The invention provides for a medical imaging system (100, 300, 400) comprising a memory (110) containing machine executable instructions (120) and a processor (106). Execution of the machine executable instructions cause the processor to: receive (200) a magnetic resonance image (300), receive (202) meta data descriptive of the magnetic resonance image, wherein the metadata comprises reference gray scale value data (124) for two or more tissue types; and segment (204) the magnetic resonance image using an image segmentation algorithm (126) that uses the reference gray scale value data.

The invention provides for a magnetic resonance imaging system (100) which comprise a magnet (104) and a magnetic field gradient generator (110, 112) for generating a gradient magnetic field within an imaging zone (108). The gradient magnetic field is aligned with a predetermined direction. The magnetic resonance imaging system further comprise a memory (134, 136) for storing machine executable instructions (150, 152, 154), a pre-calculated magnetic resonance fingerprinting dictionary (144), and pulse sequence instructions (140). The pulse sequence instructions cause the magnetic resonance imaging system to acquire the magnetic resonance data according to a magnetic resonance fingerprinting technique. The magnetic resonance fingerprinting technique encodes the magnetic resonance data as slices (125). The pre-calculated magnetic resonance fingerprinting dictionary contains a listing of calculated magnetic resonance signals in response to execution of the pulse sequence instructions for a set of predetermined substances. Execution of the machine executable instructions causes a processor (130) controlling the magnetic resonance imaging system to: acquire (300) the magnetic resonance data by controlling the magnetic resonance imaging system with pulse sequence instructions; divide (302) the magnetic resonance data into a set of slices; calculate (304) the abundance of each of the set of predetermined substances within each of the set of slices by comparing the magnetic resonance data for each of the set of slices with the pre-calculated magnetic resonance fingerprinting dictionary; and calculate (306) a magnetic resonance fingerprint chart by plotting abundance of each of the set of predetermined substances within each of the set of slices as a function of position along the predetermined direction.

In a method and magnetic resonance (MR) apparatus for combined multislice fingerprinting MR imaging, for each repetition of a repetition sequence, radio-frequency excitation pulses are radiated with flip angles of the radio-frequency excitation pulses being different from one another, at least for a few repetitions. The scattering of the local maxima of the sum of the radio-frequency energy of the radio-frequency excitation pulses as a function of the repetition over the repetition sequence is for example not greater than 80%.

A method for producing an image of a subject using a magnetic resonance imaging (MRI) system includes acquiring a series of echo signals by sampling k-space along radial lines that each pass through the center of k-space. Each projection of the radial lines is divided into multiple echoes and successive projections are spaced by a predetermined angular distance. The series of echo signals are reconstructed into a plurality of images, wherein each image corresponds to a distinct echo signal.

An eddy-current correction method and apparatus, a mobile terminal and a readable storage medium are provided. The method includes: step S1: reading gradient-recalled echo sequence by means of bipolarity, so as to acquire a multi-echo image; step S2: estimating a first-order term coefficient of an extra phase term introduced by an eddy-current in the acquired multi-echo image; step S3: removing the estimated first-order term coefficient, and estimating a zero-order term coefficient of the extra phase term introduced by the eddy-current in the collected multi-echo image; step S4: removing, according to the estimated first-order term coefficient and the zero-order term coefficient, an error of the extra phase term introduced by the eddy-current. The eddy-current correction method removes the phase error caused by the eddy-current in the acquired image, thereby ensuring the correctness of the subsequent water-fat separation algorithm result.

The invention relates to a method of CEST or APT MR imaging of at least a portion of a body (10) placed in a main magnetic field B.sub.0 within the examination volume of a MR device. The method of the invention comprises the following steps: •a) subjecting the portion of the body (10) to a saturation RF pulse at a saturation frequency offset; •b) subjecting the portion of the body (10) to an imaging sequence comprising at least one excitation/refocusing RF pulse and switched magnetic field gradients, whereby MR signals are acquired from the portion of the body (10) as spin echo signals; •c) repeating steps a) and b) two or more times, wherein the saturation frequency offset and/or a echo time shift in the imaging sequence are varied, such that a different combination of saturation frequency offset and echo time shift is applied in two or more of the repetitions; •d) reconstructing a MR image and/or B.sub.0 field homogeneity corrected APT/CEST images from the acquired MR signals. Moreover, the invention relates to a MR device (1) for carrying out the method of the invention and to a computer program to be run on a MR device.

Exemplary system, method and computer accessible medium can be provided for evaluating at least one radio frequency transmitting arrangement. For example, it is possible to receive a first information associated with at least one scan of at least one live subject corresponding to one or more effects of the transmitting arrangement(s) on the at least one live subject, and determine a second information based on the first information.

The estimation accuracy of a magnetic susceptibility value of tissue is improved by computing an edge image which represents the edge of the tissue on a magnetic susceptibility distribution and to reduce background noise without lowering the magnetic susceptibility value of the tissue. The present invention computes an absolute value image and a phase image from a complex image obtained by MRI, from the phase image, computes a low frequency region magnetic susceptibility image in which background noise is greater than a desired value, computes an edge information magnetic susceptibility image and computes a high frequency region magnetic susceptibility image, computes an edge mask from the edge information magnetic susceptibility image, smooths a magic angle region from the edge mask and the low frequency region magnetic susceptibility image and finally smooths a high frequency region using the high frequency region magnetic susceptibility image.

The invention provides for a magnetic resonance imaging system (100) for acquiring magnetic resonance data (142) from a subject (118). The magnetic resonance imaging system comprises a processor (130) for controlling the magnetic resonance imaging system. The execution of the instructions causes the processor to control (200) the magnetic resonance imaging system with the pulse sequence data to acquire the magnetic resonance data. The pulse sequence data comprises commands for acquiring the magnetic resonance data using an n point Dixon magnetic resonance imaging method. The execution of the instructions causes the processor to construct (202) two phase candidate maps (144, 146) using the magnetic resonance data according to the n point Dixon magnetic resonance imaging method; divide (204) each of the set of voxels into a set of object voxels (148); identify (206) a set of boundary voxels (152) and interior voxels within the set of object voxels; create (208) a chosen phase candidate map (154) in the memory; select (210) a chosen phase map value for at least a portion of the set of boundary voxels in the chosen phase map from the two phase candidate maps by selecting the candidate phase map value which indicates the lowest fat to water ratio; and calculate (212) the phase map value of the object voxels according to a phase candidate selection algorithm.

In a method and apparatus for recording a magnetic resonance data set, an MR data acquisition scanner is operated to acquire a range of basic values of a material parameter of a subject, with a basic resolution within a region of the subject. Thereafter, the aforementioned resolution is refined by selecting a refinement acquisition sequence, dependent on a material property to be refined, and then again operating the scanner to acquire further values for the refinement material parameter with a refined resolution, compared to the original resolution.