A system and method for performing accelerated k-space shift correction calibration scans for non-Cartesian trajectories is provided. The method can include applying an MRI sequence, performing a calibration scan based on the MRI sequence using the non-Cartesian trajectory to acquire k-space shift data, wherein one or more partitions are skipped during the calibration scan, interpolating the skipped one or more partitions using the k-space shift data from adjacent partitions, and calibrating the MRI system using the k-space shift data and the interpolated k-space shift data. In some embodiments, an acceleration factor Acc can be defined and the calibration scan acquires k-space shift data for only one partition in every Acc partitions.

The present disclosure relates to a computer implemented diffusion magnetic resonance method for determining a diffusion parameter for spin-labelled particles in a specimen. The method (100) comprises providing (110) a specimen and a magnetic resonance device arranged to measure magnetic resonance in said specimen; applying (120) at least one magnetic field gradient pulse sequence to said specimen, thereby spin-labelling a set of particles comprised in said specimen; obtaining (130) magnetic resonance measurement data corresponding to said at least one magnetic field gradient pulse sequence for said spin-labelled particles with said magnetic resonance device; determining (140) at least one diffusion parameter for said spin-labelled particles based on said obtained measurement data; wherein determining (140) said at least one diffusion parameter comprises forming for each diffusion parameter at least one Fourier transform representing said diffusion parameter based on said obtained measurement data; and wherein each magnetic field gradient pulse sequence comprises at least three gradient pulses wherein at least one gradient pulse is configured to introduce a phase shift in said spin-labelled particles based on their position in said specimen.

The present disclosure relates to a computer implemented diffusion magnetic resonance method for determining a diffusion parameter for spin-labelled particles in a specimen. The method (100) comprises providing (110) a specimen and a magnetic resonance device arranged to measure magnetic resonance in said specimen; applying (120) at least one magnetic field gradient pulse sequence to said specimen, thereby spin-labelling a set of particles comprised in said specimen; obtaining (130) magnetic resonance measurement data corresponding to said at least one magnetic field gradient pulse sequence for said spin-labelled particles with said magnetic resonance device; determining (140) at least one diffusion parameter for said spin-labelled particles based on said obtained measurement data; wherein determining (140) said at least one diffusion parameter comprises forming for each diffusion parameter at least one Fourier transform representing said diffusion parameter based on said obtained measurement data; and wherein each magnetic field gradient pulse sequence comprises at least three gradient pulses wherein at least one gradient pulse is configured to introduce a phase shift in said spin-labelled particles based on their position in said specimen.

At least one example embodiment provides a magnetic resonance imaging system comprising at least one local radiofrequency (RF) coil; and at least one marker element, wherein the magnetic resonance imaging system is configured to activate the at least one marker element and deactivate the at least one marker element such that the at least one marker element is detectable by the magnetic resonance imaging system at a position relative to the at least one local RF coil if the at least one marker element is activated, and the at least one marker element is not detectable by the magnetic resonance imaging system if the at least one marker element is deactivated.

Disclosed herein is a position detection marker that includes a magnetic field source that generates magnetism, an MRI marker that can be detected by a magnetic resonance imaging method, and a holding part that fixes a relative positional relation between the magnetic field source and the MRI marker.

Disclosed herein is a position detection marker that includes a magnetic field source that generates magnetism, an MRI marker that can be detected by a magnetic resonance imaging method, and a holding part that fixes a relative positional relation between the magnetic field source and the MRI marker.

A method of measuring a specific absorption rate (SAR) of a hip joint implant using magnetic resonance imaging (MRI), includes: arranging the hip joint implant in a human lower body-shaped phantom; arranging an electric field sensor around the hip joint implant; providing radio frequency (RF) energy according to an MRI sequence to the human phantom; and calculating the SAR of the hip joint implant from strength of an electric field measured by the electric field sensor.

According to some aspects, a method of suppressing noise in an environment of a magnetic resonance imaging system is provided. The method comprising estimating a transfer function based on multiple calibration measurements obtained from the environment by at least one primary coil and at least one auxiliary sensor, respectively, estimating noise present in a magnetic resonance signal received by the at least one primary coil based at least in part on the transfer function, and suppressing noise in the magnetic resonance signal using the noise estimate.

According to some aspects, a method of suppressing noise in an environment of a magnetic resonance imaging system is provided. The method comprising estimating a transfer function based on multiple calibration measurements obtained from the environment by at least one primary coil and at least one auxiliary sensor, respectively, estimating noise present in a magnetic resonance signal received by the at least one primary coil based at least in part on the transfer function, and suppressing noise in the magnetic resonance signal using the noise estimate.

An apparatus and method for imaging quality assessment of an imaging system employs an aggregate phantom and a processor for imaging analysis. The aggregate phantom includes a plurality of self-contained sections configured to be moved independently and re-assembled in the imaging system. Each section includes fiducial features of known relative location. The processor: quantitatively determines location of the fiducial features within an image of the aggregate phantom; compares the determined location within the image to the known relative location of the fiducial features to produce a distortion field; and distinguishes between actual geometric distortion of the imaging system and rigid-body transformations of sections of the aggregate phantom, in the distortion field. For extended fields-of-view, the aggregate phantom may be repositioned, and sets of images combined to determine a distortion field of the extended image. A method employing virtual features for measuring spatial uniformity of an acquired signal, is also provided.