Siemens Healthcare Gmbh

Siemens Healthineers Ag

The United States of America, as Represented by the Secretary, Department of Health and Human Services

Julius-Maximilians-Universitat Wurzburg

Manuel Stich

Mario Zeller

Dominik Paul

Nadine Dispenza

Herbert Köstler

Julian Richter

Tobias Wech

Thorsten Feiweier

Josef Pfeuffer

Andrew Dewdney

Gudrun Ruyters

Adam Kettinger

Philipp Höcht

Adrienne Campbell

Anne Slawig

Ralf Kartaeusch

Christiane Pfaff

Richard Dederichs

A magnetic resonance elastography apparatus, which may include a magnetic resonance apparatus and an elastography apparatus, is described. The magnetic resonance apparatus comprises a scanner unit, a patient receiving region surrounded at least partially by the scanner unit, and a patient couch, which is embodied to introduce a patient into the patient receiving region. The elastography apparatus comprises a drive unit, a vibration applicator which is arranged for an examination on the patient, and a force transmission unit, which is embodied to transmit a drive moment from the drive unit to the vibration applicator. The elastography apparatus comprises an EMC-tight shield housing with a cylindrical radiofrequency hollow conductor, and the drive unit is arranged within the radiofrequency hollow conductor.

Magnetic resonance elastography apparatus

Techniques are provided for performing three-dimensional diffusion weighted magnetic resonance imaging. A diffusion gradient is applied by controlling a gradient coil arrangement of an MRI system and, during an acquisition period after the application of the diffusion gradient, a readout gradient is applied by controlling the gradient coil arrangement and MR data is acquired. For applying the readout gradient, the gradient coil arrangement is controlled such that the MR data is acquired at least along a trajectory segment of a three-dimensional k-space trajectory, wherein a k-space center is sampled by the trajectory segment multiple times during the acquisition period.

Three-dimensional diffusion weighted magnetic resonance imaging

A plurality of reception coils are used to acquire magnetic resonance signals using parallel imaging and a k-space acquisition scheme, in which alternatingly the central region and one of the peripheral k-space portions are imaged in acquisition steps of a pair, such that after a partition number of such pairs, the whole k-space to be acquired has been imaged and a sliding reconstruction window can be applied to reconstruct an additional magnetic resonance image after each acquisition of such a pair. A time series of magnetic resonance images forming the magnetic resonance data set is then reconstructed from the magnetic resonance signals and sensitivity information regarding the plurality of reception coils by using the sliding reconstruction window and a reconstruction technique for undersampled magnetic resonance data. The k-space trajectories for each acquisition step are chosen to allow controlled aliasing in all three spatial dimensions including the readout direction.

Computer-implemented method for determining a dynamic contrast-enhanced magnetic resonance data set, magnetic resonance imaging device, computer program and electronically readable storage medium

Techniques for determining a functional magnetic resonance data set of an imaging region of a brain of a patient are disclosed in which blood oxygenation level dependent functional magnetic resonance imaging is used. The techniques include using a plurality of reception coils, and acquiring magnetic resonance signals using parallel imaging and a magnetic resonance sequence defining a k-space trajectory, wherein undersampling in at least two k-space directions is performed. The techniques further include reconstructing the functional magnetic resonance data set from the magnetic resonance signals and sensitivity information regarding the plurality of reception coils using a reconstruction technique for undersampled magnetic resonance data, wherein the k-space trajectory is chosen to allow controlled aliasing in all three spatial dimensions including the readout direction.

Techniques for determining a functional magnetic resonance data set

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.

Accelerated acquisition of scan data by means of magnetic resonance

A method for recording a magnetic resonance image dataset includes providing a magnetic resonance sequence with a series of sequence blocks, and providing at least one correction term to compensate for a magnetic field change. The magnetic field change is produced as a change of an actual magnetic field compared to a setpoint magnetic field by gradient pulses. The magnetic field change is established via a transfer characteristic of the gradient system of the magnetic resonance installation. The at least one correction term is used to compensate for the magnetic field change, and at least one magnetic resonance image dataset is recorded with the magnetic resonance sequence using the correction term.

Method for recording a magnetic resonance image dataset, data medium, computer program product, and magnetic resonance installation

A method for recording a magnetic resonance image data set includes providing a magnetic resonance sequence. The magnetic resonance sequence includes at least one radio-frequency pulse and a slice-selection gradient pulse applied during or before the radio-frequency pulse, which is configured as non-constant. The method includes providing at least one correction term for compensating a magnetic field change of the slice-selection gradient pulse. The magnetic field change is ascertained via a transfer characteristic of the gradient system of the magnetic resonance system. The method also includes recording at least one magnetic resonance image data set with the magnetic resonance sequence using the correction term.

Method for recording a magnetic resonance image data set, data carrier, computer-program product, and magnetic resonance system

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.

Continual trajectory correction in magnetic resonance imaging

In a method for MRI of an object, spins of a first material and spins of a second material are excited. An in-phase echo signal is acquired when the spins are in-phase and an out-of-phase echo signal is acquired, when the spins are out of phase. A first image for the first material and/or a second image for the second material is generated by a computing unit depending on the in-phase echo signal and the out-of-phase echo signal. For acquiring the out-of-phase echo signal, a momentum space is sampled asymmetrically in a read-out direction.

Method and system for in-phase and out-of-phase magnetic resonance imaging

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 (G(t)) is defined on the basis of the diffusion imaging pulse sequence. A time interval (t, t) 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 (G(t)), a time-dependent magnetic field deviation (&#x394;B(t)) in the determined time interval (t, t) 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 (&#x394;B(t)).

Correction of distorted diffusion-weighted magnetic resonance image data

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.

Method and system for accelerated wave data magnetic resonance acquisition

A gradient system characterization function (e.g., a gradient system transfer function) may be developed by measuring a behavior of the MR device at a target temperature and developing at least one gradient system characterization function for a gradient coil of a magnetic resonance (MR) device at the target temperature based on the measured behavior. A patient may be subsequently imaged by the MR device, wherein the imaging process comprises measuring a temperature of a gradient coil, determining a gradient system characterization function at the measured temperature, calculating a pre-emphasized gradient of the gradient coil, and imaging the patient using the pre-emphasized magnetic field component.

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Parkstein, Germany

Manuel Stich