Abstract: The disclosure relates to techniques for diffusion imaging of an examination region of a patient using a magnetic resonance facility. The technique may include specifying a number, which is at least two, of diffusion gradient pulse sequences for recording diffusion data sets using the magnetic resonance facility such that the diffusion gradient pulse sequences have a b-matrix that describes a planar diffusion encoding. The matrix may have precisely two intrinsic values that differ from zero. The technique may further include recording the diffusion data sets with the specified diffusion gradient sequences, and acquiring a trace-weighted image data set by geometric averaging of the at least two diffusion data sets. The diffusion gradient pulse sequences are determined such that the sum of all the b-matrices results in the unit matrix multiplied by a factor that characterizes the diffusion weighting (e.g. a predetermined b-value) and the number divided by three.

Abstract: In a method and magnetic resonance (MR) apparatus for acquiring MR data from a volume of an object in which first and second excitable spin types are present that differ in their Larmor frequencies by a chemical shift, an MR sequence with at least one radio-frequency pulse sequence selectively excites the first spin type or selectively suppresses MR signals of the second spin type. A B0 map describing the basic field distribution in a region of interest of the volume is established. First and second items of distribution information, which respectively describe the spectral distribution of Larmor frequencies of the first and second spin types, are derived from the B0 map. A pulse sequence parameter that describes the excitation spectrum of the radio-frequency pulse sequence is optimized based on the items of distribution information, with regard to a quality criterion that optimizes selective excitation and/or suppression.

Abstract: The disclosure relates to techniques for reducing eddy current-induced magnetic field interferences for a diffusion imaging pulse sequence. A gradient impulse response function (GIRF) is determined, and an interference gradient sequence (Gx/y/z(t)) is defined on the basis of the diffusion imaging pulse sequence. A time interval (t1, t2) is determined for the acquisition of diffusion image data. On the basis of the determined gradient impulse response function (GIRF) and the interference gradient sequence (Gx/y/z(t)), a time-dependent magnetic field deviation (?Bx/y/z(t)) in the determined time interval (t1, t2) is determined. An image distortion of an acquisition of diffusion imaging is compensated, which takes place by application of the diffusion imaging pulse sequence on the basis of the determined magnetic field deviation (?Bx/y/z(t)).

Abstract: The disclosure relates to a method for ascertaining a deviation of at least one gradient field of a magnetic resonance system from a reference. The method includes providing at least one first image data set and one second image data set of a phantom with isotropic diffusion properties, recorded with a diffusion-weighted imaging sequence, wherein the first image data set and the second image data set are recorded with different diffusion-weightings along a gradient direction to be tested of the gradient field using the magnetic resonance system. The method further includes ascertaining a map of apparent diffusion coefficients from the image data sets for at least a portion of the image points of the image data sets. The method further includes comparing the apparent diffusion coefficients with the reference.

Abstract: A method and system for determining a magnetic field map in a MR system based on position of a movable patient support of the MR system are provided, wherein a first resulting field map including position dependent information about a magnetic field distribution in a homogeneity volume including an examination volume of the MR system is provided when the movable patient support is located at a first position, wherein a stationary field map including information about a magnetic field distribution in the homogeneity volume is provided, which is independent of the position of the movable patient support, wherein a position dependent field map including information about a magnetic field distribution in the homogeneity volume mainly influenced by a position of the movable patient support is determined using the stationary field map and the first resulting field map, and wherein a second resulting field map in the homogeneity volume is determined when the movable patient support is located at a second position di

Abstract: In a method and apparatus for determination of phase distributions in MR imaging, a measured phase distribution of the region of interest is combined with at least one second phase value to form a combination-phase distribution, wherein the phase values of the combination-phase distribution are restricted to a defined presentation interval. A correction-phase distribution is generated, based on a known magnetic field distribution in the region of interest. The phase values thereof are not restricted to the defined presentation interval. A corrected combination-phase distribution is generated using the correction-phase distribution and the combination-phase distribution, in which the phase values are restricted to the defined presentation interval. An absolute combination-phase distribution is generated from the corrected combination-phase distribution, in which the phase values are not restricted to the defined presentation interval.

Abstract: In a method for providing setting parameter sets for at least one measuring protocol described by protocol parameters for acquiring magnetic resonance data with a magnetic resonance facility, setting parameter set is determined for each of at least two temperature status categories of the magnetic resonance facility using a temperature model describing a development of a temperature status of at least one component of the magnetic resonance facility. The method also includes preventing overheating of the at least one component due to the measurement with the measuring protocol being repeated a maximum number of times for a specified number of repetitions.

Abstract: Method for optimizing a chronological sequence in an MR control sequence according to which a magnetic resonator having a gradient coil unit including first and second gradient coils and a cooling layer is controllable. The MR control sequence has a first and second sequence modules configured to control the first and second gradient coils, respectively. The method comprises detecting a property including a cooling power of the cooling layer for the first gradient coil or the second gradient coil, or a feature which is representative of a chronologically preceding use of the gradient coil unit; determining a first requirement of the first sequence module on the first gradient coil; determining a second requirement of the second sequence module on the second gradient coil; and optimizing the chronological sequence in the first and second sequence module by taking into account the property and the first and second requirements.

Abstract: A method for setting an operating parameter of a medical device is provided. The method includes determining a current operating mode of the medical device. A time span available for setting the operating parameter is derived from the determined current operating mode. A setting range of the operating parameter necessary for fulfilling a pre-determined criterion is determined. A setting time necessary for setting the operating parameter according to the determined setting range is determined, and the operating parameter is set according to the setting range, provided the time span available for the setting is at least as long as the necessary setting time.

Abstract: In a magnetic resonance measurement sequence, an inversion pulse is applied that acts on a longitudinal magnetization of a first spin species and a second spin species, for example on a water portion and a fat portion. An excitation pulse is applied after a predetermined time period. At least one manipulation pulse is subsequently applied, respectively with associated gradient pulse.

Abstract: A flexibly and universally applicable method for simultaneous multi-slice nuclear spin tomography is provided. Thereby, a pulse space region to be sampled is specified by means of a processor, wherein a first pulse space dimension (ky) is assigned to a first phase-encoded axis and a second pulse space dimension (kz) is assigned to a second phase-encoded axis and the second phase-encoded axis corresponds to a slice axis. An undersampling scheme is specified by means of the processor, wherein along the second pulse space dimension (kz), an incomplete sampling is provided. Then, a magnetic resonance scan is carried out within the pulse space region to be sampled according to the undersampling scheme and according to respective phase-encodings of the first and second phase-encoded axis.

Abstract: A system and method for simultaneous multi-slice nuclear spin tomography is provided which requires no sensitivity profile of a receiving coil along a slice axis. A pulse space region to be sampled can be specified. A first pulse space dimension (ky) can be assigned to a first phase-encoded axis and a second pulse space dimension (kz) can be assigned to a second phase-encoded axis and the second phase-encoded axis corresponds to the slice axis. A sampling scheme can also be specified, and a complete sampled can be provided along the second pulse space dimension (kz). A magnetic resonance scan can then be carried out within the pulse space region to be sampled based on the sampling scheme and respective phase-encodings of the first and second phase-encoded axis.

Abstract: In a method and magnetic resonance (MR) apparatus or optimizing a time progression of an MR control sequence that operates an MR scanner of the MR apparatus so as to execute at least two sequence modules, a property of a component of the magnetic resonance apparatus is detected, and a first requirement of the component is determined for a first sequence module of the at least two sequence modules. A second requirement of the component is detected for a second sequence module of the at least two sequence modules. The time progression of the at least two sequence modules is optimized, taking account of the property, the first requirement and second requirement.

Abstract: In an acquisition of magnetic resonance (MR) data from a volume portion of an object, a set of a number of planned volume elements is predefined in the volume portion, wherein MR data are to be acquired from each of the planned volume elements. Furthermore, conditions that are to be fulfilled in the acquisition of the MR data of the planned volume elements are predefined. Dependent upon the planned volume elements and the conditions, a set of additional volume elements is determined. The MR data are acquired from at least two volume elements simultaneously, the at least two volume elements including one volume element from the set of the planned volume elements and one volume element from the set of the additional volume elements.

Abstract: A method for operating a magnetic resonance device is provided. The magnetic resonance device includes a component that has an operating limit in relation to a state parameter. The component uses a protocol to record magnetic resonance data. The protocol includes a magnetic resonance sequence and is described by protocol parameters. A protocol parameter set that, in relation to a protocol section, allows the protocol section to be repeated as often as desired without exceeding the operating limit is provided or determined. The method includes receiving a boost parameter from a user interface. At least for the protocol section, adaptation parameters are determined at least partially automatically based on the boost parameter, such that the desired number of repetitions described by the boost parameter is established while complying with the operating limit. Magnetic resonance data is recorded with the protocol using the determined adaptation parameters.

Abstract: A method for operating a medical diagnostic system that is configured to use a system component of the diagnostic system to generate examination data of a person under examination during an examination procedure is provided. The examination procedure with control of the system component is controlled by a piece of control software, and a component driver exchanges control commands of the control software with the system component in order to control the system component. The method includes providing an event driver that communicates with the control software via an interface of the control software. Via the event driver, a first event is detected in the examination procedure and reported to the event driver. When the first event is detected in the examination procedure, the use of the system component in the examination procedure is modified to a first type defined by the event driver.

Abstract: In a method and computer and magnetic resonance (MR) apparatus for classifying MR measurement data acquired from an object under examination by execution of an MR fingerprinting method, wherein the MR measurement data include multiple MR signal profiles acquired by the MR fingerprinting method. At least one texture parameter is derived from the MR measurement data. The MR measurement data are classified into at least one tissue class using the at least one texture parameter. The classified MR measurement data are provided as an output.

Abstract: In a method and magnetic resonance (MR) apparatus for generating an approximated trace-weighted MR image of a subject, at least three diffusion-weighted MR images of the subject are created, based on different diffusion encoding directions and diffusion gradient fields with essentially equal diffusion encoding strengths. A weighting factor is determined by an optimization method based on spatial inhomogeneities of the diffusion gradient fields for each image point of the at least three diffusion-weighted MR images. Based on the weighting factors, the at least three diffusion-weighted MR images are combined to generate the approximated trace-weighted MR image. Furthermore, an ADC map is determined based on approximated trace-weighted images and the effective diffusion encoding strength. Furthermore, a trace-weighted MR image is synthesized with nominal diffusion encoding strength based on a trace-weighted image with effective diffusion encoding strength.

Abstract: Systems and methods are provided for determining a use of a system component in an imaging system. The imaging system includes a primary side configured to provide power to the system component and a secondary side including the system component that uses the power provided by the primary side during the image sequence. The method includes determining the use of the system component during an imaging sequence, determining a time averaged power provided by the primary side during the imaging sequence, determining a maximum time averaged power that may be provided by the primary side until a temperature limit is reached on the primary side. Further, whether the time averaged power is smaller than the maximum time averaged power is determined.

Abstract: The present disclosure relates to an imaging system for creating an image of an examination object comprising a system component and a control component. The system component has a component property that is able to assume a value in a first value range established by the imaging system. A corresponding system component of another imaging system comprises a corresponding component property with another value range with an overlap range with the first value range. The control component is embodied to control the use of the system component on the creation of the image, wherein the control component can be operated in a compatibility mode. In the compatibility mode, the control component is configured, on the creation of the image, to only allow values that lie within the overlap range for the component property of the system component.