A composite pulse sequence that causes a series of magnetic moment rotations that, in combination, are equivalent to a pulse sequence that would cause a single rotation having a target desired rotation angle α is described. The composite pulse sequence involves a plurality of pulses which each individually have a desired rotation (A°, B° etc) that is less than the target desired rotation α°. The pulses each cause a rotation about respective axes, that may be orthogonal to each other. Slice selection magnetic gradients can be employed to make the component rotations of the composite pulse slice selective.

The disclosure relates to a magnetic resonance tomography scanner and to a method for operating the magnetic resonance tomography scanner. The method includes determining a B0 field map. The method further includes determining an excitation of the nuclear spins to be achieved and a spectrally selective excitation pulse for transmission by a transmitter by way of an antenna as a function of the B0 field map. In the method, the excitation pulse is configured here to generate the excitation of the nuclear spins to be achieved in the patient. The excitation pulse is then output by way of the antenna.

Nuclear spins are excited in a region of interest in an object under examination by a radio-frequency pulse. During at least one phase of the radio-frequency pulse, excitation fields are transmitted while magnetic field gradients are simultaneously applied so that the magnetization of the nuclear spins moves on a trajectory through a transmission k-space. In a first phase of the at least one phase of the radio-frequency pulse, the trajectory moves at a radial distance around the center of the transmission k-space. The radial distance corresponds to the radius of a sphere superimposed with at least one radial harmonic.

According to some aspects, a magnetic resonance imaging system capable of imaging a patient is provided. The magnetic resonance imaging system comprising at least one B0 magnet to produce a magnetic field to contribute to a B0 magnetic field for the magnetic resonance imaging system and a member configured to engage with a releasable securing mechanism of a radio frequency coil apparatus, the member attached to the magnetic resonance imaging system at a location so that, when the member is engaged with the releasable securing mechanism of the radio frequency coil apparatus, the radio frequency coil apparatus is secured to the magnetic resonance imaging system substantially within an imaging region of the magnetic resonance imaging system.

The disclosed embodiments provide a method for acquiring MR data at resolutions down to tens of microns for application in in vivo diagnosis and monitoring of pathology for which changes in fine tissue textures can be used as markers of disease onset and progression. Bone diseases, tumors, neurologic diseases, and diseases involving fibrotic growth and/or destruction are all target pathologies. Further the technique can be used in any biologic or physical system for which very high-resolution characterization of fine scale morphology is needed. The method provides rapid acquisition of signal at selected values in k-space, with multiple successive acquisitions at individual k-values taken on a time scale on the order of microseconds, within a defined tissue volume, and subsequent combination of the multiple measurements in such a way as to maximize SNR. The reduced acquisition volume, and acquisition of only signal values at select places in k-space, along selected directions, enables much higher in vivo resolution than is obtainable with current MRI techniques.

A magnetic resonance imaging apparatus according to an embodiment includes sequence controlling circuitry and processing circuitry. The sequence controlling circuitry performs a first acquisition and a second acquisition, the first acquisition including executing a preparation module corresponding to a first Echo Time (TE) value and subsequently performing an acquisition sequence, the second acquisition including executing the preparation module corresponding to a second TE value different from the first TE value and subsequently performing the acquisition sequence, the acquisition sequence being a pulse sequence including applying an RF excitation pulse in presence of a gradient magnetic field, and subsequently applying an RF re-focusing pulse in presence of another gradient magnetic field having an opposite polarity to that of the gradient magnetic field. The processing circuitry extracts at least one of a signal related to a first fat and a signal related to a second fat.

A system and method for compensation of radiofrequency (RF) spatial encoding misalignment errors due to gradient non-linearity in magnetic resonance imaging is described. The true magnetic field produced by the gradient coils in space are taken into account in order to encode the appropriate frequency band and offset of the RF pulse corresponding to the desired spatial encoding position and thickness. This method is applicable to any positionally (frequency) encoded radiofrequency (RF) pulses including slice or slab excitation pulses, inversion pulses, spin echo (refocusing) pulses and spatial saturation pulses.

An imaging apparatus has an MRT system with an MR receiving antenna configured to receive a first receive signal containing an MR signal from an object to be examined during an examination period. The imaging apparatus includes a modality for examining the object and/or for acting on the object via mechanical or electromagnetic waves, wherein the modality has an electronic circuit. The imaging apparatus includes an auxiliary antenna arranged and configured to receive a second receive signal containing an interference signal generated by the electronic circuit during the examination period. The imaging apparatus has a processing system configured to suppress interference in the first receive signal based on the first and the second receive signal.

The present disclosure relates to an MRI system and a method and device for determining a waveform of oblique scanning. Specifically, provided are a magnetic resonance imaging system, a method and device for determining a gradient waveform of oblique scanning, and a computer-readable storage medium. The method includes: generating an initial physical axis gradient waveform on a physical axis, the physical axis including a first physical axis, a second physical axis, and a third physical axis, wherein gradient waveforms on the three physical axes have the same inflection time; converting the initial physical axis gradient waveform into a logical axis gradient waveform, an inflection point of the logical axis gradient waveform being the same as the inflection time of the initial physical axis gradient waveform; re-converting the logical axis gradient waveform into a physical axis gradient waveform; and using, during the oblique scanning of magnetic resonance imaging, the converted physical axis gradient waveform to drive a gradient amplifier.

Disclosed herein is a medical system comprising a memory storing machine executable instructions. The medical system further comprises a computational system. The execution of the machine executable instructions causes the computational system to: receive k-space data descriptive of a region of interest of a subject, wherein the k-space data is acquired using a magnetic resonance fingerprinting pulse sequence configured for encoding chemical shifts; receive fat peak weights descriptive of a magnetic resonance fat spectrum, wherein the fat peak weights are matched to a pulse train of the magnetic resonance fingerprinting pulse sequence; and reconstruct a quantitative magnetic resonance image from the k-space data and the fat peak weighs.