A fat suppressed diffusion image determination apparatus, a corresponding method and a corresponding computer program determine a diffusion weighted magnetic resonance image (DWI) of an object. The fat suppressed diffusion image determination apparatus includes a diffusion reference image providing unit for providing a diffusion reference MR image of the object, a fat image determination unit for determining a fat image from the diffusion reference MR image, a diffusion weighted image providing unit for providing a diffusion weighted MR image of the object, a fat suppressed image determination unit for determining a fat suppressed diffusion weighted MR image using a combination of the diffusion weighted MR image and the fat image.

A method for supplying electrical power to a gradient amplifier that drives a gradient coil for a magnetic resonance imaging system is provided. The method includes predicting a gradient voltage required to drive the gradient coil for a scan based at least in part on a gradient coil model. The method further includes calculating a voltage set point for a power supply based at least in part on the predicted gradient voltage. The method further includes providing electrical power to the gradient amplifier via the power supply based at least in part on the calculated voltage set point. The gradient coil model is based at least in part on historical data acquired prior to the scan.

The present disclosure in some embodiments provides a method and an apparatus for processing MRI images wherein a plurality of slices of an object is applied with a spatial encoding gradient and a corrected gradient for applying a radial sampling, and radially sampled magnetic resonance signals of the slices are received, and MRI images are generated with the radial sampling applied over multi-bands.

Method for correcting the magnetic field gradient waveform in a magnetic resonance measurement including extracting an impulse response from the measured step response of a magnetic resonance system, determining the slew rate of the system during the step response measurement, modifying the desired output waveform such that the desired output waveform is constrained to within the slew rate and the bandwidth of the system, and determining the required pre-equalized input waveform.

In a method and a control sequence determination device for determining a magnetic resonance system control sequence includes at least one radio-frequency pulse train to be emitted by a magnetic resonance system, a target magnetization is acquired and a k-space trajectory is determined. A radio-frequency pulse train for the k-space trajectory is then determined in an RF pulse optimization method using a target function, wherein the target function includes a combination of different trajectory curve functions, of which at least one trajectory curve function is based on a trajectory error model. A method for operating a magnetic resonance system uses such a control sequence and a magnetic resonance system has such a control sequence determination device.

A power supply adjustment method may include: providing a pulse-width modulation (PWM) signal, a duty cycle of the PWM signal being preset to a fixed value; performing PWM processing on an input signal by using the PWM signal to obtain a first modulation signal;

performing first filtering processing on the first modulation signal to obtain a second modulation signal; and performing linear adjustment processing on the second modulation signal to output a target signal. According to the power supply adjustment method, the power supply apparatus, the portable component, and the magnetic resonance device provided in the present disclosure, interference of noise generated by PWM on the portable component can be reduced, thereby reducing requirements for a shielding component, further reducing a weight of the portable component in the magnetic resonance device and improving portability.

In some aspects, a magnetic system for use in a low-field MRI system. The magnetic system comprises at least one electromagnet configured to, when operated, generate a magnetic field to contribute to a B.sub.0 field for the low-field MRI system, and at least one permanent magnet to produce a magnetic field to contribute to the B.sub.0 field.

The present invention provides a gradient amplifier (300) for a magnetic resonance imaging system, comprising: a power amplifier (310) configured to supply a gradient coil current to a gradient coil (330); a passive filter (320) oupled to the power amplifier and configured to damp a harmonic component of the gradient coil current, wherein an oscillation current caused by oscillation of the passive filter (320) is present in the gradient coil current; and an active power filter coupled between the passive filter and the gradient coil and configured to generate a compensation current to compensate the oscillation current. Through incorporating an active power filter to compensate the oscillation current caused by the oscillation of the passive filter, the power consumption for attenuation of the oscillation current may be decreased prominently, the compensation result for the oscillation current may not be substantively affected by the variations of the gradient coil parameter, and reliability of the gradient amplifier is improved.

The present disclosure provides a system for MRI. The system may obtain MRI scan data of a subject by directing an MRI scanner to perform an MRI scan on the subject according to a first gradient waveform. The system may also determine a second gradient waveform based on the first gradient waveform and a gradient waveform determination model. The gradient waveform determination model may have been trained according to a machine learning algorithm. The system may further generate a target reconstruction image of the subject based on the second gradient waveform and the MRI scan data.

A gate driver unit is presented. The gate driver unit includes a first power exchanging coil operatively coupled to a power source. The gate driver unit includes a second power exchanging coil configured to receive power from the first power exchanging coil via a magnetic field and a field focusing element disposed between the first power exchanging coil and the second power exchanging coil and configured to focus the magnetic field onto the second power exchanging coil. The gate driver unit also includes a first circuit coupled to the second power exchanging coil. The gate driver unit includes a gate drive subunit operatively coupled to the first circuit and configured to provide an output signal to a control terminal corresponding to a controllable switch of a second circuit. A magnetic resonance imaging system and a method of contactless power transfer in a magnetic resonance imaging system are also presented.