13 results about "Birdcage coil" patented technology

A coil for single-sided magnetic resonance imaging is disclosed. The coil is configured to generate a magnetic field outwards away from the coil. The coil includes a first ring and a second ring having different diameters and the current flows through the coil to generate the magnetic field in a region of interest. A method of imaging via a magnetic imaging apparatus is also disclosed. The method includes providing a power source and providing a coil that includes a first ring and a second ring having different diameters. The method includes turning on the power source so as to flow a current through the coil to generate a magnetic field in a region of interest. The method also includes selectively turning on a particular set of electronic components so as to pulse the magnetic field in a narrower frequency range.

The application discloses a high-field animal magnetic resonance multi-nuclear radio frequency volume coil, a system and a control method, which comprises coaxially arranged outer and inner birdcage coils. A plurality of diodes are arranged on the end ring of the inner birdcage coil, and a direct current feeding node is arranged on the birdcage leg structure; the direct current feeding node and the diodes form a direct current control loop through the birdcage leg and the end ring, and are used for controlling the on-off of the diodes. When the outer coil works, a reverse bias voltage is applied to make all the diodes of the inner coil cut off, and when the inner coil works, a forward bias voltage is applied to make all the diodes conduct. The application utilizes the structure of the birdcage to construct a direct current control loop, does not need to additionally introduce a complex feeding network, realizes the complete on-off of the inner coil without increasing radio frequency loss, effectively eliminates the electromagnetic coupling between the double-layer coils, is compact in structure, and is particularly suitable for a small-aperture high-field animal magnetic resonance multi-nuclear imaging system.

The invention discloses a double-frequency birdcage radio frequency coil device, and relates to the field of magnetic resonance imaging coils. Comprising two symmetrically arranged end rings, a plurality of leg conductors are arranged between the two end rings, and each leg conductor comprises two supporting legs with the same width; according to different distribution states of capacitors on the end rings and the supporting legs, a band-pass mode, a high-pass-high-pass mode or a low-pass-low-pass dual-frequency mode can be set. According to the split-leg integrated dual-frequency band-pass birdcage coil, each leg conductor is divided into an independent capacitor branch, excitation / receiving can be carried out at 120 MHz and 298 MHz at the same time, no switch is needed, the isolation degree is high, and the inhomogeneity of two frequency points B1 is 1t; compared with the prior art, the method has the advantages that a matching network is omitted, so that the cost is reduced by 30%, the signal-to-noise ratio is obviously improved, and a parameterized model is verified to be directly expanded to a 7T system, so that the problems of cross interference, poor uniformity, complex structure and difficulty in expansion of a high field are solved at one time by a simple structure, and a reliable hardware platform is provided for multi-nuclide quantitative MRI (Magnetic Resonance Imaging).

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.

The invention discloses a passive auxiliary resonator, and relates to the technical field of medical instruments, the passive auxiliary resonator comprises a resonance cage structure, a slotted end cover and spacing field suppressors, one end of the resonance cage structure is connected with the slotted end cover, the other end of the resonance cage structure is open, and a plurality of spacing field suppressors are uniformly distributed along the circumferential direction of the resonance cage structure; the resonance cage structure is used for being arranged in a birdcage coil of nuclear magnetic resonance equipment in a sleeved mode, and the resonance cage structure is provided with different sizes and models according to the size of the cross sectional area. The passive auxiliary resonator in the embodiment is placed in a nuclear magnetic resonance cabin for use, the radio frequency magnetic field intensity in the resonator can be greatly enhanced, and then the nuclear magnetic resonance imaging resolution is improved; meanwhile, the radio frequency magnetic field in the resonator is uniformly distributed, so that the imaging quality in the cavity is kept consistent along with the position change; the whole structure does not need extra cable connection, and the size can be selected and used according to needs so as to adapt to nuclear magnetic resonance imaging enhancement of human body parts of different sizes.

This application discloses a birdcage coil for extremely high field magnetic resonance imaging and its uniformity evaluation structure, relating to the field of magnetic resonance imaging. The coil includes: two circular end rings, multiple parallel legs, and a PCB board. The two circular end rings are arranged opposite each other, and the multiple parallel legs are connected between the first and second circular end rings, thus forming a cylindrical birdcage structure. The PCB board is arranged along the birdcage structure. On the inner side of the PCB board, at the position of each parallel leg, a long strip of inner copper plating is provided along the extension direction of the leg. On the outer side of the PCB board, at both ends of each inner copper plating, a predetermined shape of outer copper plating is provided. Each pair of outer copper platings is not connected, and there is an overlap between the outer and inner copper platings, forming a distributed capacitance. A lumped capacitor is provided between each pair of adjacent outer copper platings, near the edge of the end ring. This application improves the signal-to-noise ratio of the birdcage coil.

The present disclosure relates to an apparatus for use with a Magnetic Resonance Imaging (MRI) system, in particular an RF coil 10 for use with a MRI system. 1. The RF coil 10 for a magnetic resonance (MR) imaging system, the RF coil 10 comprises a birdcage coil 104 comprising axially extending conductive rungs 102 circumferentially arranged between respective conductive end rings; and two or more dipole antennae 102 equiangularly positioned around the circumference of the birdcage coil 104 between at least a subset of the conductive rungs 102 of the birdcage coil 104, wherein the birdcage coil 104 and the two or more dipoles 102 are respectively tuned to operate at different RF frequencies, and together increase the homogeneity of a magnetic field across an imaging slice to be taken by the MR imaging device.

An apparatus for controlling electromagnetic (EM) radiation emitted from a magnetic resonance imaging (MRI) system having a magnet assembly having a superconducting magnet and a radio frequency (RF) shield includes an RF birdcage body coil positioned in the magnet assembly proximate to an inner radius of the RF shield and configured to apply one or more RF excitation pulses, at least one radiation control array positioned in the magnet assembly and configured to control EM radiation generated by the RF birdcage body coil during application of the one or more RF excitation pulses, and a processor device coupled to the RF birdcage coil and the at least one radiation control array and configured to control current waveforms provided to the RF birdcage body coil and to the at least one radiation control array.

A magnetic resonance multi-core radio frequency coil device includes a first birdcage coil and a second birdcage coil coaxially nested. The first birdcage coil includes four first end rings arranged along an axial direction and multiple first leg structures. Each first leg structure is connected to the four first end rings. The second birdcage coil includes two second end rings arranged along the axial direction and multiple second leg structures. Each second leg structure is connected to the two second end rings. The first birdcage coil is configured to transmit and receive radio frequency energy at frequencies corresponding to three different nuclides. The second birdcage coil is configured to transmit and receive radio frequency energy at a frequency corresponding to a nuclide. The nuclides corresponding to the first birdcage coil are different from the nuclide corresponding to the second birdcage coil.

The invention discloses a double-resonance transceiving separation device for magnetic resonance deuterium metabolism imaging, which comprises four supporting cylinders, the supporting cylinders are sequentially connected in a sleeving manner to form a layer structure, a radio frequency shielding layer supporting cylinder is arranged on the outermost layer, and a radio frequency shielding layer is arranged on the radio frequency shielding layer supporting cylinder; the 1H high-pass birdcage coil supporting cylinder is arranged on the second layer, and a 1H high-pass birdcage coil is arranged on the 1H high-pass birdcage coil supporting cylinder; a 2H saddle coil supporting cylinder is arranged on the third layer, and a 2H saddle coil is arranged on the 2H saddle coil supporting cylinder; the 2H double-array receiving coil supporting cylinder is arranged on the innermost layer, and a 2H double-array receiving coil is arranged on the 2H double-array receiving coil supporting cylinder; the 2H saddle coil and the 2H double-array receiving coil are respectively provided with a detuning circuit. According to the device, a double-resonance mode is adopted, and errors caused by replacement of resonance coils in 1H and 2H imaging experiments of traditional nuclear magnetic resonance are eliminated.

The application relates to the technical field of magnetic resonance imaging, in particular to a dual-frequency excitation coil, which comprises a first birdcage coil, a second birdcage coil, and the resonant frequency of the second birdcage coil is different from that of the first birdcage coil, and the second birdcage coil and the first birdcage coil at least partially overlap in the axial direction.

The application discloses a multi-mouse fixing device and a multi-mouse magnetic resonance imaging method, and belongs to the technical field of magnetic resonance imaging. The multi-mouse fixing device comprises a fixing device, at least two cavities are arranged in the fixing device, and the fixing device can be fixed in a magnetic resonance birdcage coil. The multi-mouse supporting module comprises at least two mouse supporting beds, the mouse supporting beds are slidingly arranged in the cavities, the mouse supporting beds are concavely provided with accommodating grooves, anesthetic masks are slidingly arranged on groove edge portions of opposite sides of the accommodating grooves, the anesthetic masks are provided with anesthetic openings, first ends of telescopic tooth bars are connected with groove bottom portions of the accommodating grooves, second ends of the telescopic tooth bars pass through the anesthetic openings, and the second ends are used for fixing the heads of experimental mice. The application can quickly adjust the positions of the experimental mice according to actual use conditions, so that imaging results of different organs are obtained, at least two experimental mice can be imaged at one time, the experimental efficiency is improved, and large sample quantity repetitive experiments can be facilitated.