Siemens Healthcare Gmbh

Siemens Healthineers Ag

Centre National De La Recherche Scientifique

Institut National De La Sante Et De La Recherche Medicale

King's College London

Universite Paris Cité

Université Paris Xiii Paris-Nord Villetaneuse

Stephan Kannengießer

Rainer Schneider

Jürgen Nistler

Georg Seegerer

David Grodzki

Markus Vester

Stephan Biber

Stefan Popescu

Marcel Dominik Nickel

Radhouene Neji

Xiaodong Zhong

Martin Harder

Robert Rehner

Andre De Oliveira

Gudrun Ruyters

Ralph Sinkus

Omar Darwish

Wilfried Landschütz

A system includes two magnetic resonance tomography units. Each of the magnetic resonance tomography units includes a magnet unit having a magnetic controller for generating a homogenous magnetic field. The magnetic controller is configured to change the homogenous magnetic field in a short, predetermined time within image acquisition of an object under examination, such that a Larmor frequency for a predetermined layer of the object under examination remains in a predetermined frequency range. A first magnetic resonance tomography unit has a first predetermined frequency range, and a second magnetic resonance tomography unit has a second predetermined frequency range. The first predetermined frequency range and the second predetermined frequence range are disjoint.

System including magnetic resonance tomography units operated with limited bandwidth

A magnetic resonance tomography unit includes a magnet unit having a magnetic controller for generating a homogenous magnetic field. The magnetic controller is configured to change the homogenous magnetic field in a short, predetermined time within image acquisition of an object under examination, such that a Larmor frequency for a predetermined layer of the object under examination remains in a predetermined frequency range. A layer in the object under examination is selected and a value for the homogenous magnetic field, in which the Larmor frequencies of the nuclear spins of the layer lie in a predetermined frequency band, is determined by a control unit taking into account a predetermined magnetic field gradient. The established value for the homogenous magnetic field and the predetermined magnetic field gradient is set by the magnetic controller, and an excitation pulse, frequencies of which only lie in the predetermined frequency band, is emitted.

Magnetic resonance tomography unit and method for operating a magnetic resonance tomography unit with limited bandwidth

A magnetic resonance tomography (MRT) unit includes a field magnet, a transmitter, and a transmitting antenna. The MRT unit also has a transmission interference suppression facility with a transmission interference suppression controller, a plurality of sensors, and a transmission interference suppression antenna. The transmission interference suppression facility is configured to pick up, with the sensors, an excitation signal of the transmitter, determine, with the transmission interference suppression controller, a transmission interference suppression signal as a function of the excitation signal of the transmitter, and emit the signal via the transmission interference suppression antenna, so that at a predetermined location outside of the MRT unit, an electromagnetic alternating field of an excitation signal emitted by the transmitter via the transmitting antenna is attenuated. The sensors are arranged in a near field of the transmitting antenna, and the predetermined location of the attenuation is in a far field of the transmitting antenna.

MR system with partial shielding cabin and method for operation

In accordance with a method for operating an MRT system a first MR recording is performed so as to map an object to generate first MR data that represents the object. The first MR recording is performed in accordance with a first k-space scanning scheme and during the first MR recording at least one first excitation pulse is transmitted. A second MR recording that is different from the first MR recording is performed to generate second MR data and a noise component is determined in dependence upon the second MR data by a computing unit and the noise component represents an influence of at least one external noise source. An MR image is generated by the computing unit in dependence upon the first MR data and in dependence upon the noise component.

Magnetic resonance tomography having dual recording for noise reduction

A method and system for performing three-dimensional, 3D, magnetic resonance elastography, MRE, using a multi-slice gradient echo, GRE, imaging sequence. Four scans typically required to be performed during MRE, and during four breath-holds, are combined into a single measurement that can be performed during a single breath-hold.

Method and system for magnetic resonance elastography

Methods and systems are provided for identifying radio frequency (RF) interference without an RF room during imaging in a magnetic resonance tomography system. The method includes performing an acquisition, wherein scanning of a k-space along a trajectory takes place and an angle of rotation &#x3b1; exists between a scan start position of a first individual acquisition and a scan start position of a following second individual acquisition. A first image is obtained from the first individual acquisition and a second image is obtained from the second individual acquisition. One of the two images is rotated in respect of the other image about the angle of rotation &#x3b1;. A correlation is determined between the one rotated image and the other image, and a point of interference is identified from the correlation.

Identifying radio frequency interference in a magnetic resonance system

In a magnetic resonance (MR) apparatus and method to evaluate the consistency of a signal model used to generate a quantitative parameter map, the residual of the quantitative parameter map is calculated and a residual map is generated. The residual map is displayed together with the quantitative parameter map, with the residual map serving as an indicator of the quality of fit of the signal model.

Magnetic resonance method and apparatus to generate a residual map as an indicator of signal model consistency

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Wuppertal, Germany

Stephan Kannengießer