Abstract: In a method for operating an MRI device, image data is acquired using a spin echo sequence with an additional readout per pulse train for acquiring correction data. By comparing subsequent correction data of later pulse trains to reference data acquired during a first pulse train of the sequence a difference indicating a parameter shift is determined. A corresponding compensation is then automatically determined in dependence on the difference and is applied to a set of predetermined parameters for at least a respective next pulse train and/or to the image data acquired in at least a respective next pulse train of the sequence.

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: In a method for generating an MR image of an object, k-space of the MR image is separated into blades. In each blade, parallel k-space lines are provided which are separated in a phase encoding direction (PED). Each blade has a different rotation angle around a common center relative to the remaining blades. A spatial extent of the object is determined. For the blades, the extent of the object in the corresponding PED is determined. A blade specific extent of a field of view (FOV) in the PED is determined for each of the blades based on the corresponding extent of the object in the PED. The extent of the FOV in the PED differs for at least one of the blades from the extent of the remaining blades, and sampling the k-space with the blades with the determined blade specific FOV as determined for each of the blades.

Abstract: In a method for generating synthetic medical image data, first image data of an object under examination including a first value for a property is acquired, second image data of the object under examination including a second value for the property is acquired, the second value of the property of the second image data is matched to the first value to modify the second image data to generate synthetic image data, and the synthetic image data is provided (e.g. in electronic form as a data file). The first image data can be captured with a first magnetic resonance device at a first point in time, and the second image data can be captured with a second magnetic resonance device at a second point in time.

Abstract: A method for operating a magnetic resonance device includes using an acquisition technique using a plurality of coil elements of a transmit and/or receive coil in parallel. For each coil element, a sensitivity map describing the spatial sensitivity of the respective coil element is acquired at the start of the acquisition procedure and used in the reconstruction of a magnetic resonance image dataset from the magnetic resonance data. Magnetic resonance data of the individual coil elements is thus merged. Reference information indicating the position of the patient and/or of the coil elements is measured at the start of the examination procedure. Comparison information supplementary thereto is measured during the acquisition procedure. A reacquisition of at least a portion of the sensitivity maps is performed if at least one recalibration criterion describing a deviation exceeding a threshold value is fulfilled in a comparison of the comparison data with the reference data.

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 for performing a magnetic resonance measurement of an organ structure of a patient using a magnetic resonance imaging system adapted to the imaging of the organ structure: a correct positioning of the organ structure of the patient is ascertained, a correct positioning of the magnetic resonance imaging system with regard to the positioning of the organ structure of the patient is ascertained, a magnetic resonance scanning protocol is selected, a spatial coverage of the magnetic resonance measurement with regard to the organ structure to be imaged is adjusted, and the magnetic resonance measurement is performed to acquire magnetic resonance image data of the organ structure.

Abstract: In a system and method for performing MR image reconstruction based on acquired MR measurement data of an organ structure of a patient, the MR measurement data of the organ structure is received, a-priori information about the organ structure from which the MR measurement data have been acquired is received, MR image reconstruction is performed based on the MR measurement data and taking into account the a-priori information, and the reconstructed MR image data is provided.

Abstract: In a method and system for reducing motion artifacts in magnetic resonance image data acquired from a facial region of a patient, the patient is positioned in an imaging region of a magnetic resonance imaging device configured to perform a magnetic resonance measurement of the facial region of the patient, the magnetic resonance measurement is performed to acquire magnetic resonance image data of the facial region of the patient, and a motion correction technique is employed exploiting an accessibility to the facial region of the patient during the magnetic resonance measurement. The motion correction technique advantageously reduces an influence of a patient motion on the magnetic resonance image data.

Abstract: A method for compiling a dental overview map of the dentition of an examination object on the basis of magnetic resonance (MR) data from a MR measurement of the dentition. An MR measurement for acquiring MR data if performed from the dentition. An analysis of sections of the dentition is performed in order to determine an abnormality on the basis of the MR data, wherein a section of the dentition includes a subset of the number of teeth in the dentition, and an abnormality is determined in at least one section. A dental overview map is compiled as a function of the MR data and the abnormality of the at least one section of the dentition. The dental overview map is provided. Also, an MR apparatus with a computer, and a computer program product directly loadable into a data storage device of a computer of an MR apparatus in order to carry out the method.

Abstract: In a method and apparatus for recording a magnetic resonance dataset with a number of reception coils, wherein the measurement signals of the magnetic resonance dataset contain measurement signals from at least two slices, the measurement signals are recorded segmented by the measurement signals being recorded in a first area of k-space with a first scanning density and in a second area of k-space with a second scanning density.

Abstract: The disclosure relates to the automatic determination of correction factor values for producing MR images using a magnetic resonance system. A plurality of MR images is produced, wherein each MR image is produced using parameters with parameter values and using correction factors with correction factor values. In order to produce the MR images, MR data of the same examination object is acquired under the same external boundary conditions. The MR images are evaluated automatically in respect of artifacts in the respective MR image, in order to determine the MR image with the least artifacts among the MR images. The correction factor values are determined as those correction factor values which have been used to produce the MR image with the least artifacts. The parameters determine a sequence, with which the MR data is acquired for producing the MR images. The correction factors reduce influences which influence the acquisition of the MR data.

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: In a method and magnetic resonance apparatus for generating at least one combination image dataset, a first image dataset is acquired with a turbo spin echo sequence, wherein the echo signals are timed so that the spins of two spin species in the region to be examined are in-phase. A second image dataset is acquired with a turbo spin echo sequence, wherein the echo signals are timed so that the spins of two spin species in the region to be examined have opposed phase. The first image dataset and the second image dataset are combined to form a combination image.

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: In a method for improved recording of scan data of an examination object by means of a magnetic resonance system with the aid of a simultaneous multi-slice (SMS) method, a minimum repetition time TR is determined dependent upon a quality criterion. The quality criterion herein extends the scan time, which is actually greatly shortened by the use of an SMS method, for the MR signals of the slice stack to be recorded, to the minimum repetition time TR. The “time reserve” thereby obtained (the difference of the determined minimum repetition time TR from the scan time needed for the slice stack to be recorded purely by means of the SMS method) is utilized to take account of further slices in the recording of the MR signals. By this means, firstly, further information can be obtained and, secondly, the image quality of the image data obtained is improved.

Abstract: Accelerated acquisition of scan data by means of magnetic resonance to enable short echo times so that scan data of substances can also be acquired with a transversal relaxation time.

Abstract: Techniques are disclosed for an improved acquisition of measurement data of an object under examination by means of a magnetic resonance system using a simultaneous multi-slice (SMS) method in which magnetic resonance signals are acquired in at least two slice groups from different slices of the object under examination. The slices contained in a slice group are detected simultaneously in an acquisition of MR signals, which includes the generation of one multiband RF pulse for each slice group. A multiband RF pulse is used to simultaneously manipulate spins of the slices contained in each respective slice group such that the signal intensity profiles of the multiband RF pulses differ from one another. By virtue of the multiband RF pulses being generated according to these techniques, step changes in the signal intensity of the produced image data can be prevented.

Abstract: Techniques are disclosed for creating measurement data of an examination object by means of magnetic resonance technology in a plurality of repetitions according to a pulse sequence pattern, existing information about gradients that have already been switched is considered to determine compensation gradients that are possibly to be switched in a following repetition for compensating eddy current effects. Such dynamic determination and switching of compensation gradients make it possible to dynamically compensate eddy currents. Consequently, the image quality of image data reconstructed from measurement data acquired using inventive compensation gradients is increased.

Abstract: In a method and magnetic resonance (MR) apparatus for acquisition of MR data from a patient in a breath-hold examination an instruction is provided to the patient to hold his/her breath, and the acquisition of MR measurement data is started. A breathing curve is recorded at least after the output of the instruction to the patient. A next-breath time is determined based on the recorded breathing curve. At least one final MR measurement data set is created based on the acquired MR measurement data, depending on the detected next-breath time. Image data are reconstructed from the at least one final MR measurement data set.