12 results about "Magnetic resonance technique" patented technology

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.

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.

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

This invention provides a method for quantifying supraspinatus muscle fat infiltration using magnetic resonance imaging (MRI). Belonging to the field of MRI technology, this invention involves performing IDEAL-IQ sequence scanning on the shoulder joint of a subject to acquire multi-echo complex raw three-dimensional matrix data. A three-dimensional tensor unsupervised low-rank sparse decomposition blind-source water-fat separation model is used to decouple the real tissue signal from the field distortion phase term in the signal algebraic structure. After manually delineating the region of interest (ROI) of the supraspinatus muscle at a standard research level, a multi-component super-resolution unmixing model based on microscopic magnetic susceptibility anisotropy correction is employed to perform sub-voxel-level partial volume effect correction on the boundary voxels. Finally, the results are combined with artificial intelligence and MRI morphological typing to calculate and output a quantitative assessment report of the supraspinatus muscle fat fraction. This invention solves the technical problem of insufficient quantitative accuracy of the supraspinatus muscle fat fraction caused by phase contamination and systematic interference from partial volume effects in the water-fat separation results under shoulder joint edge scanning conditions with highly non-uniform main magnetic fields.

The utility model relates to the technical field of nuclear magnetic resonance, and discloses a nuclear magnetic resonance chest and abdomen coil protection device which comprises a base, the top of the base is fixedly connected with a first installation seat, the top of the base is fixedly connected with a second installation seat, and the top of the first installation seat and the top of the second installation seat are each fixedly connected with two supporting columns. Damping oil is injected into the liquid storage cylinder, so that the soft clamping block is driven to clamp the nuclear magnetic resonance thoracic-abdominal coil shell, air in the soft clamping block is exhausted, and therefore the soft clamping block is adsorbed on the nuclear magnetic resonance thoracic-abdominal coil shell, and the nuclear magnetic resonance thoracic-abdominal coil shell is clamped. The position of the nuclear magnetic resonance thoracic-abdominal coil shell is limited by the damping oil in the liquid storage cylinder, and the damping oil in the liquid storage cylinder can absorb collision force transmitted from the outside, so that the situation that the coil is abraded due to the fact that the nuclear magnetic resonance thoracic-abdominal coil shell is collided is avoided, and normal use of a nuclear magnetic resonance imager is guaranteed.

The application discloses a kind of nuclear magnetic resonance pulse data's framing method, framing ware and nuclear magnetic resonance spectrometer, it is related to nuclear magnetic resonance technical field.Framing method includes: obtaining the nuclear magnetic resonance pulse data to be framed;Using fixed length coding mode, according to the data type of nuclear magnetic resonance pulse data to be framed, nuclear magnetic resonance pulse data to be framed is framed into independent event frame, or framed into the shaping envelope data frame different from event frame structure, wherein, event frame includes at least one of emission event frame, receiving event frame and delay event frame.Thereby, the FPGAs parsing complex, timing deviation problem caused by variable length framing in the prior art can be overcome, while solving the defect that envelope data cannot be reused and frame data volume is large caused by selective pulse envelope data and emission instruction mixed coding, so as to reduce the complexity of transceiver processing, improve the stability and flexibility of nuclear magnetic resonance detection.

The utility model relates to the technical field of nuclear magnetic resonance, in particular to a nuclear magnetic resonance integrated flexible head coil structure. An integrated flexible head coil structure comprises a base assembly, a face cover assembly, a head cover assembly and a head top support assembly, and is characterized in that the face cover assembly and the head cover assembly are arranged above the base assembly, the head top support assembly is arranged above the head cover assembly, and the head top support assembly is connected with the base assembly. Compared with the prior art, the nuclear magnetic resonance integrated flexible head coil structure has the advantages that the soft coil and the hard coil are combined, and the position of the head coil can be flexibly adjusted according to different head forms and face forms of each detected individual, so that the position of the head coil and the face coil is closer to the detected position, and the effect of clearer and more accurate nuclear magnetic imaging is achieved.

The invention belongs to the technical field of magnetic resonance, and particularly relates to a temporal-mandibular joint dynamic magnetic resonance radio frequency coil capable of adapting to different head types, which comprises a magnetic resonance machine body, a fixed coil and a movable coil, the multiple fixed coils are arranged on the outer side of an inner cavity of the magnetic resonance machine body in a surrounding mode. The multiple movable coils are arranged in an inner cavity of the magnetic resonance machine body in a surrounding mode and located on the inner rings of the multiple fixed coils. Each movable coil is positioned between two adjacent fixed coils; the plurality of movable coils can move towards the center of the magnetic resonance machine body through a pushing mechanism; the movable coil can be tightly attached to temporomandibular joints of different head types through dynamic adjustment, the signal sensitivity and the image signal-to-noise ratio are effectively improved, and fine structures such as a joint disc are displayed more clearly. The problem that the imaging quality is unstable due to the difference of the head shape and the face contour of the patient is solved, and the consistency and the accuracy of diagnosis are guaranteed.