A two-channel magnetic resonance tomography system is provided with a regulation circuit for an amplification system in order to be able to take into account different load situations of the MRI system in a flexible and efficient manner. It is thus possible to improve the MRI measurements greatly if the MRI system is set to the respective load situation beforehand by an idle state measurement. The adaptation may optionally also be carried out during the MRI measurement. Therefore, a multiplicity of completely different load situations may be taken into account in an optimized manner by the regulation circuit.

A radio frequency (RF) system comprises an RF-array of antenna elements, a regulating arrangement to tune the antenna elements' impedances and a camera system to acquire image information of the RF-array. An analysis module is provided to derive operational settings such as resonant tuning settings, decoupling and impedance matchings of the antenna elements' impedances from the image information. The image information also represents the actual impedances and resonant properties of the RF-array. From the image information appropriate impedance settings can be derived that are the tuning parameters to render the RF-array resonant.

The Magnetic Resonance Imaging (MRI) system includes a radio-frequency transmitter with multiple transmit channels. The MRI system includes an impedance matching network (320, 1402, 1502, 1602) for matching the radio-frequency transmitter to a remotely adjustable radio-frequency antenna (310, 1504, 1602) with multiple antenna elements (312, 314, 316, 318, 1404). The MRI system includes a processor (336) for controlling the MRI system. The execution of the instructions by the processor causes it to: measure (100, 200) a set of radio-frequency properties (352) of the radio-frequency antenna, calculate (102, 202) a matching network command (354) using the set of radio-frequency properties and a radio frequency model (366), and adjust (104, 204) the impedance matching network by sending the matching network command to the impedance matching network, thereby enabling automatic remote impedance matching.

A self-decoupled RF coil and method for adjusting the same is disclosed. The RF coil is an array of elements including at least one loop. Electromagnetic coupling between elements in the array causes an induced current in the at least one loop. The induced current has two modes. A reactance inserted in the at least one loop balances the two modes. The balanced current modes cancel. This cancelation results in self-decoupling of at the least one loop from the other elements in the RF coil array.

An intracavity probe for use with a magnetic resonance system includes: a pair of coil loops arranged in a phased array configuration; a pair of decoupling circuits; a pair of output cables; and a spacer material positioned adjacent to an anterior surface of the coil loops. Each coil loop has a drive capacitor and a tuning capacitor. Each decoupling circuit is connected across the tuning capacitor of one of the coil loops. Each output cable is connected at a first end thereof across the drive capacitor of one of the coil loops such that each of the drive capacitors is provided with a separate ground. The spacer material assures a predetermined distance between the pair of coil loops and the region of interest, which thereby reduces intensity of the magnetic resonance signals in proximity to the coil loops, maintains SNR at depth within the region of interest and reduces artifacts.

A local breast coil is designed to be tightly coupled to the natural shape of the pendant breast to provide high SNR for diagnostic MR imaging applications, while still providing access for interventional procedures through openings in the coil. In accordance with one configuration, the coil has a symmetrical design, such that the coil can be rotated about the breast to position an opening in the coil proximate to a desired portion of the breast without incurring registration or other alignment or artifact errors due to inhomogeneous B1 excitation. Furthermore, the coil is designed to facilitate medial and lateral imaging of the breast. The coil is combined with a patient support system that facilitates rotation of the coil and interchangeability of the coil to match the configuration of the coil to the position of the breast being imaged.

A multiple-channel antenna includes a first loop resonator including a radiating element forming a loop; a second resonator adjacent to the first loop resonator including a radiating element; wherein the radiating element of the first loop resonator has a main surface defined along a first median plane; a secondary surface defined along a second median plane, the secondary surface delimiting an appendix of the radiating element placed facing the second resonator and having an inclination relative to the median plane of the main surface and wherein the second resonator is a linear resonator with a straight radiating element.

A magnetic resonance apparatus comprising: a magnetic system configured to provide a magnetic field throughout at least a portion of a cavity, the magnetic field based on magnetic-system-control-data; a transmitter antenna disposed at least partly within the cavity and configured to transmit radio-frequency-transmitted-signalling based on transmitter-control-data; and a receiver antenna disposed at least partly within the cavity and configured to receive radio-frequency-received-signalling representative of magnetic resonance interactions of at least one object, disposed within the portion of the cavity, with the magnetic field and the radio-frequency-transmitted-signalling; wherein, at least one of the transmitter antenna, the receiver antenna and the magnetic system comprises a plasma antenna, and the magnetic resonance imaging apparatus is configured to provide received-data representative of the radio-frequency-received-signalling, the received-data in combination with the magnetic-system-control-data and the transmitter-control-data suitable for providing magnetic resonance imaging and/or magnetic resonance spectroscopy of the at least one object.

A technique for reconciling large sensitivity area and high sensitivity for deep part in a multi-channel array coil of an MRI apparatus without complicating the configuration, and realizing both higher speed imaging and high image quality is provided. An RF coil (array coil) of a magnetic resonance imaging apparatus comprising a plurality of subcoils is provided. At least one of the subcoils is a first subcoil of which resonance frequency as that of the subcoil alone differs from magnetic resonance frequency. The first subcoil is adjusted so that it magnetically couples with a second subcoil, which is at least one other subcoil, and thus resonates at the same frequency as the magnetic resonance frequency. Input and output terminals of the first subcoil and the second subcoil are connected to different low input and output impedance signal processing circuits, respectively.

The present disclosure is directed to a coil unit decoupling apparatus and a magnetic resonance system. The apparatus is connected to a first coil unit and a second coil unit in a magnetic resonance system, and is configured to separate, by using a distribution characteristic of a spatial quadrature field between the first coil unit and the second coil unit, a Helmholtz signal and an anti-Helmholtz signal from signals received from the first coil unit and the second coil unit, so as to implement decoupling between the first coil unit and the second coil unit. This facilitates the complexity of decoupling coil units being reduced.