12 results about "Ultra low field" patented technology

The invention relates to the technical field of ultra-low field magnetic resonance systems, in particular to a battery charge state detection method and system based on closed-loop adaptive ultra-low field MRI, and the method comprises the steps: collecting the phase change of a water molecule H signal caused by the magnetic field disturbance of a to-be-detected battery, and reconstructing a first signal phase image; extracting to obtain a high-information-content area mask, and then performing resampling to obtain a second signal phase image; and inputting the second signal phase image into a state-of-charge detection model to predict a state-of-charge value of the to-be-detected battery. In order to solve the problem that a battery magnetic resonance detection scheme in the prior art needs to adopt a high-field magnetic resonance system and is not beneficial to production line use, detection equipment is replaced with an ultralow-field magnetic resonance system, so that structures such as a shielding room in a traditional magnetic resonance system are omitted, and a high-information-content area is positioned firstly, so that the detection efficiency is improved; and resampling is carried out on the region, so that the imaging precision is improved, and the accuracy of state of charge estimation of the detection model is improved.

The system comprises a magnet unit, an equipment cabinet and an operation transfer bed, the magnet unit is composed of a permanent magnet, a gradient coil and a radio frequency coil, the permanent magnet is of a U-shaped structure, a scanning area with the front face of a patient being completely open is formed, and the gradient coil and the radio frequency coil are arranged in the scanning area. The gradient coil is embedded into the inner side of the magnet to generate a space gradient field, and the radio frequency coil is arranged around the forehead, the head side face and the rear pillow area of a patient to avoid blocking the eyes, the mouth and the nose. The equipment cabinet is arranged below or beside the magnet unit, a gradient power amplifier, a radio frequency power amplifier, a front receiving unit, a spectrometer, a power supply control unit and a rechargeable battery are arranged in the equipment cabinet, and all the modules are electrically connected to form an imaging control system. The surgical transfer bed is slidably connected to the magnet unit for feeding the head of the patient into the imaging area. The system realizes full-open scanning in an ultra-low field environment, is suitable for intraoperative and postoperative monitoring and special patient image examination, and remarkably improves safety, comfort and operability.

An ultra-low field magnetic resonance imaging system and a method thereof are provided. The ultra-low field magnetic resonance imaging system includes means for collecting a down-sampled three-dimensional ultra-low field magnetic resonance data; means for processing a three-dimensional ultra-low field magnetic resonance data to obtain a three-dimensional isotropic ultra-low field magnetic resonance image; and means for processing data, for inputting the three-dimensional isotropic ultra-low field magnetic resonance image into a pre-trained image enhancement model to obtain a full-sampled three-dimensional magnetic resonance enhanced image.

The invention provides an ultra-low field magnetic resonance imaging integrated circular polarization radio frequency transmit-receive coil, and relates to the ultra-low field magnetic resonance imaging technology, the ultra-low field magnetic resonance imaging integrated circular polarization radio frequency transmit-receive coil comprises a medium substrate, split copper sheet ring structures and split straight copper sheet structures, the medium substrate is a cylindrical structure, the medium substrate is uniformly provided with multiple groups of split copper sheet ring structures, and the split straight copper sheet structures are arranged on the medium substrate. The split straight copper sheet structures are vertically and uniformly arranged on the split copper sheet ring structures, and feed ports are formed in the split copper sheet ring structures and connected with coaxial cables through SMA connectors. According to the invention, the transmitting and receiving of the circularly polarized magnetic field are realized through orthogonal feed and the adjustable element, the circularly polarized magnetic field can obviously improve the received signal strength and realize the effective improvement of the signal-to-noise ratio, the parameterized design is adopted, the flexible adaptation of multiple scenes is supported, and the antenna can be applied to different field strengths by adjusting the parameters of the adjustable capacitor, the adjustable resistor and the like. And the application scene is widened.

A system of field cycled magnetic resonance system and a method of operating a field cycled magnetic resonance system are described. In accordance with various embodiments, the disclosed system includes a static field magnet, wherein the magnet is configured to provide a low static external magnetic field to a given field of view, a radio frequency coil, and a field cycling magnet. In accordance with various embodiments, the method includes providing a static field magnet configured to image a tissue sample within a given field of view, applying a low static external magnetic field to the given field of view, providing a radio frequency coil configured to produce cycling radio frequency field, providing a field cycling magnet, altering the low static external magnetic field within the given field of view, and collecting images from the system.

The application relates to an ultra-low-field magnetic resonance imaging noise suppression method and an ultra-low-field magnetic resonance imaging system. The method comprises the following steps: acquiring original magnetic resonance signals of a main imaging signal channel and reference noise signals of a plurality of reference channels; dividing time periods according to a scanning sequence and generating synchronization control signals corresponding to different time periods; in response to a first synchronization control signal, entering a training mode in a non-signal acquisition window of the scanning sequence, wherein the training mode comprises updating weight coefficients of an adaptive filter set based on the reference noise signals and the original magnetic resonance signals; in response to a second synchronization control signal, entering a scanning mode in a signal acquisition window of the scanning sequence, wherein the scanning mode comprises freezing or reducing the update speed of the weight coefficients of the adaptive filter set, and using the updated weight coefficients to perform noise cancellation on the original magnetic resonance signals and output purified magnetic resonance signals. The image signal-to-noise ratio of the ultra-low-field magnetic resonance imaging is improved.

The present disclosure provides systems and methods for deep learning super-resolution training and / or image generation for low and ultra-low field magnetic resonance imaging. In some aspects, a method includes obtaining a first image of a brain with a low field strength magnetic resonance imaging system. The first image has a first resolution. The method further includes obtaining a deep learning brain model based on a high field strength image. The deep learning brain model can be configured to be applied by a neural network comprising a plurality of layers. The method further includes applying the deep learning brain model to the first image to generate a second image of the brain. The second image has a second resolution, and the second resolution is greater than the first resolution.

The invention discloses a method and a device for identifying and eliminating low-frequency strong interference noise of a magnetic resonance system, which are characterized in that after being processed by a conventional self-adaptive noise reduction method, signals in a k space which is not influenced by low-frequency strong EMI (Electro-Magnetic Interference) along frequency and phase encoding directions are smooth, and the low-frequency strong EMI is discontinuous in the phase encoding direction, so that the low-frequency strong interference noise can be identified and eliminated. According to the characteristic that the signal is in a peak shape in time sequence, low-frequency strong EMI post-processing identification and elimination are carried out on the signal after self-adaptive noise reduction; therefore, the low-frequency strong interference noise in the nuclear magnetic resonance signal can be removed, so that the quality of nuclear magnetic resonance imaging is improved; therefore, the method is very suitable for large-scale application and popularization in the field of ultra-low field nuclear magnetic resonance.

A system of field cycled magnetic resonance system and a method of operating a field cycled magnetic resonance system are described. In accordance with various embodiments, the disclosed system includes a static field magnet, wherein the magnet is configured to provide a low static external magnetic field to a given field of view, a radio frequency coil, and a field cycling magnet. In accordance with various embodiments, the method includes providing a static field mag-net configured to image a tissue sample within a given field of view, applying a low static external magnetic field to the given field of view, providing a radio frequency coil configured to produce cycling radio frequency field, providing a field cycling magnet, altering the low stat-ic external magnetic field within the given field of view, and collecting images from the system.

The present application relates to the technical field of ultra-low field magnetic resonance system, and particularly relates to a battery state of charge detection method and system based on closed-loop adaptive ultra-low field MRI, comprising: collecting the phase change of water molecule H signal caused by the magnetic field disturbance of the battery to be detected to reconstruct a first signal phase image; extracting a high-information-area mask, then resampling to obtain a second signal phase image; inputting the second signal phase image into a state of charge detection model to predict the state of charge value of the battery to be detected. The battery magnetic resonance detection scheme in the prior art needs to use a high-field magnetic resonance system, which is not conducive to the use of the production line. The detection equipment is replaced with an ultra-low field magnetic resonance system, so that the shielding room and other structures in the traditional magnetic resonance system are omitted, and the imaging accuracy is improved by first locating the high-information-area and then resampling the area, thereby improving the accuracy of the detection model in estimating the state of charge.

A field cycling magnetic resonance system and a method for operating a field cycling magnetic resonance system are described. According to various embodiments, the disclosed system includes a static field magnet, wherein the magnet is configured to provide a low static external magnetic field to a given field of view, a radio frequency coil, and a field cycling magnet. According to various embodiments, the method includes providing a static field magnet configured to image a tissue sample within a given field of view, applying a low static external magnetic field to the given field of view, providing a radio frequency coil configured to produce a cycling radio frequency field, providing a field cycling magnet, varying the low static external magnetic field within the given field of view, and collecting an image from the system.

The application relates to the technical field of low-field magnetic resonance imaging equipment, in particular to a novel magnet structure suitable for an ultra-low-field magnetic resonance imaging system, which comprises: a diffusion control array arranged outside a ring-shaped magnet steel array, the diffusion control array comprising at least two groups of diffusion control magnet steels arranged in a vertical direction; the magnetic directions of adjacent diffusion control magnet steels are opposite, so as to constitute multiple groups of inward magnetic force lines and constrain the main magnetic field. In view of the problem that the magnet structure design in the prior art needs to add components such as a shimming ring and a pole plate, so that eddy current is generated in the two components when the gradient coil is rapidly switched, the shimming ring and the pole plate and other structures in the traditional design are cancelled, the ring-shaped magnet steel array is adopted to generate a more concentrated magnetic field, and the diffusion control array arranged outside the ring-shaped magnet steel array is adopted to generate an inward magnetic field, so that the diffusion phenomenon of the main magnetic field is reduced, good imaging can still be realized under the condition that the shimming ring and the pole plate are cancelled, and the eddy current problem caused by the above structure is eliminated.