Abstract: High-quality magnetic resonance (MR) recordings are triggered with movements of an object, for example the heartbeat. In a method and apparatus for obtaining raw data reconstruction for an MR image, a spin-echo-based sequence is executed that includes applying a static magnetic field and applying a magnetization pulse train. A movement of the object to be imaged is detected and a target contrast for two tissue types of the object is prespecified. The repetition time of the pulse train is set in dependence on the movement of the object to be imaged, and the flip angle is set such that prespecified target contrast for the two tissue types is obtained at the set repetition time.

Abstract: In a method for generating at least one MR image of an object in an MR system comprising a plurality of signal receiving coils, a sequence of RF pulses are applied in order to generate a plurality of MR signal echoes, the MR signal-echoes are detected with the plurality of signal receiving coils in a 3-dimension-al k-space, and the at least one MR image is reconstructed using the non-homogeneous under sampled 3-dimensional k-space based on a compressed sensing technology. The 3-dimensional k-space may be undersampled with a plurality of constant radii corkscrew trajectories having different radii resulting in a non-homogeneous undersampled 3-dimensional k-space.

Abstract: According to a method, first MR reference data and first MR imaging data are captured. Further MR imaging data is then captured. The capturing includes in each case generating at least one excitation pulse with a transmit coil of the magnetic resonance apparatus and irradiating the at least one excitation pulse into a patient receiving region, generating MR signals in a generation region using the at least one excitation pulse, and receiving the MR signals as MR data with a receive coil. A degree of difference that describes a difference between the generation region on capture of the first MR reference data and the generation region on capture of the further MR imaging data is determined. MR reference data is provided as a function of the degree of difference. An MR image is reconstructed based on the captured further MR imaging data and the provided further MR reference data.

Abstract: The disclosure relates to a method for correcting image data acquired by a magnetic resonance device, a magnetic resonance device, and a computer program product. According to the method, first navigator data, image data, and second navigator data are acquired. Moreover, temperature values of the magnetic resonance device are determined. The image data is corrected based on the first navigator data, the second navigator data, and the temperature values.

Abstract: A method for acquiring a magnetic resonance data set of an object under examination by a magnetic resonance system using a scan sequence is provided. The scan sequence includes a succession of sequence blocks, and in each sequence block, there is at least one sub-block including an excitation section and/or a detection section. An excitation section includes at least one excitation pulse, and in a detection section, an echo signal or an echo train is acquired as a scan signal. At least one item of motion information is provided for each sub-block. The motion information contains information about a movement of the object under examination within a duration of the sub-block. Some of the sub-blocks are automatically repeated. At least the sub-blocks having motion information that exceeds a threshold value are repeated. The threshold value defines a motion amplitude.

Abstract: Techniques are described for acquiring MR data comprising first MR data and second MR data of an examination object using an MR control sequence and a magnetic resonance device comprising an amplifier unit and an analog-to-digital converter (ADC).

Abstract: A method is for acquiring a magnetic resonance (MR) image dataset of at least two slices via simultaneous multi-slice excitation. An embodiment of the method includes executing an MR imaging sequence using multi-band radio-frequency excitation pulses to excite the at least two slices simultaneously in at least two repetitions, the repetitions each being executed according to a phase modulation scheme in which each of the simultaneously excited slices is assigned a phase and the phase of at least one of the simultaneously excited slices is changed from one repetition to the next, thereby acquiring an MR dataset of a collapsed image in each repetition; performing a spatial registration between the at least two collapsed images and performing motion correction on at least one of the MR datasets of the collapsed images; and reconstructing MR images of the at least two slices from the corrected MR datasets of the collapsed images.

Abstract: A system and method for performing a measuring sequence by a magnetic resonance device for examining a patient is provided. The performance of the measuring sequence includes a processing of segments. If at least one determined patient load value exceeds a predetermined limit value, the processing of the measuring sequence for the time frame of exceeding the patient load value is interrupted. The determination of the at least one patient load value includes a detection of a movement of a patient into a changed pose, an adjustment of at least one following segment to the changed pose of the patient, and a determination of at least one patient load value for the adjusted at least one following segment.

Abstract: A method for determining a saturation pulse for suppressing signals from unwanted areas in the context of acquiring measurement data from a target volume of an object under examination by means of a magnetic resonance system, includes: loading the characteristics of the unwanted areas from which signals are to be suppressed; determining area saturation pulses for signal suppression in each of the unwanted areas; and determining a saturation pulse for signal suppression in all the unwanted areas on the basis of the area saturation pulses determined.

Abstract: A method a for acquiring magnetic resonance data of an object under examination by means of a magnetic resonance system comprises: in an excitation phase, applying an RF excitation pulse; in a wait phase following the excitation phase, applying at least one first RF refocusing pulse after the applied RF excitation pulse according to a first echo spacing; in an acquisition phase following the wait phase, applying at least two further RF refocusing pulses to generate echo signals according to a second echo spacing, wherein the second echo spacing is smaller than the first echo spacing; and reading out the echo signals generated in the acquisition phase as magnetic resonance data from which image data can be reconstructed, wherein in the wait phase at least two spoiler gradients are switched in the readout direction.

Abstract: A rapid self-orienting personal defense device is provided having an elongate body, a stream channel, an orientation guide, a contact feature, and a contoured grip. The body defines an elongate storage cavity therein for retaining a replaceable repellant storage container. The orientation guide has a tip portion defining an index finger locator surface facing downward when gripped by the user for readily identifying to the user an intended grip location and orientation based on contact between the index finger with the locator surface. The contact feature can be attached to the tip portion of the orientation guide for providing defensive contact with an attacker and collecting a DNA sample during defensive contact. The contoured grip can have a grip diameter corresponding with the user. The orientation guide, locator surface and contoured grip can provide rapid self-orientation of the device when grabbed by the user.

Abstract: Techniques are disclosed for recording magnetic resonance data of an examination object with a magnetic resonance device. A magnetic resonance sequence is used to record the magnetic resonance data from at least two slices of a slice stack, and at least two temporally separate radio frequency pulses are output within an excitation time frame. A slice thickness of the slices, which is increased by an enlargement factor that is greater than one compared with a nominal slice thickness, is used for at least one, but not all, of the radio frequency pulses. The enlargement factor is selected as a function of a distance value describing the distance between two adjacent slices of the slice stack, such that the increased slice thickness does not result in the resulting excitation region of a slice extending into the adjacent slice.

Abstract: A method and an apparatus are provided for determining a valid parameter dataset for a protocol for an MRT examination by a MRT facility. The apparatus includes an input facility for importing a set of parameters to be used for performing the MRT examination; an interface for capturing at least one system value which represents an availability of a system resource for the MRT examination; a processor for calculating system resources required to perform the MRT examination using the imported parameters, and for executing a prepare function, which checks whether, with regard to the captured system values, the imported parameters are implementable in the MRT examination. If the parameters are not implementable, the processor is configured to calculate a modifying function for modifying the imported parameters based on the current system values and the required system resources and modify the imported parameters in accordance with the calculated modifying function.

Abstract: Techniques are disclosed for acquiring magnetic resonance data of an object with a magnetic resonance imaging apparatus. A slice group is imaged whose slices define a contiguous imaging volume and which contains a first number of slices. In a number of concatenations, the magnetic resonance data for subgroups of the slices, each containing a respective second number of slices depending on the first number of concatenations, are acquired, and shimming is performed to increase field homogeneity in the imaging volume. To define the subgroups, the imaging volume is subdivided into at least two disjoint contiguous sub-volumes, and at least two subgroups are defined for each sub-volume, each subgroup only containing non-adjacent slices in the sub-volume. During acquisition of the magnetic resonance data of each subgroup, shimming is at least restricted to the respective sub-volume.

Abstract: Acquisition of MR data with a compressed sensing technique in a volume section includes ascertaining an extent of magnetic field distortion within the volume section. A first gradient along a first direction is switched. An RF excitation pulse is radiated for selective excitation of a slice in the volume section while the first gradient is switched. The MR data is acquired in a volume of the volume section that is composed of the slice, a partial volume above the slice, and a partial volume below the slice by executing the following multiple times: switching a first phase-encoding gradient along a second direction; switching a second phase-encoding gradient along the first direction; and reading out the MR data in a k-space line while a readout gradient is switched along a readout direction. A set of k-space lines to be read out for the volume is determined in dependence on the extent.

Abstract: A correction method for reducing temperature-related deviations in a gradient response of an MR pulse sequence in MR imaging is provided. An MR pulse sequence that includes at least one nominal test gradient is run. A gradient response to the at least one nominal test gradient is repeatedly acquired by a magnetic field measurement in an examination region. A gradient system transfer function is determined based on the gradient response. A corrected MR pulse sequence is determined based on the gradient system transfer function and of the at least one nominal test gradient.

Abstract: In a method for recording measurement data, frequency-dependent parameters characterizing a gradient unit are loaded, a k-space trajectory planned for a MR measurement and having at least one frequency component is loaded, MR measurement data is acquired based on the planned k-space trajectory and reconstructing image data from the MR measurement data, wherein the planned k-space trajectory is corrected based on the at least one frequency component of the planned k-space trajectory and the frequency-dependent parameters, and an electronic signal representing the reconstructed image data is provided as an output of the MR system. The reconstructed image data may be stored and/or displayed. Advantageously, the correction can be employed flexibly for k-space trajectories with different frequency components.

Abstract: Techniques are disclosed relating to the generation of a magnetic resonance (MR) image of a predetermined portion of a volume of an examination object. MR data of the portion may be acquired using echo trains in a first step and in a second step, with each of the echo trains acquiring MR data of a plurality of k-space lines. The plurality of k-space lines extend parallel to one another and perpendicular to a common plane such that per k-space line, one intersection point within a plane results. The MR image is then reconstructed using the acquired MR data.

Abstract: In a method for detecting MR signals of an object in an MR scanner, in which the MR signals of the object are detected with receiving channels at the same time using a parallel imaging technique, where the MR signals are spin-echoes generated with a spin-echo based imaging sequence, a first magnetic field gradient (MFG) is applied in a slice selection direction (SSD) while applying an RF excitation pulse of the spin echo based imaging sequence, the first MFG having a first polarity during the application of the RF excitation pulse, a second MFG is applied in the SSD while applying at least a first RF refocusing pulse of the spin echo based imaging sequence, the second magnetic field gradient has a second polarity opposite to the first polarity, and the MR signals of the spin echo are detected to generate an MR image based on the detected MR signals.