A delta-relaxation magnetic resonance imaging (DREMR) system is provided. The system includes a main field magnet and field shifting coils. A main magnetic field with a strength B0 can be generated using the main filed magnet and the strength B0 of the main magnetic field can be varied through the use of the field-shifting coils. The DREMR system can be used to perform signal acquisition based on a pulse sequence for acquiring at least one of T2*-weighted signals imaging; MR spectroscopy signals; saturation imaging signals and MR signals for fingerprinting. The MR signal acquisition can be augmented by varying the strength B0 of the main magnetic field for at least a portion of the pulse sequence used to acquire the MR signal.

A delta-relaxation magnetic resonance imaging (DREMR) system is provided. The system includes a main field magnet and field shifting coils. A main magnetic field with a strength B0 can be generated using the main filed magnet and the strength B0 of the main magnetic field can be varied through the use of the field-shifting coils. The DREMR system can be used to perform signal acquisition based on a pulse sequence for acquiring at least one of T2*-weighted signals imaging; MR spectroscopy signals; saturation imaging signals and MR signals for fingerprinting. The MR signal acquisition can be augmented by varying the strength B0 of the main magnetic field for at least a portion of the pulse sequence used to acquire the MR signal.

In a method and magnetic resonance apparatus for determining a shim setting in order to increase a homogeneity of the basic magnetic field of the scanner of the apparatus by operating a shim element, information is obtained concerning the dependence of an induced field of the shim element on a set shim setting. A first field map is recorded and a first shim setting for the shim element is determined based on the first field map. A second field map is recorded while the shim element is driven with the first shim setting. A field induced by the shim element by the first shim setting is determined based on the first field map and the second field map. A second shim setting for the shim element is determined based on the determined induced field and the acquired information.

According to one embodiment, a MRI apparatus includes an RF coil apparatus receiving MR signals by coil elements corresponding to channels, modurating the MR signals to have different frequencies for each of the channels, and outputting an analog multiplexed signal in which the MR signals with different frequencies are composited over the channels, and a receiver including ADC circuitry converting the analog multiplexed signal to a digital multiplexed signal, and predetermined number of separation channels separating the digital multiplexed signal, based on the number of the channels relating to composition of the MR signals with the different frequencies. The receiver stops a separation process of the digital multiplexed signal for separation channels not used in the separation process among the predetermined number of separation channels.

Methods and systems for determining surface relaxivity from nuclear magnetic resonance measurements relate to applying multiple nuclear magnetic resonance (NMR) diffusion editing Carr-Purcell-Meiboom-Gill (CPMG) pulse sequences to the porous medium, wherein the diffusion editing CPMG pulse sequences have a diffusion encoding time Δ; receiving NMR data generated by the pulse sequences; processing the received NMR data to obtain a distribution f(T.sub.2,D) for the diffusion encoding time Δ; repeating the applying, the receiving, and the processing at least one time for pulse sequences having different respective diffusion encoding times Δ to obtain respective distributions f(T.sub.2,D) corresponding respectively to the different diffusion encoding times Δ; and utilizing the respectively obtained distributions f(T.sub.2,D) to generate a surface relaxivity (ρ) determination.

A method is offered which permits NMR measurements of integer spin nuclei to be performed at higher sensitivity than heretofore. In particular, the method enables high-resolution multidimensional correlation NMR measurements on integer spin nucleus S having integer spin S and nucleus I of other spin species. The method starts with applying an RF magnetic field having a frequency that is n times (where n is an integer equal to or greater than 2) the Larmor frequency of the integer spin nucleus S to the spin S. Magnetization transfer is effected between the nucleus I and the integer spin nucleus S.

A method for measuring the flow rate of a multi-phase medium flowing through a measuring tube using a nuclear magnetic resonance flow meter can be used to measure the flow rate of a multi-phase medium in a simplified manner. For this purpose, a measuring device is used which implements, at the end of each pre-magnetization path, 2D tomography in the measurement tube cross-sectional plane with stratification in the z direction; the measurement tube cross-sectional plane is subdivided into layers that are thin compared to the measurement tube diameter; nuclear magnetic resonance measurements are carried out in every layer to determine measurement signals, using pre-magnetization paths of different lengths; the flow rates are measured in every layer based on the measurement signals; and the time is determined from the signal ratios of the amplitudes of the measurement signals in every layer.

During operation, a system may apply a polarizing field and an excitation sequence to a sample. Then, the system may measure a signal associated with the sample for a time duration that is less than a magnitude of a relaxation time associated with the sample. Next, the system may calculate the relaxation time based on a difference between the measured signal and a predicted signal of the sample, where the predicted signal is based on a forward model, the polarizing field and the excitation sequence. After modifying at least one of the polarizing field and the excitation sequence, the aforementioned operations may be repeated until a magnitude of the difference is less than a convergence criterion. Note that the calculations may be performed concurrently with the measurements and may not involve performing a Fourier transform on the measured signal.

A high-precision magnetometer based on a miniature Penning trap is used to measure high magnetic field strengths with very high accuracy. Due to the high precision of the developed miniature charged particle trap, magnetic field strengths can be measured with an accuracy of 1 part per million or greater, including up to and above 1 part per billion. The charged particle trap has been configured to operate with such precision in environments of high radiation, e.g., 1 MGy or above.

A high-precision magnetometer based on a miniature Penning trap is used to measure high magnetic field strengths with very high accuracy. Due to the high precision of the developed miniature charged particle trap, magnetic field strengths can be measured with an accuracy of 1 part per million or greater, including up to and above 1 part per billion. The charged particle trap has been configured to operate with such precision in environments of high radiation, e.g., 1 MGy or above.