Siemens Aktiengesellschaft

Siemens Healthcare Gmbh

Siemens Healthineers Ag

Jürgen Nistler

Markus Vester

Ludwig Eberler

Wolfgang Renz

Razvan Lazar

Stephan Biber

Volker Matschl

Stefan Stocker

Rainer Schneider

Andre De Oliveira

Andreas Potthast

Norbert Rietsch

Christian Wünsch

Adam Paul Johnstone

Adrian Bampton

Dominik Paul

Gerhard Brinker

Wolfgang Bielmeier

Volker Model

Swen Campagna

Matthias Gebhardt

Nikolaus Demharter

Gudrun Ruyters

Carsten Prinz

Martin Schramm

Stephan Kannengießer

Bernd Erbe

Stephan Stöcker

Georg Martschenko

Günther Zebelein

Martin Rausch

Georg Seegerer

Oliver Heid

Thorsten Speckner

Dieter Ritter

Hubertus Fischer

Ralph Kimmlingen

Dirk Diehl

Helmut Lenz

Andreas Krug

David Andrew Porter

Sebastian Martius

Ludwig Kreischer

Axel Vom Endt

Ralf Kartäusch

Volker Schnetter

Uvo Hölscher

Eva Eberlein

Rainer Kurth

Michael Eberler

Marc Beckmann

Volker Weißenberger

Petra Bildhauer

Wilfried Landschütz

Carsten Großhauser

Michael Köhler

Sandra Weiβ

A magnetic resonance tomography system with a sensor for detecting spikes and with a gradient coil. Nuclear spins of an object under observation are excited by a magnetic alternating field of the magnetic resonance tomography system. A gradient field is generated by the magnetic resonance tomography system using the gradient coil. A magnetic resonance signal is acquired using a receiving antenna of the magnetic resonance tomography system and an interference signal using the sensor. From the magnetic resonance signal an image is reconstructed as a function of the acquired interference signal of the sensor.

Sensor for detecting gradient-bounded interference to a magnetic resonance tomography system and method for operation

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 method of operating a magnetic resonance imaging (MRI) apparatus includes exciting a body coil of the MRI apparatus to emit a radio-frequency signal, determining a center frequency of a resonance curve of the body coil, and calculating a magnet target frequency based on the determined center frequency. A magnet is ramped to the magnet target frequency.

Operating an MRI apparatus

A magnetic resonance tomography unit and a method for operating the magnetic resonance tomography unit are provided. The magnetic resonance tomography unit has a transmission interference suppression device with a transmission interference suppression control system, a sensor, and a transmission interference suppression antenna. The transmission interference suppression device is configured to acquire, with the sensor, an excitation signal of the transmitter, and determine, with the transmission interference suppression control system, a transmission interference suppression signal dependent upon the acquired excitation signal of the transmitter. The transmission interference suppression device is configured to transmit, via the transmission interference suppression antenna, the transmission interference suppression signal, so that at a predetermined location outside the magnetic resonance tomography unit, the excitation signal emitted by the transmitter via the transmitter antenna is attenuated.

Method and apparatus for suppressing interference emissions in magnetic resonance systems

A magnetic resonance tomography system that includes a transmitter for generating an excitation signal and a body coil for emitting the excitation signal, and a method for operation of the magnetic resonance tomography system are provided. The magnetic resonance tomography system has a patient tunnel, in which the body coil is arranged. The magnetic resonance tomography system also has a first transmission interference suppression antenna that is arranged between the body coil and an opening in the patient tunnel. The first transmission interference suppression antenna is configured to provide a spatial transmission characteristic that may be compared with the body coil.

Method and apparatus for interference suppression for MR whole body antennas

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

A magnetic resonance tomography system has an interference suppression transmitter and an interference suppression antenna. The interference suppression transmitter is configured to output an interference suppression signal via the interference suppression antenna as a function of a transmission interference suppression parameter determined from a patient property. In a predetermined region of an environment of the magnetic resonance tomography system, a field strength of the excitation pulse is reduced by destructive interference.

Device and method for patient-specific interference suppression

A system and method are provided for operating a magnetic resonance tomograph. A transmitter of the magnetic resonance tomograph transmits a predetermined test pulse with a reduced power. The magnetic resonance tomograph receives the test pulse with the local coil. A controller compares the received test pulse with a predetermined pulse response and emits a warning signal when the received test signal differs from the predetermined pulse response.

Method and device for monitoring local coils

A calibration method for calibrating a measuring element for determining an electric current flowing through a basic-field magnet of a magnetic resonance imaging system includes performing a measurement with the measuring element, and performing a frequency measurement in the magnetic field of the basic-field magnet with a frequency measuring unit. The measurement of the measuring element and the frequency measurement are corresponding to the same magnetic field of the basic-field magnet. The calibration method also includes calculating a calibration factor based on a deviation between the measurement with the measuring element and the frequency measurement, and calibrating the measuring element or the electric current in the basic-field magnet based on the calibration factor.

Method and device for controlling a magnetic resonance imaging system

A magnetic resonance coil having at least one tuning device for tuning the magnetic resonance coil, a magnetic resonance device, and a method for tuning a magnetic resonance coil are provided. The at least one tuning device includes a plurality of capacitors that are mechanically interlinked.

Tunable magnetic resonance coil

A magnetic resonance tomography unit and a method for operating the magnetic resonance tomography unit are provided. The magnetic resonance tomography unit includes a transmitter for generating excitation pulses with a wavelength lambda, an antenna for emitting the excitation pulses, a feed line, and a voltage sensor. The voltage sensor is arranged on the feed line at an effective distance corresponding to a multiple of half the wavelength lambda from a feed point on the antenna.

Apparatus and method for B1 limiting

The disclosure relates to a compensation capacitor for an antenna of a magnetic resonance scanner and a corresponding antenna with a compensation capacitor. The compensation capacitor has a first electrode and a second electrode arranged in parallel. An insulation material configured to resist high voltages and a dielectric with low dielectric losses are arranged between the first and the second electrode. The second electrode and/or the dielectric may be moved relative to the first electrode such that a surface area of a projection of the surface of the first electrode along the surface normal of the first electrode to the surface of the second electrode and/or the dielectric is variable.

Flat adjustable capacitor for magnetic resonance scanner

A transmitting antenna for a magnetic resonance device includes a plurality of antenna conductors arranged spaced from one another circumferentially around a center line and extending parallel to the center line, and a screening element extending parallel to the center line and circumferentially encompassing the antenna conductors. For at least one pair of the antenna conductors, a radial distance between a first antenna conductor of the pair and the screening element is smaller than a radial distance between a second antenna conductor of the pair and the screening element, a width of the first antenna conductor is smaller in the circumferential direction than a width of the second antenna conductor in the circumferential direction, axial ends of the first antenna conductor are coupled together via a higher capacitance capacitor than axial ends of the second antenna conductor.

Transmitting antenna for a magnetic resonance device

Growing community of inventors

Erlangen, Germany

Jürgen Nistler