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.

A method of magnetic resonance (MR) tomography imaging an object (1) comprises arranging the object in a static magnetic field, subjecting the object to at least one radiofrequency pulse and magnetic field gradients for creating spatially encoded MR signals, acquiring MR signals, and reconstructing an object image utilizing the spatial encoding of the MR signals, wherein, during the acquiring step, the MR signals are subjected to a locally specific frequency modulation by means of at least one spatially restricted, time-varying magnetic modulation field with a component parallel to the static magnetic field, and the step of reconstructing the object image further utilizes the frequency modulation for obtaining spatial information from the spatially encoded MR signals. An MR imaging device (100) includes an MR scanner (110) with a magnetic field modulation source device (114) for creating a spatially restricted, time-varying magnetic modulation field, a control device (120) and a reconstruction device (130) for reconstructing the object image by utilizing a frequency modulation of collected MR signals for obtaining spatial image information.

A low-field magnetic resonance imaging (MRI) system. The system includes a plurality of magnetics components comprising at least one first magnetics component configured to produce a low-field main magnetic field B.sub.0 and at least one second magnetics component configured to acquire magnetic resonance data when operated, and at least one controller configured to operate one or more of the plurality of magnetics components in accordance with at least one low-field zero echo time (LF-ZTE) pulse sequence.

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.

A low-field magnetic resonance imaging (MRI) system. The system includes a plurality of magnetics components comprising at least one first magnetics component configured to produce a low-field main magnetic field B.sub.0 and at least one second magnetics component configured to acquire magnetic resonance data when operated, and at least one controller configured to operate one or more of the plurality of magnetics components in accordance with at least one low-field zero echo time (LF-ZTE) pulse sequence.

A method of magnetic resonance tomography includes arranging an object in a static magnetic field, subjecting it to radiofrequency (RF) pulses and magnetic field gradients for creating spatial encoding of magnetic resonance signals, acquiring the signals with at least two RF receive coils, each with a self-resonance frequency and a spatially restricted sensitivity profile, and reconstructing an object image. Spatial encoding of the signals by the gradients and the profiles is utilized, wherein the profile of at least one of the coils is subjected to a temporal sensitivity profile modulation while acquiring the signal. The self-resonance frequency of the at least one coil is set within a predetermined receive bandwidth of a constant resonance frequency value during the modulation. The reconstructing further utilizes the modulation for obtaining additional spatial information to the spatial encoding of the signals by the gradients. Furthermore, an MRI device is described.

A magnetic resonance measurement apparatus according to the present invention includes a first LC circuit that forms an oscillating magnetic field that causes an object to exhibit magnetic resonance. The first LC circuit includes a parallel connection assembly including a diode. The parallel connection assembly further includes a diode connected, in parallel and in reverse direction, to the diode, or an inductor connected in parallel to the diode. In a first state in which oscillating voltage for forming the oscillating magnetic field is applied to the first LC circuit, the diode of the parallel connection assembly functions as a short-circuit such that the resonance frequency of the first LC circuit becomes a first resonance frequency. In a second state in which oscillating voltage is not applied to the first LC circuit, the diode of the parallel connection assembly functions as capacitance such that the resonance frequency of the first LC circuit becomes a second resonance frequency that is different from the first resonance frequency.

A MRI quality assurance phantom with a base and a vertical body mounted on the base. At lease one of the base and the vertical body have a housing made of a MRI invisible material and enclose a sealed reservoir filed with a MRI signal producing material. The vertical body has a generally planar face with one or more attachment points thereon for attachment of one or more accessories to the face of the vertical body. The interior walls of the housing, defining the shape of the sealed reservoir, have one or more defined structures formed thereon, suitable for image quality testing.

A magnetic resonance detection (MRD) system for and methods of detecting and classifying multiple chemical substances is disclosed. In one example, the presently disclosed MRD system is a nuclear quadrupole resonance (NQR) detection system that provides multi-frequency operation for substantially full coverage of the explosive NQR spectrum using a broadband transmit/receive (T/R) switch (or duplexer) and a single multi-frequency radio frequency (RF) transducer. More particularly, the MRD system provides a frequency-agile system that can operate over a wide band of frequencies or wavelengths. Further, a method of detecting and classifying various chemical substances is provided that includes pulse sequencing with frequency hopping, phase cycling for reducing or substantially eliminating background noise, and/or a process of mitigating amplitude modulation (AM) radio interference.

The invention discloses an RF coil element and an RF coil for magnetic resonance imaging, wherein the RF coil element is connected with an active loss circuit capable of actively dissipating and absorbing RF power in the RF coil element to decrease the Q value of the coil element. The active loss circuit is connected to the coil element to absorb the RF power in the coil element to decrease the Q value of the coil element, so that the coupling degree (correlation coefficient) between every two elements of an array coil formed by the coil elements is decreased, thus improving the parallel transmission (pTX) performance and the uniformity of a magnetic resonance RF transmission field.