25 results about "Radiofrequency coil" patented technology

Systems and methods are provided for a graphical user interface (GUI) for a magnetic resonance imaging (MRI) system. In an example, a system includes a display device; one or more processors; and memory storing instructions executable by the one or more processors to: determine a connection status for each of a plurality of ports, each port of the plurality of ports configured to couple a radiofrequency (RF) coil to an MRI apparatus; generate a GUI that includes a port status indicator for each port, each port status indicator having a visual appearance that is based on that port's connection status; and output the GUI for display on the display device.

To provide an RF coil array capable of obtaining relatively high sensitivity in subjects of various sizes.SOLUTION: An RF coil array according to the present disclosure includes a first coil unit including a first securing belt made of a first stretch material stretchable in a first direction and a plurality of RF coils disposed independently on the first securing belt, and a second coil unit including a second securing belt made of a second stretch material stretchable in the first direction and a plurality of RF coils disposed independently on the second securing belt. The first coil unit is attached to the subject with the distal end of the first fixing belt directed from one side to the other side in the first direction of the subject, and the second coil unit is attached to the subject with the distal end of the second fixing belt directed from the other side to the one side in the first direction of the subject such that at least a part of the second fixing belt overlaps the first coil unit.SELECTED DRAWING: Figure 7

Described herein are compact MRI systems having (i) an open, field-cycling magnet configured to produce and cycle between a first and second non-uniform B0 different from the first non-uniform B0, and (ii) a second component configured to produce a nonlinear spatial encoding gradient. Importantly, the open, field-cycling magnet and the spatial encoding gradients are customized to a specific imaging application. In particular, the second component contains one or several nonlinear DC gradient coils for spatial encoding. It also contains one or several a radiofrequency coils geometrically configured to have a non-planar configuration. Lastly, both the RF coils and DC encoding gradients are tailored specifically to the first non-uniform B0 magnetic field, the second non-uniform B0 magnetic field, or both. Artificial intelligence models trained to read imaging data can be incorporated as a component of the MRI systems. Also described are methods of using the disclosed MRI systems.

A high-frequency coil device can maintain a distance between coils at any mounting position in an RF coil including a movable coil unit and can achieve a uniform sensitivity distribution and high sensitivity. A first coil unit configured to move along a substantially circular trajectory and a second coil unit fixed within the substantially circular trajectory are provided, the first coil unit and the second coil unit are disposed at substantially point-symmetric positions, and magnetic coupling between conductor loops provided in both the coil units is maintained substantially constant in a movable range of the first coil unit.

Various systems and methods for magnetic resonance imaging are provided. In one aspect, a method for magnetic resonance imaging may include receiving a k-space data set acquired by a radio frequency (RF) coil. Each of the k-space datasets may correspond to a different one of the RF coils. Each of the k-space data sets may be truncated and / or undersampled. The method may further include generating a local image of the field of view based on the k-space data set and generating an initial image based on the local image. The initial image may be a full view of the field of view. The method may further include applying an iterative image reconstruction technique to generate an updated image based on the initial image.

Embodiments of the present disclosure provide a magnetic resonance device and a radiofrequency coil thereof. The radiofrequency coil includes at least one coil portion. Each of the at least one coil portion includes one or more flexible protective layers and one or more flexible coil units. The one or more flexible coil units are disposed on the one or more flexible protective layers and used to receive a magnetic resonance (MR) signal of an object. The at least one coil portion includes a first array and a second array, the first array being configured to be disposed about a first part of the object with a first curvature, the second array being configured to be disposed about a second part of the object with a second curvature, or form a hyperbolic surface structure.

A testing unit for the non-destructive testing of an electrically conductive and / or ferromagnetic workpiece comprises at least one magnetizing coil (1) and at least one RF coil (2), wherein the magnetizing coil (1) is configured to generate a static or quasi-static magnetic field. The RF coil, acting as a transmitting coil (4), is configured to generate an alternating magnetic field oriented perpendicular to the static or quasi-static magnetic field, wherein the RF coil (2) and the magnetizing coil (1) can be arranged one above the other in a direction perpendicular to the surface of the workpiece.This allows an acoustic transmission signal to be generated by superimposing the signals of the transmitting coil (4) and the signals of the magnetizing coil (1) and to be introduced into the workpiece in a measuring position (3), wherein the RF coil (2) is designed as a receiving coil (5) to receive an acoustic response signal in the measuring position (3).

An NMR probe head (10'), designed for insertion into an MR apparatus (101), comprising a probe head housing (4) for receiving a cylindrical temperature control tube (2) made of thermally conductive material surrounding a sample (5), a heat exchanger (1) being mounted at the axial end of which is in thermal contact with the temperature control tube and projecting radially from the latter onto the inner wall of the probe head housing, and a first insulation element (3) made of poorly thermally conductive material surrounding the temperature control tube at an axial distance from the heat exchanger and comprising an RF coil (6), is characterized in that at least one temperature control element (7) made of thermally conductive material is positioned radially between the first insulation element and the inner wall of the probe head housing for heat distribution along the z-axis.which completely surrounds the first insulation element azimuthally and extends axially along the z-axis at least over the full axial length of the first insulation element. This minimizes the temperature gradient across the sample in both axial and radial directions.

Described herein are compact breast MRI systems having (i) an open, field-cycling magnet configured to produce and cycle between a first and second non-uniform B0 different from the first non-uniform B0, and (ii) a second component configured to produce a nonlinear spatial encoding gradient. Importantly, the open, field-cycling magnet and the spatial encoding gradients are customized to a specific imaging application. In particular, the second component contains one or several nonlinear DC gradient coils for spatial encoding. It also contains one or several a radiofrequency coils geometrically configured to have a non-planar configuration. Lastly, both the RF coils and DC encoding gradients are tailored specifically to the first non-uniform B0 magnetic field, the second non-uniform B0 magnetic field, or both. Artificial intelligence models trained to read imaging data can be incorporated as a component of the MRI systems. Also described are methods of using the disclosed breast MRI systems.

The objective is to provide an RF coil device, which can be attached to a subject used in an environment with a magnetic field, that allows for position adjustment while the subject is moved inside the mounting device. [Solution] The RF coil device of the embodiment is an RF coil device that receives electromagnetic waves emitted from a subject in response to an RF pulse irradiated onto the subject under the influence of a magnetic field, and comprises a plurality of RF coil elements, a holding mechanism, and an outer casing. The plurality of RF coil elements are arranged in a planar manner. A non-conductive fluid flows into or out of the holding mechanism from a fluid path. The outer casing houses the plurality of RF coil elements and the holding mechanism. Each of the RF coil elements is positioned on the surface of the outer casing on the side that the outer casing contacts the subject, and the holding mechanism is positioned on the surface of the outer casing on the side opposite to the side that the outer casing contacts the subject.

A current sensing system for a magnetic resonance imaging (MRI) scanner operating at 1H and 31P resonant frequencies includes a dual-tuned RF coil with a network of up to two parallel quarter-wavelength transmission lines, each integrated with a PIN diode-coupled shunt capacitor. A multiple half-wavelength transmission line is employed with a corresponding pair of shunt capacitors and PIN diodes. A quarter-wavelength transmission line, coupled with a power amplifier through a matching network of shunt capacitors and PIN diodes, is also included. The configuration parameters are designed to tune the system to the fundamental frequency and its first odd multiple, correlating with the 1H resonant frequency, and to the 31P resonant frequency. The system accurately senses coil currents by detecting voltage variations in the matching network, thereby facilitating precise current measurements at the tuned resonant frequencies without the need for external sensors.

A technique is provided for determining a position of a coil element of a radiofrequency coil (RF) for placement into a patient placement region of a magnetic resonance (MR) apparatus. A magnetic resonance sequence is output via a radiofrequency (RF) antenna, which is arranged inside a scanner unit of the MR apparatus, first MR data is captured via the RF antenna, and second MR data is captured via the coil element. First MR images are ascertained from the first MR data, and second MR images are ascertained from the first MR data and the second MR data. Moreover, a similarity measure is determined from the first MR images and the second MR images, and an effective range of the coil element is determined from the first MR images and the second MR images. The effective range comprises a position of the coil element of the RF coil.

Magnetic resonance examination system (1) comprising: a main body (2) comprising a transmitting coil system (3); an optical receiver (4) for receiving an optical freespace signal; a local coil device (6) comprising: a detection RF coil (7) for detecting an MR signal, a signal processing unit (8) configured to receive the MR signal, which is analog, and to transmit a corresponding signal, which comprises the MR signal in an analog form, to an optical emitter (9), the optical emitter (9), which is configured for transmitting the corresponding signal by an optical freespace link (5) to the optical receiver (4). Further a corresponding method is described.

The present disclosure provides an apparatus for inducing a nuclear magnetic resonance. Further, the apparatus may include a magnetic unit which may be configured for generating a static magnetic field. Further, the static magnetic field may be characterized by a magnetic field characteristic. Further, the apparatus may include a radiofrequency coil unit which may be configured for generating a radiofrequency pulse. Further, the radiofrequency pulse may be characterized by a radiofrequency characteristic. Further, the static magnetic field and the radiofrequency pulse may be configured to induce the nuclear magnetic resonance in a user's body. Further, the apparatus may include a controlling unit communicatively coupled with each of the magnetic unit and the radiofrequency coil unit. Further, the controlling unit may be configured for controlling one or more of the magnetic field characteristic and the radiofrequency characteristic to create a therapeutic effect in the user's body.

A magnetic resonance imaging (MRI) system can include a gapped degenerate birdcage magnetic resonance imaging (MRI) radio frequency (RF) coil. The gapped degenerate birdcage MRI RF coil is tuned to a degenerate mode and comprises a row of RF coil elements and a mechanical gap. The RF coil elements may also be referred to as channels or meshes. The row extends circumferentially around an axis of a cylindrical-like former, and mechanical gap separates a pair of directly neighboring RF coil elements in the row. A transformer, a partial overlap, or the like minimizes inductive coupling between the pair of directly neighboring RF coil elements.

A system for magnetic resonance imaging includes a magnetic resonance imaging device, and a control unit configured to control the magnetic resonance imaging device. The magnetic resonance imaging device includes a magnetic resonance bore, a movable table configured to be movable in and out of the magnetic resonance bore, and at least two coil elements of at least one coil. The at least two coil elements are adjacently positioned with relative overlap (R) to each other on the movable table. The at least one coil includes an outer cover and an inner core, which is configured to slide laterally in two dimensions within the outer cover. The control unit includes a coil element detecting unit, an overlap detecting unit, a determining unit, and a position adapting unit.

The present disclosure provides various systems and methods for magnetic resonance imaging. In one aspect, a method for magnetic resonance imaging can include receiving k-space data sets acquired by radiofrequency (RF) coils. Each of the k-space data sets can correspond to a different one of the RF coils. Each of the k-space data sets can be truncated and / or under sampled. The method can further include generating partial images of a field of view based on the k-space data sets and generating an initial image based on the partial images. The initial image can be full image of the field of view. The method can further include applying an iterative image reconstruction technique to generate an updated image based on the initial image.

A method of operating a magnetic resonance imaging (MRI) system includes configuring the system to receive an input indicative of time intervals to be used for imaging a target object; controlling the one or more RF coils to apply a first order of modules including at least a first control module at a first time point and a first labeling module at a second time point to a target object, controlling the one or more RF coils to operate a second order of modules including at least a second labeling module at a third time point and a second control module at a fourth time point to the target object, wherein all the four modules invert the magnetization of the target object to suppress the MRI signal.

To suppress the decrease in linearity caused by temperature fluctuations in the amplification device without providing a high-power isolator between the amplification device and the RF coil. [Solution] One embodiment of the magnetic resonance imaging apparatus comprises an amplification device and an RF coil. The amplification device amplifies a high-frequency input signal and outputs it as an output signal. The RF coil applies the output signal to the subject. The amplification device comprises an amplification circuit and a control circuit. The amplification circuit has an amplification element that amplifies the input signal. The control circuit acquires pulse sequence information, which is information about the pulse sequence performed in this scan, estimates the junction temperature of the amplification element based on the pulse sequence information, calculates a linearity compensation value based on the junction temperature to compensate for the linearity of the output signal, and compensates the linearity of the output signal for each input signal based on the linearity compensation value corresponding to the junction temperature.

A magnetic resonance imaging apparatus according to an embodiment includes a static magnetic field magnet, an amplifier circuit, a phase control circuit, and an RF coil. The static magnetic field magnet is configured to generate a static magnetic field in a bore. The amplifier circuit is configured to amplify an input signal. The phase control circuit is configured to control a phase of a signal amplified by the amplifier circuit on a basis of gain of the amplifier circuit obtained from a signal inputted to the amplifier circuit and a signal amplified by the amplifier circuit, and on a basis of a reference gain. The RF coil is configured to transmit, to a subject placed in the bore, an RF pulse based on a signal amplified by the amplifier circuit and whose phase is controlled by the phase control circuit.

An NMR probe head (1) for performing high-resolution, liquid-state DNP-NMR comprises a corrugated waveguide (3) for mw transmission, arranged along a longitudinal axis Z of the probe head; a system of at least two of mw reflecting mirrors (4-7) for mw beam transmission, focusing and reshaping the beam to match for a sample geometry; at least one RF coil (11,12) for NMR detection mounted in a way to allow mw passage to the sample area, characterized by a cooling system comprising a flow dewar tube (8) for feeding cryogenic fluid mounted at the side of the probe head and parallel to the corrugated waveguide and a thermally isolated sample chamber (26) surrounded by a chamber dewar (9); a sample spinning arrangement being configured to achieve uniform irradiation over a sample volume, to increase the sample volume under mw irradiation, and to reduce sample heating; a sample assembly (13) comprising concentric circular tubes or rods (15, 16) forming constraints for a sample layer (14). This arrangement is capable of exciting in particular even large sample volumes up to ~40 μL.

An NMR-DNP probe head comprises a probe holder for receiving a sample vessel containing a sample substance surrounded by an RF coil, a temperature control device for maintaining the temperature of the sample substance, a microwave guide for supplying microwave radiation into the sample volume, and an illumination device comprising an optical fiber for photoinduced electron excitation of the sample substance in the sample volume. The temperature control device comprises a VT channel through which temperature control fluid can be supplied to the sample vessel during NMR measurement to maintain the temperature of the sample substance, the sample-side end of the optical fiber is arranged in the VT channel, and a deflecting mirror is arranged in the VT channel between the sample-side end of the optical fiber and the sample vessel that directs light exiting the optical fiber onto the sample substance in the sample volume of the sample vessel.

In one embodiment, An MRI apparatus comprising: an RF coil that includes a plurality of coil elements and can be installed in an arbitrary orientation with either a front surface or back surface brought into contact with the object; a table on which the object is placed; and processing circuitry configured to acquire an MR “Magnetic Resonance” signal in a first scan along any one axis from each of a plurality of representative coils selected from the plurality of coil elements, detect respective positions of the plurality of representative coils along the one axis based on MR signals, and determine disposition of the RF coil relative to the table based on the respective positions of the plurality of representative coils.

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.

The present application provides a method for improving plasma distribution in etching, the RF coil is a circular coil composed of four arcs, and the four arcs are sequentially defined as first to fourth arcs; providing a cross support, wherein heads and tails of the first to fourth arcs are separately connected to the cross support; respectively applying different currents to the first to fourth arcs, which are sequentially first to fourth currents, so that different magnetic fields are formed respectively in areas enclosed by the first to fourth arcs and the cross support connected thereto, wherein the magnetic fields corresponding to the first to fourth currents are sequentially first to fourth magnetic fields; and adjusting the magnitudes of the first to fourth currents to change the first to fourth magnetic fields, thereby changing plasma distribution in the different areas.