A local coil for magnetic resonance imaging is disclosed herein. The local coil includes an electrical circuit arrangement and a coaxial cable with an internal conductor and an external conductor surrounding the internal conductor. The two ends of the coaxial cable are connected to the electrical circuit arrangement and the internal conductor and the external conductor together form an antenna loop. The internal conductor and/or the external conductor has at least one interruption and the at least one interruption divides the internal conductor and/or the external conductor into at least two separate segments in each case.

Asymmetric, single-channel radio frequency (“RF”) coils are provided for use with portable or other low-field magnetic resonance imaging (“MRI”) systems. In general, the asymmetric, single-channel RF coils make use of asymmetric, optimized winding configurations in order to reduce B1+ inhomogeneities and to reduce signal sensitivity outside of the desired imaging field-of-view (“FOV”).

A radiofrequency receive coil assembly can include a first conductive loop and a second conductive loop electrically connected at a node. The first and second conductive loops can extend into a treatment beam region of the radio frequency receive coil assembly through which one or more beams of ionizing radiation pass. The first conductive loop and the second conductive loop can overlap each other to provide electromagnetic isolation and/or can use a common conductor combined with a shared capacitor to provide electromagnetic isolation, with the shared capacitor or other electrical components, as well as any conductive loop overlaps, being positioned outside of the treatment beam region. These features can, among other possible advantages, minimize and homogenize attenuation of the beams of ionizing radiation by the radiofrequency receive coil assembly.

Apparatus for a nuclear resonance imaging (MRI) machine (100) that includes plasma elements (104, 106, 108). The MRI machine (100) includes gradient coils (104) that generate time-dependent gradient magnetic fields, transmitting elements (106) that excite target molecules (120) with RF energy (122), and receiving elements (108) responsive to RF energy (124) emitted by the excited molecules (120). The gradient coils (104) include plasma conductors (710) in which the plasma (716) is ignited by an exciter (208). The plasma conductors (710) are electrically connected to a gradient amplifier (206) that outputs a signal to produce the gradient fields. The transmitting elements (106) are plasma devices (710) configured to emit RF energy (122). The receiving elements (108) are plasma devices (710) responsive to emitted RF energy (124). An RF exciter (218) selectively and alternatingly ignites said plasma devices (710) to avoid coupling and interference between them.

The present disclosure relates to a head-dedicated magnetic resonance imaging (MRI) device, wherein a head-dedicated image is acquired in a state in which a head of a subject is positioned in a center of a magnetic field of a main magnet installed in a housing, a local coil manufactured in in the form of being inserted into or worn in a human body of the subject is utilized to acquire an image of a selected portion to be examined (for example, an oral region, an ear region, and an eye region) of the head, or a vibration absorber installed around the housing absorbs vibrations caused by the Lorentz force generated by a magnetic field of the main magnet and a current applied to a gradient coil while the image is acquired in a state in which the housing is hung on an installation frame.

An exemplary coil arrangement can be provided, which can include, for example, coil element(s) having a parallel resonant circuit at a port, where the coil element(s) is detuned by causing a low impedance at the port. Pre-amplifier arrangements can provide a low impedance at the port of the coil element(s) to suppress the induced current on the coil element(s) thereby reducing the inductive coupling to neighboring element(s). The coil element(s) can include an inductance and a capacitance which cancel each other out. The inductance and the capacitance can cancel each other out such that an impedance of the coil element has no imaginary part at a working frequency. An impedance of the coil element(s) in free space includes a real part that can be greater than a sum of losses for the coil element(s).

An MRI system receive coil arrangement 3 for use with a main MRI scanner arrangement. The arrangement includes at least one primary receive coil 6 having a first impedance at a predetermined frequency and a first size defined by a cross-sectional area bounded by the primary receive coil and at least one auxiliary receive coil 7 having a second impedance at said predetermined frequency and a second size defined by a cross-sectional area bounded by the auxiliary receive coil wherein the first impedance is lower than the second impedance and the first size is larger than the second size.

The present disclosure may provide a coil assmebly configured to transmit or receive a magnetic resonance (MR) signal. The coil assembly may include a coil, a support component, and a lock mechanism. The coil may include a first portion and a second portion detachably connected to the first portion. The support component may be configured to support the coil. The second portion of the coil may be movable with respect to the support component. The lock mechanism may be configured to lock or unlock the second portion of the coil and the support component.

An RF coil assembly for use in a Magnetic Resonance Imaging scanner incorporates sound absorbing material in its construction for the purpose of attenuating the sound perceived by a patient lying inside the RF coil. Unlike a conventional RF coil assembly in which rigid components are used to support the coil within the magnet bore, the quiet RF coil assembly is constructed without rigid support components. In one embodiment, open cell foam may be used to support the RF coil components and the entire assembly is wrapped in a. flexible cloth-like material.

An adjustable head coil system and methods for enhancing and/or optimizing magnetic resonance imaging, involving a housing, the housing having at least one portion, the at least one portion having a lower portion, an upper portion, and opposing side portions, each at least one portion optionally in movable relation to any other portion for facilitating adjustability, each at least one portion configured to accommodate at least one radio-frequency coil, and the upper and lower portions each optionally configured to overlap and engage the opposing side portions for facilitating decoupling the at least one radio-frequency coil, and a tongue portion optionally in movable relation to any other portion for facilitating adjustability, engageable with the lower portion, and fixably couple-able with a transporter.