Systems and methods for MR signal synchronization may be provided. The method may include determining a time difference in a local clock generator at a coil side assembly compared to a system clock generator at a system side assembly. The method may include maintaining a constant phase difference between clock signals generated by the local clock generator and by the system clock generator by correcting the local clock generator based on the time difference. The method may include acquiring MR echo signals by scanning at least a part of a subject in response to the clock signal generated by the corrected local clock generator. The method may further include digitizing the MR echo signal at the coil side assembly.

Systems and methods are provided for multiphotonic magnetic resonance imaging. The system uses one or more (B.sub.1,z) RF coils or oscillating gradients oriented along the z-axis to provide multiphoton resonances. The B.sub.1,z coils can be implemented as planar coils or solenoids. With the additional coils, standard slice-selective pulse sequences have all standard excitations replaced with multiphoton excitations that excite extra resonances. In vivo imaging using multiphoton excitation has signal to noise ratios comparable to single-photon excitations when similar pulse sequences are used. Since excitation is not bound to the Larmor frequency, new RF pulse sequences can be designed with imaging methods patterned after single-photon excitation concepts.

A magnetic resonance (MR) local coil and a magnetic resonance apparatus are disclosed. The MR local coil includes an antenna unit having at least one antenna for receiving and/or transmitting high frequency (HF) signals; a connection cable for connecting the MR local coil to a magnetic resonance apparatus; and a two-dimensional, (e.g., ribbon-shaped), transmission element for transmitting energy, (e.g., electrical energy), and/or signals, (e.g., electrical and/or optical signals), between the connection cable and the antenna unit. In this case, the transmission element is at least in part arranged about an axis of rotation in a spiral manner.

A system to perform magnetic resonance imaging includes a transmit coil that has a plurality of transmitters. The transmit coil is configured to receive at least a portion of an implant that is within a pediatric patient. The system also includes a controller operatively coupled to the transmit coil. The controller is configured to identify a region within the transmit coil with zero electric field while the transmitters are transmitting. The controller is also configured to rotate the transmit coil around the pediatric patient such that the implant is located within the region with zero electric field to avoid radio frequency heating of the implant.

A system to perform magnetic resonance imaging includes a transmit coil that has a plurality of transmitters. The transmit coil is configured to receive at least a portion of an implant that is within a pediatric patient. The system also includes a controller operatively coupled to the transmit coil. The controller is configured to identify a region within the transmit coil with zero electric field while the transmitters are transmitting. The controller is also configured to rotate the transmit coil around the pediatric patient such that the implant is located within the region with zero electric field to avoid radio frequency heating of the implant.

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.

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.

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.

A transmitting device and a method for transmitting two high frequency signals for a magnetic resonance tomograph are provided. The transmitting device includes a shielded balanced transmission line, a first signal driver, and a second signal driver. The first signal driver and the second signal driver feed the first high frequency signal to a first conductor and the second high frequency signal to a second conductor of the balanced transmission line. A shielding of the balanced transmission line has an electrical connection to a common ground potential for the first signal driver and the second signal driver.

A transmitting device and a method for transmitting two high frequency signals for a magnetic resonance tomograph are provided. The transmitting device includes a shielded balanced transmission line, a first signal driver, and a second signal driver. The first signal driver and the second signal driver feed the first high frequency signal to a first conductor and the second high frequency signal to a second conductor of the balanced transmission line. A shielding of the balanced transmission line has an electrical connection to a common ground potential for the first signal driver and the second signal driver.