A magnetic resonance imaging (MRI) apparatus, including a radio frequency (RF) transmitter configured to transmit a plurality of excitation RF pulses to an object, and to transmit a refocusing RF pulse to the object within a repetition time (TR) period after transmitting the plurality of excitation RF pulses; and a controller configured to control the RF transmitter to transmit a plurality of first additional gradient magnetic fields corresponding to the plurality of excitation RF pulses in order to spoil a plurality of free induction decay (FID) signals produced by the plurality of excitation RF pulses, and to transmit a plurality of second additional gradient magnetic fields corresponding to the plurality of excitation RF pulses in order to generate a plurality of spin echo signals corresponding to the spoiled plurality of FID signals; and an RF receiver configured to acquire the generated plurality of spin echo signals.

Determining parameter values in image points of an examination object in an MR system by an MRF technique. Comparison signal waveforms, established using predetermined recording parameters, and each assigned to predetermined values of the parameters to be determined, are loaded. An image point time series of the examination object is acquired with an MRF recording method such that the acquired image point time series are comparable with the loaded comparison signal waveforms. A signal comparison of a section of the respective signal waveform of the acquired one image point time series is carried out with a corresponding section of loaded comparison signal waveforms to establish similarity values. The values of the parameters to be determined on the basis of the most similar comparison signal waveforms determined are determined, and then stored or output.

Provided in the present application are a magnetic resonance imaging system, a positioning method of an implant therefor, and a non-transitory computer-readable storage medium. The positioning method of the implant for the magnetic resonance imaging system includes: executing a first scanning sequence to obtain original image data and reconstructing an edge image of the implant on the basis of the original image data. The first scanning sequence includes: a radio frequency excitation pulse and a first layer selection gradient pulse corresponding to the radio frequency excitation pulse, the frequency of the radio frequency excitation pulse having a preset offset relative to a center frequency; and a radio frequency refocusing pulse and a second layer selection gradient pulse corresponding to the radio frequency refocusing pulse, the direction of the second layer selection gradient pulse being opposite to the direction of the first layer selection gradient pulse.

A magnetic resonance imaging (MRI) system and method for acquiring magnetic resonance (MR) images using a pulse sequence implementing driven equilibrium and quadratic phase cycling techniques is provided. The method includes, during a pulse repetition period of a pulse sequence and using a quadratic phase cycling scheme, applying a first RF pulse to deflect a net magnetization vector associated with the subject from a longitudinal plane into a transverse plane; after applying the first RF pulse, applying a first sequence of RF pulses each of which flips the net magnetization vector by approximately 180 degrees within the transverse plane; and after applying the first sequence of RF pulses, applying a second RF pulse to deflect the net magnetization vector from the transverse plane to the longitudinal plane.

According to one embodiment, a data processing apparatus includes processing circuitry. The processing circuitry acquires input data relating to a processing target including a plurality of data segments corresponding respectively to a plurality of imaging contrasts determined by a first pulse sequence. The processing circuitry generates output data relating to the processing target by applying a trained model to input data relating to the processing target. The processing circuitry outputs output data relating to the processing target.

A method of mapping transverse relaxation in a magnetic resonance (MR) scan data, comprises receiving a multi-echo spin-echo MR scan protocol comprising a plurality of MR imaging parameters, and for each echo of the multi-echo spin-echo MR scan protocol: generating, based on the parameters, a simulated echo modulation curve using a set of refocusing coherence pathways, for each of a plurality of predetermined transverse relaxation times; calculating, for each transverse relaxation time, diffusion attenuation based on a respective subset of the refocusing coherence pathways; and correcting the echo modulation curve using the diffusion attenuation. The method can also comprise comparing the scan data to the corrected echo modulation curve for each of at least a portion of the transverse relaxation values, and generating a displayed output comprising a map of transverse relaxation based on the comparison.

A method of mapping transverse relaxation in a magnetic resonance (MR) scan data, comprises receiving a multi-echo spin-echo MR scan protocol comprising a plurality of MR imaging parameters, and for each echo of the multi-echo spin-echo MR scan protocol: generating, based on the parameters, a simulated echo modulation curve using a set of refocusing coherence pathways, for each of a plurality of predetermined transverse relaxation times; calculating, for each transverse relaxation time, diffusion attenuation based on a respective subset of the refocusing coherence pathways; and correcting the echo modulation curve using the diffusion attenuation. The method can also comprise comparing the scan data to the corrected echo modulation curve for each of at least a portion of the transverse relaxation values, and generating a displayed output comprising a map of transverse relaxation based on the comparison.

A method for generating an image data set of an image area located in a measurement volume of a magnetic resonance system comprising a gradient system and an RF transmission/reception system, comprises the following method steps: —reading out k-space corresponding to the imaging area, by: (a) activating a frequency encoding gradient in a predetermined spatial direction and with a predetermined strength G.sub.0 by means of said gradient system, (b) after the activated frequency encoding gradient achieves its strength G.sub.0, radiating a non-slice-selective RF excitation pulse by means of said RF transmission/reception system, (c) after a transmit-receive switch time Δt.sub.TR following the radiated excitation pulse, acquiring FID signals with said RF transmission/reception system and storing said FID signals as raw data points in k-space along a radial k-space trajectory that is predetermined by the direction and strength G.sub.0 of the frequency encoding gradient, (d) repeating (a) through (c) with respectively different frequency encoding gradient directions in each repetition until k-space corresponding to the image area is read out in an outer region of k-space along radial k-space trajectories, said radial k-space trajectories each having a radially innermost limit k.sub.gap which depends on said switch time Δt.sub.TR, (e) reading out a remainder of k-space that corresponds to the imaging area, said remainder being an inner region of k-space not being filled by said first region and including at least a center of k-space, in a read out procedure that is different from (a) through (d), and storing all data points read out in (d) and (e); and —reconstructing image data from the read out data points in k-space by implementing a reconstruction algorithm; In order to constrain image fidelity and optimize scan duration under given circumstances, the inner k-space region is subdivided into a core region and at least one radially adjacent shell region.

Systems and methods include conversion of a first frame of k-space data acquired using a first initial readout polarity to first hybrid (k.sub.x, y)-space data, conversion of a second frame of k-space data acquired using a second initial readout polarity to second hybrid (k.sub.x, y)-space data, determination of a relationship between phase difference and y-position based on phase differences between a plurality of pixels located at k.sub.x=a of first hybrid (k.sub.x, y)-space data and a plurality of pixels at k.sub.x=b of second hybrid (k.sub.x, y)-space data, where a and b are constants, modification of the second hybrid (k.sub.x, y)-space data based on the relationship, conversion of the modified second hybrid (k.sub.x, y)-space data to a modified second frame of k-space data, generation of two single-polarity readout k-space frames based on the first frame of k-space data and the modified second frame of k-space data, and correction of a third frame of EPI image data based on the two single-readout polarity k-space frames.

Techniques are provided for performing three-dimensional diffusion weighted magnetic resonance imaging. A diffusion gradient is applied by controlling a gradient coil arrangement of an MRI system and, during an acquisition period after the application of the diffusion gradient, a readout gradient is applied by controlling the gradient coil arrangement and MR data is acquired. For applying the readout gradient, the gradient coil arrangement is controlled such that the MR data is acquired at least along a trajectory segment of a three-dimensional k-space trajectory, wherein a k-space center is sampled by the trajectory segment multiple times during the acquisition period.