circuit, a bridge circuit controller, a resonant capacitor, a transmitting coil, a power source and a signal collecting/receiving device; the signal collecting/receiving device is composed of first to Nth collecting units and first to Nth receiving coils corresponding to the first to Nth collecting units. The nuclear magnetic resonance petroleum transmission pipeline leakage hidden danger detecting instrument and detecting method have the advantages that the leakage position of a petroleum transmission pipeline can be directly measured through the nuclear magnetic resonance technology, the detecting precision is high, measurement is carried out many times, the signal to noise ratio of received signals is improved, an arch board and the petroleum transmission pipeline are matched to carry out detection, damage to the pipeline is reduced, the detection efficiency is high, and detection is convenient.

The present disclosure provides various methods and systems for performing magnetic resonance studies. In accordance with many embodiments, image or other information of interest is derived from super radiant pulses.

The present invention provides a method and system to reduce the problem of signal dropout in data acquired using gradient-echo and asymmetric spin-echo magnetic resonance techniques, caused by linear susceptibility gradients in the direction of slice-selection. Specifically an algorithm is used to determine the optimal parameters of a tailored radiofrequency pulse along with the accompanying slice-selection and slice-refocusing gradients to correct this signal dropout.

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 invention belongs to the technical field of petrochemical engineering, and discloses a representation method and a representation system of tight sandstone oil-water relative permeability information. Effective connection with a core holding unit device is realized through a nuclear magnetic resonance device, and a tight sandstone displacement of oil by water process under nuclear magnetic resonance device is completed; and heavy water is used for displacement of oil; an oil and water relative permeability curve is solved and drawn through signals in a T2 spectrum of detected n-dodecane and port discharged liquid quantity; then, the displacement of oil by water process in a stratum is analyzed comprehensively in combination with geological conditions. In the method provided by the invention, oil content and water content in the core are solved through the T2 spectrum, and the finally drawn oil and water relative permeability curve is more accurate than that drawn by other methods;in an experiment process, a nuclear magnetic resonance test can be executed at any stage, the core is free from being taken out, and an experiment result obtained meets actual conditions better; the method is more convenient to operate, the whole process of the displacement of oil by water can be highly represented through the nuclear magnetic resonance test, so the method has actual significancein development of tight oil.

Techniques include determining, non-invasively and without applying deformational stress, a nuclear magnetic resonance relaxation rate at a volume inside a subject. The method also includes determining a mechanical property of material at the volume inside the subject based on the nuclear magnetic resonance relaxation rate.

The invention discloses a nanometer material for magnetic resonance imaging and/or photo-thermal treatment and a preparation method thereof and belongs to the field of diagnosis and treatment integration of photo-thermal treatment mediated by the magnetic resonance imaging. The preparation method for the nanometer material comprises the following steps: partially oxidizing catechol into semiquinone or quinone with high activity under the effect of cupric ions under the heating condition of dopamine modified gadolinium compound and dopamine modified polyethylene glycol in an aqueous medium, and then agglomerating the product, thereby acquiring the nanometer material. According to the invention, a micromolecular gadolinium contrast agent is transformed into a macromolecular gadolinium contrast agent through oxidative coupling reaction; the macromolecular gadolinium contrast agent has the advantages of high relaxation efficiency, long in vivo cycling time, low targeting and toxic or side effect, and the like; the nanometer material prepared according to the invention has higher photo-thermal conversion efficiency in a near-infrared area and can be used as a photo-thermal treatment agent in the photo-thermal treatment; and a magnetic resonance technique can be utilized to confirm the position and size of the tumor and the enrichment condition of the photo-thermal treatment agent in the tumor tissue and can be used for evaluating the treatment effect.

The present disclosure provides various methods and systems for performing magnetic resonance studies. In accordance with many embodiments, image or other information of interest is derived from super radiant pulses.

In a method for acquisition of a measurement data set of a respirating examination subject by magnetic resonance technology, the measurement data set is acquired by numerous individual measurements, wherein, for each individual measurement, a respiratory position and a respiratory phase are determined, based on which it is decided whether the individual measurement is to be included in the final measurement data set from which an image data set is reconstructed.

The present invention relates generally to the field of magnetic resonance imaging and, more particularly, to devices and methods used in the observation of the diffusion of molecules across a permeable membrane using magnetic resonance techniques. A typical embodiment of the invention is a method of observing the diffusion of a molecule in a container having a permeable membrane that is disposed between a first solution and a second solution in the container, by using magnetic resonance imaging to obtain an image of the diffusion of the molecule in the first solution across the membrane in to the second solution.

The application is suitable for the technical field of magnetic resonance, and provides a rapid magnetic resonance multi-parameter imaging method and device. The method comprises the steps: collectingN groups of data through a pulse sequence, and carrying out the reconstruction based on the N groups of data to obtain N images, setting the N to be an integer greater than or equal to 1; generatinga dictionary from the parameters of the pulse sequence, a spin-lattice relaxation time constant T1 and a spin-spin relaxation time constant T2 through a fractional order Bloch model; and matching thesignal sequences of the corresponding pixels on the N images with the entries in the dictionary, and determining final R tissue characteristic parameter graphs as the output of fingerprint imaging according to the matching degree. According to the application, the accuracy of magnetic resonance fingerprint quantitative imaging can be improved.