Siemens Aktiengesellschaft

Siemens Healthcare Gmbh

Siemens Medical Solutions Usa, Inc.

Siemens Healthineers Ag

Siemens Aktiengesellschsft

Klaus Huber

Markus Vester

Stephan Biber

Franz Eiermann

Ralph Oppelt

Claus Seisenberger

Andreas Fackelmeier

Thomas Bosselmann

Michael Willsch

Sebastian Martius

Robert Rehner

Christian Wünsch

Stefan Pott

Thorsten Speckner

Matthias J Schmand

Nikolaus Demharter

Helmut Greim

Nan Zhang

Stephan Zink

Johannes Reinschke

Jörg Zapf

Florian Poprawa

Andre Albsmeier

Clemens Jungkunz

Georg Rauh

Dominikus Joachim Müller

Daniel Evers

Martin Nisznansky

Francisco Javier Sevilla Perez

Christina Schindler

Andreas Schicht

Markus Both

Johanna Dorothee Schöpfer

Chih-Chung Chen

A local coil for a magnetic resonance tomography system is provided. The local coil has a plate-shaped local coil body with a main extension plane, and an electronic apparatus within the local coil body. A wireless local coil generates waste heat. Therefore, the local coil has an electrically non-conducting heat sink body that is connected for the conduction of heat to the electronic apparatus, and is configured as a type of plate within the local coil body in order to distribute heat of the electronic apparatus in the main extension plane of the local coil body. This provides that a surface of the local coil has a standards-compliant temperature.

Local coil for a magnetic resonance tomography system and a magnetic resonance tomography system

A single-stage radio frequency amplifier is provided with a signal amplification stage for a magnetic resonance tomography scanner, for example as a low-noise preamplifier in a local coil. The radio frequency amplifier includes a signal input, a signal amplifier, a signal output of the signal amplifier and a phase shifter. The phase shifter is in signal connection with the signal output and the signal input of the signal amplifier and is configured to couple a predetermined portion of an output signal of the signal amplifier with a predetermined phase shift into the signal input of the signal amplifier.

Single-stage amplifier with active feedback compensation

An apparatus checks for a presence of an electrically conductive body in the near field of charging coils of an arrangement for induced charging. At least one transmitting device provides a transmission signal in the form of a magnetic field. At least one receiving device generates a reception signal from the transmission signal and induced into the receiving device. The transmitting device and the receiving device are formed in such a way that, when the electrically conductive body is present, a first reception signal forms and, when the electrically conductive body is absent, a second reception signal, different than the first, forms in the receiving device on account of the induced transmission signal. The transmitting device and the receiving device are formed in a manner dependent on the magnetic field of the charging coils in such a way that, when the electrically conductive body is absent, partial reception signals form in the receiving device on account of the induced transmission signal, where partial reception signals substantially cancel one another out in the reception signal.

Checking a presence of an electrically conductive body

A magnetic resonance device includes a radiofrequency unit that includes a radiofrequency antenna, at least one radiofrequency line and at least one radiofrequency injection point. Radiofrequency signals are transferred to the radiofrequency antenna by the at least one radiofrequency line and are coupled into the radiofrequency antenna at the at least one radiofrequency injection point. The magnetic resonance device also includes a patient receiving zone that is at least partially enclosed by the radiofrequency antenna, and a motion detection unit for detecting a movement of a patient that may be positioned within the patient receiving zone. At least one radiofrequency line includes at least one injection element by which at least one motion detection signal of the motion detection unit is coupled into the radiofrequency line.

Magnetic resonance device having a motion detection unit and a method for detecting a movement of a patient during a magnetic resonance examination

The transmission antenna apparatus is configured for emitting transmission magnetic fields in magnetic resonance imaging devices and includes one or more flat antennas. A magnetic resonance imaging device includes such a transmission antenna apparatus.

Transmission antenna apparatus and magnetic resonance imaging device

A phase actuator for a continuously adjustable phase displacement at a first frequency is provided. The phase actuator has a first inductance with tapping point, a first continuously variable capacitor, and a transformation network. A signal input and a signal output of the phase shifter are connected by the first inductance. The first continuously adjustable capacitor is connected in parallel to the first inductance. The tapping point is connected via a transformation network to a reference mass, where an impedance value of the transformation network corresponds to a quarter wave transform of a capacitance value of the first continuously variable capacitance at the first frequency.

Continuously digitally adjustable phase actuator

An arrangement for detuning a receive antenna, a detunable magnetic resonance coil, and a magnetic resonance device having a detunable magnetic resonance coil are provided. The arrangement includes a receive antenna having at least one first capacitance, wherein radiofrequency signals from a magnetic resonance examination may be received by way of the receive antenna. The arrangement furthermore includes a switchable detuning circuit containing the first capacitance switched to form an oscillating circuit and a first inductance, and a switching device having a first and a second connection point to deliver a voltage between the first and a second connection point, and one or more transistors. The switching device switches the oscillating circuit to a high impedance level with aid of the one or more transistors on delivery of a positive voltage to the first connection point, preventing a radiofrequency signal from being received by way of the receive antenna.

Detuning a MRT receive antenna

A method for emitting a sequence of high frequency pulses that may have different envelopes in a magnetic resonance tomography system is provided. A digital instruction signal that specifies the envelope for the high frequency pulses that are to be emitted is received. A digital control signal is transmitted to a high frequency unit for generating high frequency pulses, depending on the instruction signal. A test signal that allows notification of a current overload situation is received. The current control signal is reduced if the test signal indicates an overload situation.

Emission of high frequency pulses in a magnetic resonance tomography system

Methods and a device for automatic detuning of a magnetic resonance tomography (MRT) local coil not connected to an MRT system are provided. The device has self-closing switches that are closed or open, depending on the presence of an MRT high-frequency field.

Automatic detuning of non-connected transceiver coils for MRI

An apparatus for checking for a presence of an electrically conductive body has at least one transmitting device and at least one receiving device. The transmitting device provides a transmission signal in the form of a magnetic field. The receiving device generates a reception signal from the transmission signal that is induced into the receiving device. The transmitting and receiving devices are configured in such a way that, when the electrically conductive body is absent, partial reception signals form in the receiving device on account of the induced transmission signal and the partial reception signals substantially cancel one another out in the reception signal.

Apparatus for checking for a presence of an electrically conductive body, and charging system

A method for controlling a signal with a plurality of independent components is provided. The signal is fed as an input signal via an input path to a control path that supplies an output signal. The output signal is fed via an output path to a control apparatus controlling the input signal. A coupling signal is determined in a coupling determination apparatus. On the basis of the coupling signal, the independent components are decoupled in a decoupling apparatus, as a result of which, a decoupled output signal is generated. Components of the decoupled output signal are decoupled from the components of the input signal. The decoupled output signal is fed as a control variable to the control apparatus. The control apparatus controls each independent component separately on the basis of a desired signal with a diagonal controller and outputs the input signal as a manipulated variable.

Method and device for controlling a signal with a plurality of independent components

A local coil system for detecting magnetic resonance (MR) signals in a magnetic resonance tomography (MRT) device includes an energy reception antenna for inductively receiving energy for the local coil system from a magnetic field changing over time with an energy transmission frequency. The energy reception antenna includes a conductor loop running in loop-like fashion from a first loop connection to a second loop connection. At least one path filter that blocks for harmonic frequencies of the energy transmission frequency is arranged over the course of the energy reception path, and/or at least one path filter that blocks for harmonic frequencies of the energy transmission frequency is arranged over the course of an energy reception path leading from the loop connections to a rectifier.

Local coil system including an energy reception antenna for inductively receiving energy for the local coil system

A two-channel magnetic resonance tomography system is provided with a regulation circuit for an amplification system in order to be able to take into account different load situations of the MRI system in a flexible and efficient manner. It is thus possible to improve the MRI measurements greatly if the MRI system is set to the respective load situation beforehand by an idle state measurement. The adaptation may optionally also be carried out during the MRI measurement. Therefore, a multiplicity of completely different load situations may be taken into account in an optimized manner by the regulation circuit.

Two-channel magnetic resonance imaging

A nuclear imaging system includes a detector configured to detect at least one photon event. A timing signal path is electrically coupled to the detector. The timing signal path is configured to generate a timing signal indicative of a timing of the at least one photon event. An energy signal path is also electrically coupled to the detector. The energy signal path is configured to generate an energy signal indicative of an energy of the at least one photon event. A time-domain multiplexer is configured combine the timing signal and the energy signal into a compound signal.

Transmission of PET-signals by means of time division multiplexing

A magnetic resonance apparatus includes receive coils and a receiver device for processing magnetic resonance signals received by coil elements of the receive coils. The receive coils are subdivided into at least a first group having at least one receive coil and a second group having at least one receive coil. The receive coils of the first group are connected to the receiver device via a hardwired communications link, and the receive coils of the second group are each connectable or connected to the receiver device via a wireless communications link.

Growing community of inventors

Effeltrich, Germany

Klaus Huber