Abstract: Some embodiments of the invention include a pre-pulse switching system. The pre-pulsing switching system may include: a power source configured to provide a voltage greater than 100 V; a pre-pulse switch coupled with the power source and configured to provide a pre-pulse having a pulse width of Tpp; and a main switch coupled with the power source and configured to provide a main pulse such that an output pulse comprises a single pulse with negligible ringing. The pre-pulse may be provided to a load by closing the pre-pulse switch while the main switch is open. The main pulse may be provided to the load by closing the main switch after a delay Tdelay after the pre-pulse switch has been opened.

Abstract: Body coil tuning control device having: DC-DC converter with input connected to a DC power supply of an MRI system and output connected to input of an LDO, output of the LDO connected to first connection of a first resistor group; a first opamp with non-inverting input connected to first connection of the first resistor group, inverting input connected to the second connection of the first resistor group, and output connected to gate of a MOSFET array; and a negative feedback circuit connected between the output and the non-inverting input of the first opamp. The MOSFET array has a drain connected to the second connection of the first resistor group and a source connected to the input of the body coil of the MRI system. After the output signal of the first opamp is input to the gate of the MOSFET array, the source outputs a constant preset current.

Abstract: A method for transmitting and receiving an electromagnetic radiation beam, adapted to determine an orbital angular momentum of the received electromagnetic radiation beam, is described. There is further described a system for transmitting and receiving an electromagnetic radiation beam, capable of performing the aforesaid method. A method for performing a telecommunication of signals modulated according to any modulation technique and grouped by means of orbital angular momentum multiplexing is further described. There is further described a telecommunication system capable of performing the aforesaid method for performing a telecommunication of modulated signals.

Abstract: Systems and methods for data transmission may be provided. The system may at least include a data transmission module. The system may obtain MR signals from one or more RF coils. The system may generate, via a first portion of the data transmitting module, first data based on the MR signals. The system may generate, via a second portion of the data transmitting module, second data based on the first data. The second portion of the data transmitting module may connect to the first portion of the data transmitting module wirelessly. The system may further store the second data in a non-transitory computer-readable storage medium.

Abstract: A solenoidal magnet section has a high-temperature-superconductor tape wound in a solenoidal manner in a main winding chamber of a coil former. Two joints, each from the HTS tape to a follow-on superconductor, are integrated in the magnet section. The terminal sections of the HTS tape and the associated follow-on superconductor are each wound onto the coil former and connected to one another in a laminar manner. The regions of the first and second joint are axially offset from each other and the main winding chamber. The magnet section occupies a radial range with limits less than 20% larger than the outer radius of the main HTS winding package and less than 20% smaller than the inner radius of the coil former in the region of the main winding chamber. A plurality of magnet sections can be inserted one inside the other to form a magnet coil assembly.

Abstract: An antenna device is provided as a near-field communication antenna device that is configured by arranging a plurality of loop antennas. Each loop antenna includes a plurality of parallel circuits each having a capacitor and a resistance element; and a plurality of looped conductors in a shape of a loop that is divided. The divided looped conductors are connected to each other via the parallel circuits, and the plurality of looped conductors and the plurality of parallel circuits form a loop.

Abstract: A coil unit for inductively charging a vehicle is provided. The coil unit includes a coil, wherein the coil includes multiple windings of at least two electric lines. The electric lines are connected in parallel. Each of the electric lines has a respective winding part, in which the windings are formed, and an additional part, in which an additional inductor unit having a predefined electric inductance is arranged.

Abstract: Disclosed are systems and methods that provide a framework for performing advanced image stabilization. The disclosed framework can operate to capture imagery used and/or relied upon for the preoperative (pre-op), operative and/or postoperative (post-op) stages of a medical procedure. The framework can function by collecting and monitoring sensor data related to a device of a user (e.g., a patient). The sensor data can be analyzed, whereby the framework can determine the most opportune time to capture an image(s)—for example, a computed tomography (CT) scan or magnetic resonance imaging (MRI) scan, and the like. Accordingly, the framework can leverage the determined capture opportunity to perform the image capture and storage of the image data and metadata, as well as perform a confidence score computation that enables validation or verification of the image's authenticity and quality.

Abstract: A method for performing magnetic resonance imaging is provided. The method includes providing a magnetic resonance imaging system comprising: a radio frequency receive system comprising a radio frequency receive coil, and a housing, wherein the housing comprises a permanent magnet for providing an inhomogeneous permanent gradient field, a radio frequency transmit system, and a single-sided gradient coil set. The method also includes placing the receive coil proximate a target subject; applying a sequence of chirped pulses via the transmit system; applying a multi-slice excitation along the inhomogeneous permanent gradient field; applying a plurality of gradient pulses via the gradient coil set orthogonal to the inhomogeneous permanent gradient field; acquiring a signal of the target subject via the receive system, wherein the signal comprises at least two chirped pulses; and forming a magnetic resonance image of the target subject.

Abstract: A system and method for performing magnetic resonance imaging (MRI), magnetic resonance spectroscopy (MRS), or magnetic resonance spectroscopy imaging (MRSI) at multiple resonant frequencies using a coil system. The coil system includes at least one conductive loop and a capacitor forming a radiofrequency (RF) resonant antenna and a tuning-matching circuit electrically connected to the RF resonant antenna to operate at multiple resonant frequencies across a desired operational range. The coil system also includes two legs electrically connecting the tuning-matching circuit to the RF resonant antenna and having a length selected to generate at least two selected resonant frequencies with a selected frequency difference.

Abstract: In the present invention, provided are a magnetic resonance imaging system, a method for determining a SAR value of a magnetic resonance imaging system, and a computer-readable storage medium. The system comprises a radio-frequency transmitting coil, configured to receive radio-frequency power from a radio-frequency transmitting link and transmit radio-frequency power required for imaging to a scanned object. The system further comprises a reflection coefficient determining module, a resistance value determining module, and a SAR value determining module. The reflection coefficient determining module is configured to acquire a frequency response of a first input reflection coefficient of the radio-frequency transmitting coil when having no load and a frequency response of a second input reflection coefficient thereof when having the scanned object.

Abstract: The receiving coil device includes one or a plurality of receiving coils configured to cover a head of a subject, a base portion on which the head of the subject is to be placed, a holder portion supported by the base portion, one of the receiving coils being fixed to the holder portion, a mechanism portion configured to bring the receiving coil fixed to the holder portion into close contact with a part of the head, and further, a detection unit configured to detect a physical quantity related to a displacement of the holder portion on the holder portion or the base portion. The physical quantity detected by the detection unit is sent to an MRI apparatus including the receiving coil device.

Abstract: A preamplifier arrangement for an MRI system includes a preamplifier coupled to a loop of a multi-channel coil array of the MRI system, wherein the preamplifier and the loop are subject to potentially form an unstable system with oscillation at one or more peak frequencies. The preamplifier arrangement also includes an impedance matching network disposed between and coupled to the preamplifier and the loop. The impedance matching network is configured to generate a high blocking impedance. The preamplifier arrangement further includes an input network disposed between and coupled to the preamplifier and the loop. The input network is configured to provide an input to suppress gain at the one or more peak frequencies.

Abstract: An electric circuit arrangement for energizing a magnet of a magnetic resonance imaging facility includes a first circuit part, a second circuit part and a control facility. In an embodiment, the first circuit part is designed to generate a direct voltage as an DC link voltage from an alternating voltage and the second circuit part is designed as a current source fed by the DC link voltage. The second circuit part includes a down converter controllable by the control facility, a transformer switchable by the control facility and a rectifier. A primary current is generatable from the DC link voltage via the down converter. The primary current is feedable by a switching facility, switched by the control facility into a primary side of the transformer, and a secondary current for energizing the magnet is generatable via the rectifier connected to a secondary side of the transformer.

Abstract: A high-frequency magnetic field generating device includes two coils arranged with a predetermined gap in parallel with each other, the two coils (a) in between which electron spin resonance material is arranged or (b) arranged at one side from electron spin resonance material; a high-frequency power supply that generates microwave current that flows in the two coils; and a transmission line part connected to the two coils, that sets a current distribution so as to locate the two coils at positions other than a node of a stationary wave.

Abstract: An apparatus and method for improved S/N measurements useful for electron paramagnetic resonance imaging in situ and in vivo, using high-isolation transmit/receive surface coils and temporally spaced pulses of RF energy (e.g., in some embodiments, a RF pi pulse) having an amplitude sufficient to rotate the magnetization by 180 degrees followed after varied delays, by a second RF pulse having an amplitude half that of the initial pulse to rotate the magnetization by, e.g., 90 degrees (a pi/2 pulse), to the plane orthogonal to the static field where it evolves for a short time. Then a third RF pi pulse sufficient to rotate the magnetization by, e.g., 180 degrees, forms an echo (in some embodiments, the second and third pulses are from the same signal as the first pulse but are phase shifted by 0, 90, 180, or 270 degrees to reduce signal artifact), to image human body.

Abstract: A power supply facility for supplying a magnetic resonance facility with electrical power includes a control facility, a network connection to a power network, and an electrical energy store, such as a battery. The network connection is configured for an installed power level that is lower than a maximum power level that may be demanded by the magnetic resonance facility. The control facility is configured, in the event that a power demand of the magnetic resonance facility exceeds the installed power, to provide the power from the network connection and the energy store.

Abstract: A system for minimizing MGI in a superconducting magnet system of an MRI system includes a thermal shield having bi-metal material. The thermal shield is configured to be disposed about a cold mass of the superconducting magnet system, wherein the bi-metal material is configured to minimize MGI.

Abstract: Devices and methods are disclosed for an optical component mounting system for supporting an optical component such as a laser. The mounting system comprises a first component comprising a first surface, a second component comprising a second surface facing the first surface, and adhesive between the first surface of the first component and the second surface of the second component, wherein the first component comprises at least three mounting pads extending from the first surface for contacting the second surface of the second component and providing direct support between the first component and the second component. The component comprising the mounting pads may be a lower mount, an upper mount such as an upper clamping mount, or a bonding pad or other component in the stack of components. A method of assembling the stack of components may comprise curing the adhesive at a temperature at or above an upper end of an expected temperature operating range for the optical component mounting system.

Abstract: Some embodiments of the present disclosure relate to a displacer for reducing the consumption of a cryogen used in a superconductive magnet device. The displacer may occupy some space within the cryogen storage cavity or limit the cryogen into a relatively small space surrounding a superconductive coil in the cryogen storage cavity. The displacer may also include a displacer cavity that may be vacuum or contain a cryogen or another substance.

Abstract: Various methods and systems are provided for a flexible, lightweight and low-cost stretchable radio frequency (RF) coil of a magnetic resonance imaging (MRI) system. In one example, a RF coil assembly for a MRI system includes a loop portion comprising distributed capacitance conductor wires, a coupling electronics portion including a pre-amplifier; and a stretchable material to which the loop portion and coupling electronics portion are attached and/or enclosed therein.

Abstract: Embodiments of a compact portable nuclear magnetic resonance (NMR) device are described which generally include a housing that provides a magnetic shield; an axisymmetric permanent magnet assembly in the housing and having a bore, a plurality of magnetic elements that together provide a well confined axisymmetric magnetization for generating a near-homogenous magnetic dipole field B0 directed along a longitudinal axis and providing a sample cavity for receiving a sample, and high magnetic permeability soft steel poles to improve field uniformity: a shimming assembly with coils disposed at the longitudinal axis for spatially correcting the near homogenous magnetic field B0; and a spectrometer having a control unit for measuring a metabolite in the sample by applying magnetic stimulus pulses to the sample, measuring free induction delay signals generated by an ensemble of hydrogen protons within the sample; and suppressing a water signal by using a dephasing gradient with frequency selective suppression.

Abstract: An apparatus and method for receiving a magnetic resonance (MR) signal for imaging a patient. The MR signal includes a MR frequency. A radio frequency (RF) coil has first and second end portions. An impedance converter is in electrical communication with the RF coil. A preamplifier in electrical communication with the impedance converter, the preamplifier having a gain. At least one resonant circuit electrically connected to at least one end portion of the RF coil.

Abstract: A method of protecting a superconducting magnet from quenches, the superconducting magnet having at least one primary coil comprising high temperature superconductor, HTS, material. A secondary HTS tape is provided, the secondary HTS tape being in proximity to and electrically insulated from the primary coil, and being configured to cease superconducting at a lower temperature than the primary coil during operation of the magnet. A loss of superconductivity in the secondary HTS tape is detected. In response to said detection, energy is dumped from the primary coil into an external resistive load.

Abstract: A superconductor bulk magnet magnetizing method providing a more homogenous trapped magnetic field includes: placing the bulk magnet inside a charger bore of an electrical charger magnet; placing a field correction unit inside a superconductor bore of the bulk magnet; applying an electrical current (I0) to the charger magnet, to generate an externally applied magnetic field, wherein a temperature Tbulk of the bulk magnet exceeds a bulk magnet critical temperature Tc; applying an auxiliary electrical current (I1, . . . ) to the field correction unit, thus generating an auxiliary magnetic field applied to the bulk magnet from within the superconductor bore, wherein Tbulk>Tc; lowering Tbulk below Tc; turning off the electrical current at the charger magnet, wherein Tbulk<Tc, and turning off the auxiliary electrical current at the field correction unit, wherein Tbulk<Tc; and removing the bulk magnet from the charger bore while Tbulk<Tc.

Abstract: The disclosure relates to a method, a computer program, a data storage medium, a system, and a local-coil apparatus for a magnetic resonance tomography MRT unit having at least one receive coil configured to receive an MRT signal and a receive amplifier apparatus having at least one output amplifier unit and configured to amplify the received MRT signal in order to drive an analog-to-digital converter ADC. The at least one output amplifier unit is configured to amplify the MRT signal, below a signal-level threshold value, by a high gain, and, above the signal-level threshold value, by a low gain. The receive amplifier apparatus is configured to change a bias current of the at least one output amplifier unit according to a defined MRT signal level.

Abstract: A method of medical imaging including receiving k-space data that is divided into multiple k-space data groups, selecting one of the multiple k-space data groups as a reference k-space data group, and calculating spatial transform data for each of the multiple k-space data groups by inputting the multiple k-space data groups and the reference k-space data group into a transformation estimation module. The spatial transformation estimation module is configured for outputting spatial transform data descriptive of a spatial transform between a reference k-space data group and multiple k-space data groups in response to receiving the reference k-space data group and the multiple k-space data groups as input. The method further comprises reconstructing a corrected magnetic resonance image according to the magnetic resonance imaging protocol using the multiple k-space data groups and the spatial transform data for each of the multiple k-space data groups.

Abstract: The disclosure relates to a receiving unit configured for acquiring MR signals from an examination object in a magnetic resonance device. The receiving unit may include a detector unit comprising a light source and a first optical detector, a sensor unit comprising a first optical magnetometer, a first optical waveguide connecting the sensor unit to the light source, and a second optical waveguide connecting the sensor unit to the first optical detector.

Abstract: Uptake of hypoxia-sensitive PET tracers is dependent on tissue transport properties, specifically, distribution volume. Variability in tissue transport properties reduces the sensitivity of static PET imaging to hypoxia. When tissue transport (vd) effects are substantial, correlations between the two methods of determining hypoxic fractions are greatly reduced—that is, trapping rates k3 are only modestly correlated with tumour-to-blood ratio (TBR). In other words, the usefulness of dynamic- and static-PET based hypoxia surrogates, trapping rate k3 and TBR, in determining hypoxic fractions is reduced in regions where diffusive equilibrium is achieved slowly. A process is provided for quantifying hypoxic fractions using a novel biomarker for hypoxia, hypoxia-sensitive tracer binding rate kb, based on PET imaging data. The same formalism can be applied to model the kinetics of non-binding CT and MT contrast agents, giving histopathological information about the imaged tissue.

Abstract: The disclosure relates to a gradient coil unit comprising at least one first conductor structure, which is configured to generate a magnetic field gradient in a first direction, and an eddy current compensating conductor structure, which is configured to compensate for a first magnetic field. The first magnetic field is generated by a current induced in the first conductor structure as a result of activation of a conductor structure comprised by the gradient coil unit.

Abstract: A MR wireless receiving coil device may include transmitters and receivers, the number of the receivers being equal to or greater than the number of the transmitters; each transmitter comprises: a coil group, an ADC group, two baseband low-pass filters, and an IQ modulation transmitter, wherein the coil group is connected to the ADC group, the ADC group is connected to the two baseband low-pass filters, the two baseband low-pass filters are connected to the IQ modulation transmitter, and the IQ modulation transmitter is provided with an antenna; each coil group contains one or more coils, and the maximum number of coils contained in each coil group is determined by available bandwidth, modulation scheme, and the bandwidth, sampling rate, and sampling accuracy of MR signal. The device and corresponding method advantageously allows an increase in the amount of magnetic resonance information transmitted per unit frequency band.

Abstract: A table for an MRI system includes a top surface for supporting a patient being imaged and a motion sensor for sensing motion of the patient. The motion sensor is located below the top surface and includes a self-resonant spiral (SRS) coil and a coupling loop. The coupling loop generates a drive RF signal to excite the SRS coil to radiate a magnetic field having a predefined resonant frequency. The coupling loop also receives a reflection RF signal from the SRS coil. The motion sensor is located such that at least a portion of a torso of the patient being imaged is within the magnetic field. A controller is configured to detect patient motion based on the reflection RF signal.

Abstract: A magnetic resonance (MR) local coil and an MR apparatus are provided. The MR local coil includes at least one antenna layer, at least one first layer, at least one second layer, and at least one third layer. In this structure, at least one MR antenna is arranged on the antenna layer. The at least one first layer is arranged between the at least one antenna layer and the at least one second layer, and the at least one second layer is arranged between the at least one first layer and the at least one third layer.

Abstract: The present disclosure directs to a system and method for configuring a pulse sequence in MRI. The method may include obtaining a preliminary gradient pulse configuration, wherein the preliminary gradient pulse configuration relates to a portion of a pulse sequence to be implemented by one or more coils of an MR scanner, the pulse sequence including a plurality of gradient pulses. The method may also include determining a global peripheral nerve stimulation (PNS) value of the preliminary gradient pulse configuration according to a PNS model. The method may further include determining a target gradient pulse configuration based at least in part on the preliminary gradient pulse configuration, the global PNS value, and a PNS threshold.

Abstract: The present disclosure reports on a method to first determine the required electromagnetic stream function, and then iterate on the contouring of the stream function to optimize the force, torque, shielding, and/or mutual inductance of the design after-the-fact without compromising the electromagnetic performance and an electromagnetic coil manufacture according to the method. These parameters are sensitive to the precise positioning of the discrete wires.

Abstract: Systems and devices are provided in which an RF wireless bridge is employed to facilitate indirect transmission of communication signals between external devices located outside of an electromagnetically shielding enclosure within internal devices located within the enclosure, via the intermediate transmission of RF waves through an RF attenuating window forming a portion of the enclosure. The wireless bridge is formed from a first RF communication device located within the electromagnetically shielding enclosure, and a second RF communication device located outside of the enclosure, where the two RF communication devices are positioned with sufficient proximity such that the wireless bridge facilitates indirect communication through the RF attenuating window despite attenuation of RF energy by the RF attenuating window.

Abstract: A magnetic resonance (MR) receive device comprises a coil or coil array including at least one radiofrequency (RF) coil element wherein each RF coil element comprises a coil and a preamplifier connected to amplify an output of the RF coil element to generate an amplified RF signal. The MR receive device further includes an RF-over-Fiber module comprising an optical fiber, a photonic device optically coupled to send an optical signal into the optical fiber, and an RF modulator connected to modulate the optical signal by an MR signal comprising the amplified RF signal.

Abstract: A local coil, a magnetic resonance tomography scanner, a system including local coil and magnetic resonance tomography scanner, and a method for operating the system are provided. The local coil has an active detuning facility and a passive detuning facility with substantially separate circuits. The magnetic resonance tomography scanner includes a local coil actuation for actuating the active detuning facility and a local coil monitoring for the detuning facilities, which likewise have substantially separate circuits.

Abstract: A dual frequency coil package system for use in transmitting and receiving at least two frequencies in an MRI system, including a frequency converter coupled to the MRI system to receive a first frequency through the local transmit coil port and convert the first frequency to a second frequency, a second frequency transmit coil to receive the second frequency from the frequency converter and to transmit the second frequency, a dual tuned receiver coil to receive and to output the at least two frequencies, and a switchable receiver to receive the at least two frequencies output from the dual tuned receiver coil and to transmit the first frequency received from the dual tuned receiver coil directly to the MRI system, and to convert the second frequency received from the dual tuned receiver coil to the first frequency before transmission to the MRI system.

Abstract: Techniques are disclosed for creating measurement data of an examination object by means of magnetic resonance technology in a plurality of repetitions according to a pulse sequence pattern, existing information about gradients that have already been switched is considered to determine compensation gradients that are possibly to be switched in a following repetition for compensating eddy current effects. Such dynamic determination and switching of compensation gradients make it possible to dynamically compensate eddy currents. Consequently, the image quality of image data reconstructed from measurement data acquired using inventive compensation gradients is increased.

Abstract: A method for checking a detuning facility of an antenna coil of a magnetic resonance tomography unit, and a magnetic resonance tomography unit for carrying out the method are provided. In the method, a detuning facility of the antenna coil is activated. A first receive signal and a second receive signal are received. The first receive signal and the second receive signal are compared, and a warning signal is output depending on a result of the comparison.

Abstract: The invention relates to a magnetic resonance imaging (MRI) system with emergency quench.

Abstract: A sheath wave barrier (2) for suppressing electromagnetic RF coupling phenomena of an electrical cable (4) at a predetermined suppression frequency (coo) in a magnetic resonance (MR) imaging or spectroscopy apparatus, wherein the cable is configured as a shielded cable with at least one inner conductor (6) and a peripherally surrounding electrically conducting cable sheath (8), comprises a segment of said shielded cable and a primary inductor formed from said shielded cable segment between a first cable location (12) and a second cable location (14). A secondary inductor (16) formed by a conductor is concentrically arranged within or around the primary inductor between said first and second cable locations.

Abstract: Method and apparatus for hardware coil compression is disclosed. The coils in an array configured for the same region of interest are grouped into sub-arrays. The coils of each sub-array are pre-combined with a hardware combiner before further processing. The pre-combination converter composed of the pre-combiners is flexible, i.e., applicable to for example non-cylindrical coils; simpler than direct implementation of the software compression algorithm; and commercially feasible.

Abstract: A magic angle sample spinning nuclear magnetic resonance system including a housing, a cryogenic fluid in the housing, a magnet in the housing, a probe in the housing, a magic angle sample spinning insert in the probe, a sample battery in the magic angle sample spinning insert, a photovoltaic cell in the magic angle sample spinning insert wherein the photovoltaic cell is connected to the sample battery, an optic fiber operatively connected to the photovoltaic cell, and a laser operatively connected to the optic fiber wherein the laser provides power to charge the sample battery during the magic angle sample spinning nuclear magnetic resonance.

Abstract: A radio frequency (RF) antenna element with a (de)tuning system, with the RF antenna element having a resonant electrically conductive loop and a (de)tuning system including a photosensitive switching element to (de)tune the resonant electrically conductive loop. The (de)tuning system comprises an injection optical source optically coupled to the photosensitive switching element.

Abstract: A dual nuclear MR transmission line resonator is capable of operating on 1X pairs, with X being 31P, 23Na, 3He, or 129Xe. The resonator avoids many of the problems inherent in conventional dual nuclear designs. No LC trap is used, and the coil has substantially the same spatial profile on both nuclei. In the resonator, an augmented MR tune/match circuit, includes a conventional capacitive L circuit, with the L circuit shunted at a match point by a notch filter tuned to a frequency of a companion nucleus. Also disclosed is a method for simultaneously resonating conductive loops of surface coils or conductive elements of volume coils simultaneously on both 1H and X with hybrid transmission line termination elements bonded to the resonator loop or conductive elements in shunt with respect to one another.

Abstract: A magnetic resonance coil and a magnetic resonance imaging system using the same are provided. The magnetic resonance coil may include an antenna, an amplifier, and a protective circuit. The antenna may be configured to receive a radio frequency (RF) signal emitted from an object. The antenna may not resonate with the RF signal. The amplifier operably coupled to the antenna configured to amplify the RF signal. The protective circuit may be configured to protect the antenna and the amplifier.

Abstract: The bridge circuit comprises input terminals (102.1, 102.2) for connecting a power source (103), a first branch (104) connected between the input terminals (102.1, 102.2). The first branch includes a first and a second section (108.1, 108.2). The first section (108.1) includes a first switch (107.1) and the second section (108.2) includes a second switch (107.2). The method comprises the steps of determining a measured value by measuring a current flowing in or a voltage across one of the two sections (108.1, 108.2), comparing the measured value with a threshold and controlling a switching of the first and the second switch (107.1, 107.2) of the first branch (104) in dependency of a result of said comparison.

Abstract: A telescoping magnetic resonance coil for a magnetic resonance imaging apparatus has a first coil half in a first coil housing, having a first coil support and a number of first coil units on the first coil support. The telescoping coil also has a second coil half in a second coil housing, having a second coil support and a number of second coil units on the second coil support. One end of the first coil housing is opposite to and slidable relative to one end of the second coil housing, and one end of the first coil support is opposite to and slidable relative to one end of the second coil support. The first coil units at the one end of the first coil support have connections to which sliding contacts of the second coil units at the one end of the second coil support are electrically connectable. The connections are slidable on the sliding contacts, and each of the sliding contacts is provided with a frequency compensation element that maintains a magnetic resonance frequency of the coil at a constant value.