Abstract: 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.

Abstract: Techniques are described for acquiring measurement data of an object under examination positioned in a magnetic resonance system using magnetic resonance with magnetization preparation. The techniques include performing a magnetization preparation block, applying at least two further preparation RF pulses, after the end of the magnetization preparation block, performing an acquisition block which comprises at least one further RF pulse and during which at least two echo signals are each acquired as measurement data, wherein at least one of the at least two echo signals is generated by the at least two further preparation RF pulses and the further RF pulse, and storing and/or further processing the acquired measurement data.

Abstract: A method for optimizing a pulse sequence includes acquiring a B0 map. A B1 map is acquired for each of at least one transmission channel of a magnetic resonance apparatus. Based on the acquired B0 map and at least one B1 map, a preliminary dynamic pulse is established. For each of the at least one transmission channel, the preliminary dynamic pulse includes a preliminary RF pulse. At least one optimization map is established based on the preliminary dynamic pulse. Each of the at least one optimization map describes a distribution of an optimization parameter resulting from the preliminary dynamic pulse. An initial pulse sequence is provided. An optimized pulse sequence is established based on the initial pulse sequence and the optimization map.

Abstract: In reconstruction, such as reconstruction in MR imaging, sub-sampled measurements from the scan are used in each iteration. By masking parts of the sub-sampled measurements (i.e., sub-sampling the acquired sub-sampled data) used in one or more iterations of reconstruction, banding is reduced or eliminated.

Abstract: A computer-implemented method for providing a control sequence to be used for establishing a target excitation state for a detection process of measurement data of an examination object with a magnetic resonance facility. The control sequence includes high frequency pulses to be output via transmission channels of a high frequency coil arrangement.

Abstract: A computer-implemented method for providing a drive sequence for a magnetic resonance device is provided. The drive sequence includes radiofrequency pulses to be output via transmit channels of a radiofrequency coil arrangement. The method includes, before the examination including the measurement procedure, precalculating a set of base sequences for mutually spaced reference points of at least one requirement parameter that describes the target excitation state. The reference points cover a parameter interval for use. The base sequences are provided together with the associated reference points at the magnetic resonance device. A measurement procedure value of the requirement parameter is provided at the magnetic resonance device. A drive sequence is ascertained for use for the measurement procedure.

Abstract: A method for calculating a set of optimized initial B1-shims for an MR measurement is provided. A B1-shim includes a vector of complex B1-shim coefficients, each coefficient representing a scaling factor for one element of a multi-element transmit coil. The method includes receiving a set of previously measured B1-maps for one or more body parts of various test subjects, calculating a set of B1-shims for a plurality of different field-of-views in the one or more body parts using an optimization algorithm, and identifying which B1-shim has the best performance for a group of field-of-views using the previously measured B1-maps. The B1-shim is optimized for that group of field-of-views to obtain an optimized initial B1-shim.

Abstract: A method for generating an imaging image dataset includes: acquiring a plurality of prescan raw datasets; generating a plurality of prescan single coil image datasets by reconstructing the one prescan raw dataset in each case; generating a combined prescan image dataset by combining the plurality of prescan single coil image datasets, wherein the generation of the combined prescan image dataset includes an establishment of a plurality of phase values, each of which is associated with an image element of the combined prescan image dataset; acquiring a plurality of imaging raw datasets, each with one of the plurality of coil elements; generating a plurality of imaging single coil image datasets by reconstructing the one imaging raw dataset in each case; and generating a combined imaging image dataset by combining the plurality of imaging single coil image datasets while taking account of the phase values of the combined prescan image dataset.

Abstract: The disclosure relates to a method for operating a magnetic resonance apparatus, to a magnetic resonance apparatus, and to a computer program product. According to the method, a pre-measurement is carried out by the magnetic resonance apparatus, wherein carrying out the pre-measurement includes acquiring pre-measurement data for the object under examination. The pre-measurement data is evaluated to ascertain evaluation information. The evaluation information is used to determine whether a B1 field map needs to be measured.

Abstract: The disclosure is directed to an Echo-Planar-Imaging (EPI) magnetic resonance imaging techniques combined with a variable-density undersampling scheme. The technique comprises generating an RF pulse, applying a switched frequency-encoding read out gradient in a variable time interval, and applying simultaneously an intermittently blipped low-magnitude phase-encoding gradient with a variable value of an integral of the phase-encoding gradient. The aforementioned steps are carried out such that the k-space is at least partially undersampled and the time interval of one read out gradient is varied depending on the integral of the phase encoding gradient, such that a ratio between the variable time interval of the read out gradient and the integral of the corresponding phase encoding gradient is kept above or at a predetermined constant value, which is related to a predetermined criteria of image quality.

Abstract: In a method for quantitative detection of parameters in MRI, first and second spoiled gradient echo images and at least one multi-echo steady-state first/second magnetization image are acquired; based on the extended phase graph theory, signal equations are obtained corresponding to the first and second spoiled gradient echo images, the at least one multi-echo steady-state first magnetization image and the at least one multi-echo steady-state second magnetization image; based on the signal equations of the first and second spoiled gradient echo images, the signal equation of the at least one multi-echo steady-state first magnetization image and the signal equation of the at least one multi-echo steady-state second magnetization image, a spoiled gradient echo proton density map, a multi-echo steady-state proton density map, a longitudinal relaxation time map and a transverse relaxation time map of the target tissue are obtained.

Abstract: A method and device for radio-frequency field inhomogeneity correction in magnetic resonance imaging. The method includes: obtaining a first MR image by scanning a target tissue using a first pulse sequence; obtaining a B1+ field map of the target tissue; obtaining a B1?: field map of the target tissue based on the first MR image and the B1+ field map; and performing B1 field inhomogeneity correction on a second MR image of the target tissue based on the B1+ field map and the B1? field map, where the second MR image is an MR image obtained after scanning of the target tissue using any imaging protocol and any pulse sequence.

Abstract: A method for providing magnetic field data includes receiving image data as input data of a trained function, and applying the trained function to the image data. The trained function is trained based on a data fidelity of image data corrected using the magnetic field data, and based on at least one assumption about at least one attribute of the magnetic field data. The method includes providing the magnetic field data as output data of the trained function.

Abstract: In a method for control, input magnetic field map data is received. In this case, the input magnetic field map data for at least one magnetic field type in each case describes a magnetic field map for a state that an examination object is in at an initial location in the MR apparatus. In this case, the estimated magnetic field map data for at least one magnetic field type in each case describes at least one magnetic field map for in each case a state that the examination object is in at an alternative location that is different compared to the initial location. Control data is determined by the system control unit, using the estimated magnetic field map data or using the input magnetic field map data and the estimated magnetic field map data. The control data is suitable for controlling the MR apparatus.

Abstract: The disclosure relates to techniques for perming chemical exchange saturation transfer (CEST) imaging correction. The present disclosure improves the speed of correcting CEST images.

Abstract: 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.

Abstract: A pulse-design unit for creating pulse data for controlling a magnetic resonance system includes a data interface configured for receiving an examination scheme, and a calculation module configured for generating pulse data based on an examination scheme. The pulse-design unit includes a data grid and/or parameter values created from map pairs of a plurality of patients and is configured to select and/or calculate pulse data using the data grid and/or parameter values and a provided examination scheme. A method and a control device for controlling a magnetic resonance imaging (MRI) system and a related magnetic resonance imaging system are also provided.

Abstract: In order to improve fat saturation in magnetic resonance technology (MRT) methods, a method for spectral saturation that includes specifying or ascertaining a first resonance frequency of a first substance and a first saturation frequency for a second substance is provided. A saturation pulse that causes no saturation of the first substance at the first resonance frequency is generated. The saturation pulse has a first spectral peak for saturation of the second substance at the first saturation frequency and a second spectral peak at a second saturation frequency. This allows a widening of a spectral saturation bandwidth of a dynamic saturation.

Abstract: In a method for monitoring absorption of a transmitter output irradiated into a patient by a transmitter unit of a magnetic resonance device, absorption data is provided, which describes a patient-nonspecific, location-dependent absorption sensitivity of the transmitter output to be irradiated. The patient is positioned in an irradiation region of the magnetic resonance device, in which the irradiation of the transmitter output into the patient is to take place. An anatomy of the patient is detected in the irradiation region, and the absorption data is assigned to the anatomy of the patient. A magnetic resonance scan of the patient is then performed, wherein the transmitter output absorbed by the patient is monitored during the magnetic resonance scan based on the absorption data assigned to the anatomy of the patient.

Abstract: The disclosure is directed to an Echo-Planar-Imaging (EPI) magnetic resonance imaging techniques combined with a variable-density undersampling scheme. The technique comprises generating an RF pulse, applying a switched frequency-encoding read out gradient in a variable time interval, and applying simultaneously an intermittently blipped low-magnitude phase-encoding gradient with a variable value of an integral of the phase-encoding gradient. The aforementioned steps are carried out such that the k-space is at least partially undersampled and the time interval of one read out gradient is varied depending on the integral of the phase encoding gradient, such that a ratio between the variable time interval of the read out gradient and the integral of the corresponding phase encoding gradient is kept above or at a predetermined constant value, which is related to a predetermined criteria of image quality.