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: Techniques are described for generating an MR image of an object using a multi spin-echo based imaging sequence with a plurality of k space segments using a preparation pulse. The technique included acquiring a first k-space dataset of the object using a first echo time and a first delay after the preparation pulse before the several spin-echoes are acquired. The technique further includes acquiring a second k space dataset of the object using a second echo time and a second delay after the preparation pulse, with at least one of the second echo time and the second delay time being different from the corresponding first echo time and the first delay time, generating a combined k space, and generating the MR image based on the combined k space dataset.

Abstract: In a method and apparatus for creating magnetic resonance data of at least two simultaneously manipulated, non-overlapping slices of an examination object by a parallel acquisition technique, reference data are acquired such that, between acquisition of slice scan data of a slice scan data set in which the scan data of all simultaneously manipulated slices are incorporated in an overlaid manner, and its associated reference data, no slice scan data of a different slice scan data set are acquired. A high level of robustness with respect to movements of the examination object is thereby achieved.

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.

Abstract: A magnetic resonance apparatus and method acquire magnetic resonance data with a recording technique in which the Cartesian scanning of k-space is carried out differently, by a rotation of gradient directions around the center of k-space, for different recording sections of a respective part of the magnetic resonance data, and this recording technique is combined with an accelerating imaging technique for which reference data completely describing a reference range around the center of k-space are used for each individual slice to be scanned. At the beginning of the recording, a calibration area of k-space, which includes all the reference ranges required in the course of recording, is determined and a calibration data set of k-space is recorded in a calibration measurement with complete, Cartesian scanning of the calibration area. Reference data for each recording section are determined from this calibration data set.

Abstract: In a magnetic resonance apparatus and a method for generating MR image data of a subject with parallel imaging, a reference data set of the object is recorded, in which at least one partial section of the associated raw data space is completely filled with raw data according to the Nyquist condition, and an imaging data set is recorded for the generation of the MR image data on the basis of spin-echo-based signals, in which the associated raw data space is not completely recorded according to the Nyquist condition. A weighting matrix is calculated based on the reference data set, which is used to determine raw data points of the imaging data set not recorded during parallel imaging. The unrecorded raw data points of the imaging data set are calculated using the calculated weighting matrix.

Abstract: A method and apparatus for controlling a magnetic resonance tomography system in context of a multi-echo imaging method, the method including exciting a multi-echo readout in the context of the multi-echo imaging method, and varying a phase encoding or slice encoding of temporally successive echoes of an echo train resulting from the multi-echo readout.

Abstract: Reference data is acquired by a slice multiplexing technique on the basis of which calibration data is determined and used to separate measurement data that has been acquired in collapsed form also by a slice multiplexing technique from at least two slices and still has to be separated into single-slice measurement data. As a result, both the reference data and the measurement data to be separated are acquired from several slices simultaneously in each case and hence during the same physiological state of motion in each case. This reduces the sensitivity to motion of a separation of the measurement data performed on the basis of the reference data.

Abstract: Monitoring a patient in a magnetic resonance system, wherein images of the patient are acquired by a camera in real time, a movement of the patient and a degree of this movement of the patient is determined by evaluating the images, and a symbol symbolizing a part of the patient is depicted, wherein a depicted property of the symbol depicts the degree of movement.

Abstract: In a method and magnetic resonance (MR) apparatus for creating an MR 3D image dataset, spin echo sequences are used to acquire two raw datasets that are each undersampled, wherein the excitation pulses or the refocusing pulses radiated in the data acquisitions have an opposite phase for the two raw datasets. These two raw datasets are combined into a combined 3D raw dataset that is not undersampled, and a weighting matrix is calculated for use in calculating the raw data points that were not acquired in the first raw dataset and the raw data points not acquired in the second raw dataset. A first complete raw dataset and second complete raw dataset are thereby calculated, which are then combined. The MR 3D data is then reconstructed from tis combined raw dataset.

Abstract: In a method and apparatus for acquiring magnetic resonance (MR) data from multiple slices of a subject, a spin echo sequence is executed wherein a radio frequency (RF) excitation pulse, a refocusing pulse, and a further RF pulse are radiated, together with the application of a number of gradients, in order to acquire MR data from an intersection volume of a selected slice with a further slice. The MR data are entered into at least one k-space line in a memory organized as k-space.

Abstract: In a magnetic resonance slice multiplexing method and apparatus, measurements are performed repeatedly subject to the assignment of additional phases to the respective slices, the additionally assigned phases being changed with reach repetition such that at least one central k-space region is sampled completely in each of the repeated acquisitions. A calibration dataset is determined from the measurement data acquired completely in the central k-space region. The calibration dataset is used when reconstructing image data for the simultaneously excited slices from the acquired measurement data.

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: Techniques are disclosed related to recording a magnetic resonance image data set of a region of a patient with a magnetic resonance device using a multislice imaging technique. The multislice technique may be applied simultaneously with at least partial undersampling in a slice plane. The magnetic resonance data may be read out from a set of excited slices simultaneously and, by means of a slice separation algorithm that is calibrated using reference data recorded in a separate reference scan, may be allocated to the simultaneously read-out slices. Subsequently, an undersampling algorithm compensating for the undersampling in the slice plane may be applied to the undersampled magnetic resonance data of the individual slices.

Abstract: A method and system for suppressing metal artifacts in magnetic resonance (MR) images of slices of a patient containing a metallic implant. The method and system can use a Slice Encoding for Metal Artifact Correction (SEMAC) sequence. In the method and system, MR data of each slice is fully sampled in k-space in a reference region located in a center of k-space in a phase-encoding direction and a central section in a slice-selection direction. The MR-data of each slice outside the reference region can be undersampled in k-space. The fully sampled MR data from the reference regions of each slice can be combined to generate a reference data set for reconstructing an MR image of each slice.

Abstract: A method is for providing an attenuation map of a patient, suitable for correcting PET data of the patient acquired with combined magnetic resonance/positron emission tomography imaging in a magnetic resonance/positron emission tomography system. In an embodiment, the method includes acquiring magnetic resonance data with at least one imaging scan in the magnetic resonance/positron emission tomography system; determining the attenuation map of the patient using the magnetic resonance data and providing the attenuation map of the patient for correcting the PET data of the patient acquired with combined magnetic resonance/positron emission tomography imaging.

Abstract: In a method and apparatus for acquiring magnetic resonance data from a slice package composed of multiple measured slices as a target volume by executing a measuring sequence, prior to each scan of one of the measured slices, the measuring sequence includes a preparation pulse associated with the measured slice for signal suppression of a type of saturation molecule. This said preparation pulse acts on the entire target volume, and a pulse parameter of the preparation pulse is chosen for a measured slice group, composed of at least one measured slice, as a function of resonance information on the contiguous partial volume covered by the measured slice group.

Abstract: In a magnetic resonance tomography (MRT) apparatus and operating method, a field of view for imaging a target object is acquired. A relative position of this field of view in relation to a receiving space of the MRT scanner, in which the target object is received, is then automatically determined. A radio-frequency (RF) pulse to be used by the MRT scanner for imaging the target object is then automatically adjusted depending on this relative position. An excitation angle produced in the field of view by the RF pulse is changed compared to the use of the corresponding unadjusted RF pulse.

Abstract: A method is for providing an attenuation map of a patient, suitable for correcting PET data of the patient acquired with combined magnetic resonance/positron emission tomography imaging in a magnetic resonance/positron emission tomography system. In an embodiment, the method includes acquiring magnetic resonance data with at least one imaging scan in the magnetic resonance/positron emission tomography system; determining the attenuation map of the patient using the magnetic resonance data and providing the attenuation map of the patient for correcting the PET data of the patient acquired with combined magnetic resonance/positron emission tomography imaging.

Abstract: Generating a magnetic resonance image dataset includes providing a raw dataset that has been acquired such that the raw dataset is spatially and/or temporally undersampled. A regularization parameter is determined in an automated manner, and an image dataset is generated from the raw dataset using the regularization parameter in a compressed sensing technique.