106 results about "Magnetic resonance spectrometers" patented technology

The invention concerns a superconducting high-field magnet system (1) for a high-resolution magnetic resonance spectrometer, comprising a magnet coil (4) which is superconductingly short-circuited during operation, and generates a homogeneous temporally stable magnetic field during operation that meets the requirements for taking a high-resolution magnetic resonance spectrum. The magnet coil (4) comprises an LTS partial coil (4b, 4c) and an HTS partial coil (4a, 4d). The LTS partial coil (4b, 4c) can be separately short-circuited in a pure LTS circuit (14b) via an LTS switch (15b), and the HTS partial coil (4a, 4d) can be separately short-circuited in a pure HTS circuit (14) via an HTS switch (15a) and both partial coils (4a, 4d; 4b, 4c) are connected via an LTS-HTS joint (20) and are charged by the same power supply.

A method of acquiring a nuclear magnetic resonance two-dimension J spectrum in a superfast manner through single scanning resisting a unidirectional nonuniform magnetic field environment is provided. By utilization cooperation of a selective excitation module and a reunion sampling module, limits of traditional two-dimension J spectrum methods are broken, a two-dimension J spectrum can be acquired by superfast sampling in the unidirectional nonuniform magnetic field environment, influences of unidirectional magnetic field nonuniformity are effectively eliminated, experiment time is greatly shortened, and the application field of the two-dimension J spectrum is broadened. The method is suitable for conventional nuclear magnetic resonance spectrometers, does not need any special hardware apparatus, does not need any special sample pretreatment process, is simple, convenient and feasible, and provides an important means for rapidly acquiring a two-dimension J spectrum of a complex organic sample.

The system describes a means and a method for stabilizing the magnetic field generated in the measuring volume of a high-resolution magnetic resonance spectrometer having an actively shielded magnet coil (4) which is located in a cryostat (2) and which is superconductingly short-circuited. The system comprises a compensation coil (12) which is decoupled from the magnet coil (4), and is disposed on the shielding coil (4b) of the magnet coil (4).

A transport device for transporting an NMR sample to the probe head (16) of an NMR spectrometer by means of a transport system (12) is characterized in that the transport device comprises a shuttle (15) adapted for use with a transport system. The transport system is structured to transport an HR-NMR sample spinner or an NMR MAS rotor (5). The shuttle includes a locking device for the NMR MAS rotor, the locking device being formed such that the NMR MAS rotor is released by unlocking the locking device and can be transferred to and received by the NMR MAS probe head. It is therefore possible to rapidly change from NMR spectroscopy of liquids to NMR spectroscopy of solids, and vice versa, simply by exchanging the probe head, without converting the transport system.

The invention discloses a special multichannel radio frequency echo signal down converter for an MR-EPT spectrometer, and belongs to the field of MR-EPT imaging. The down converter comprises a local oscillator signal generation module, a power division module and a frequency-mixing amplitude-modulation phase-modulation unit which are connected in sequence, and a control module for controlling thefrequency of a local oscillator signal output by the local oscillator signal generation module and controlling the frequency-mixing amplitude-modulation phase-modulation unit to adjust the amplitude and phase of an output signal. The frequency mixing amplitude modulation and phase modulation unit comprises a plurality of radio frequency amplitude modulation and phase modulation modules. The radiofrequency amplitude modulation and phase modulation module comprises a radio frequency signal processing module for performing sideband suppression and impedance matching on a radio frequency echo signal, which are connected in sequence; a frequency mixing module used for carrying out frequency mixing on multi-channel local oscillation signals output by the power dividing module and radio frequency signals output by the radio frequency signal processing module, a filtering module, an amplifying module, a phase modulation module controlled by the control module to carry out phase shift, and anamplitude modulation module controlled by the control module to carry out amplitude modulation. The problem that an existing magnetic resonance spectrometer cannot be used for MR-EPT imaging in a 9.4T ultrahigh magnetic field environment is solved.

A method for operating a magnetic resonance spectrometer with a digital filter whose input is fed with an NMR signal of a time length TA, and whose output signal consists of a rising oscillation B1 of a length TB, a signal portion [F]′ which consists of a filtered FID or echo signal of the length TA and a decaying oscillation B2 of a length TB, wherein this output signal is initially modified using a calculation process RV, and is subsequently transformed by Fourier transformation to a desired NMR spectrum, is characterized in that, during the calculation process RV, only the signal portion [F]′ is initially selected, at least N copies of the rising oscillation B1 are subsequently generated in positive time shifts TA with respect to each other and are positioned on the signal portion [F′] in time such that the end of the first rising oscillation is positioned at the end of the signal portion, at least N copies of the decaying oscillation B2 are generated in negative shifts TA and are positioned on the signal portion [F′] in time such that the start of the first decaying oscillation is positioned at the start of the signal portion [F′], and all N copies of the rising oscillation B1 defined in this manner and N copies of the decaying oscillation B2 defined in this manner are added to the signal portion [F′], and only the range TA thereof which contains the signal portion [F′] is selected as resulting signal F″ of the calculation process RV, wherein the number N is to be calculated using the formula N=TB / TA and rounded to the next higher integer number. This exactly compensates for the influence of the group delay time of digital, linear-phased filters in a mathematically exact manner.