Patents by Inventor Christian Wuensch
Christian Wuensch has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11226384Abstract: 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.Type: GrantFiled: December 10, 2019Date of Patent: January 18, 2022Assignee: Siemens Healthcare GmbHInventors: Jürgen Nistler, Volker Matschl, Stephan Biber, Rainer Kurth, Christian Wünsch, Georg Martschenko
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Patent number: 11073582Abstract: 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.Type: GrantFiled: December 13, 2019Date of Patent: July 27, 2021Assignee: Siemens Healthcare GmbHInventors: Georg Martschenko, Jürgen Nistler, Markus Vester, Christian Wünsch
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Patent number: 10830852Abstract: A radio-frequency control system for a magnetic resonance tomography system and a method for the operation thereof are provided. The radio-frequency control system includes a controller and a radio-frequency power amplifier with amplification between a signal input and a signal output of the radio-frequency power amplifier that is dependent on a predetermined frequency response. The controller determines a control pulse for multislice excitation and outputs the pulse to the signal input of the radio-frequency power amplifier. The controller determines a high-frequency power value for the control pulse in dependence on the predetermined frequency response of the radio-frequency power amplifier.Type: GrantFiled: November 29, 2018Date of Patent: November 10, 2020Assignee: Siemens Healthcare GmbHInventors: Uvo Hölscher, Stephan Stöcker, Christian Wünsch
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Publication number: 20200191888Abstract: 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.Type: ApplicationFiled: December 13, 2019Publication date: June 18, 2020Inventors: Georg Martschenko, Jürgen Nistler, Markus Vester, Christian Wünsch
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Publication number: 20200191890Abstract: 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.Type: ApplicationFiled: December 10, 2019Publication date: June 18, 2020Inventors: Jürgen Nistler, Volker Matschl, Stephan Biber, Rainer Kurth, Christian Wünsch, Georg Martschenko
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Patent number: 10345401Abstract: An apparatus and a method for detecting an antenna coil with a non-active detuning apparatus are provided. The apparatus has a transmitter, an antenna, an amplitude meter, and a controller. The controller actuates the transmitter such that the transmitter emits radio-frequency signals with different predetermined amplitudes via the antenna. The controller acquires testing amplitudes with the amplitude meter as a function of the emitted signal and determines a testing relationship between the predetermined amplitudes and the acquired testing amplitudes. If the determined testing relationship deviates from a predetermined reference relationship, a signal is output.Type: GrantFiled: May 11, 2018Date of Patent: July 9, 2019Assignee: SIEMENS HEALTHCARE GMBHInventors: Jürgen Nistler, Markus Vester, Christian Wünsch
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Publication number: 20190162804Abstract: A radio-frequency control system for a magnetic resonance tomography system and a method for the operation thereof are provided. The radio-frequency control system includes a controller and a radio-frequency power amplifier with amplification between a signal input and a signal output of the radio-frequency power amplifier that is dependent on a predetermined frequency response. The controller determines a control pulse for multislice excitation and outputs the pulse to the signal input of the radio-frequency power amplifier. The controller determines a high-frequency power value for the control pulse in dependence on the predetermined frequency response of the radio-frequency power amplifier.Type: ApplicationFiled: November 29, 2018Publication date: May 30, 2019Inventors: Uvo Hölscher, Stephan Stöcker, Christian Wünsch
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Patent number: 10145918Abstract: 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.Type: GrantFiled: March 4, 2013Date of Patent: December 4, 2018Assignee: Siemens AktiengesellschaftInventors: Nikolaus Demharter, Klaus Huber, Claus Seisenberger, Thorsten Speckner, Markus Vester, Christian Wünsch
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Publication number: 20180329003Abstract: An apparatus and a method for detecting an antenna coil with a non-active detuning apparatus are provided. The apparatus has a transmitter, an antenna, an amplitude meter, and a controller. The controller actuates the transmitter such that the transmitter emits radio-frequency signals with different predetermined amplitudes via the antenna. The controller acquires testing amplitudes with the amplitude meter as a function of the emitted signal and determines a testing relationship between the predetermined amplitudes and the acquired testing amplitudes. If the determined testing relationship deviates from a predetermined reference relationship, a signal is output.Type: ApplicationFiled: May 11, 2018Publication date: November 15, 2018Inventors: Jürgen Nistler, Markus Vester, Christian Wünsch
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Patent number: 9989617Abstract: A B1 magnetic field may be regulated during a magnetic resonance tomography (MRT) imaging sequence.Type: GrantFiled: February 28, 2013Date of Patent: June 5, 2018Assignee: Siemens AktiengesellschaftInventors: Jürgen Nistler, David Andrew Porter, Thorsten Speckner, Christian Wünsch
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Patent number: 9784811Abstract: 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.Type: GrantFiled: September 12, 2012Date of Patent: October 10, 2017Assignee: Siemens AktiengesellschaftInventors: Chih-Chung Chen, Klaus Huber, Johannes Reinschke, Claus Seisenberger, Markus Vester, Christian Wünsch
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Patent number: 9100111Abstract: A method for monitoring a high-frequency transmit device of a magnetic resonance tomography system with a transmit antenna system having a plurality of transmit channels is provided. A reference transmit signal is output on different transmit channels of the transmit antenna system, respectively, at different time points, and a reference measurement signal induced by the reference transmit signal is measured on at least one of the other transmit channels using a measuring device assigned to the transmit channel. Based on the reference measurement signal, a phase deviation indicator value is determined. The phase deviation indicator value indicates a relative phase deviation between the measuring devices of the transmit channels in question.Type: GrantFiled: October 18, 2013Date of Patent: August 4, 2015Assignee: Siemens AktiengesellschaftInventors: Olaf Behrendt, Pascal Mühlich, Volker Schnetter, Christian Wünsch
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Publication number: 20150028870Abstract: 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.Type: ApplicationFiled: September 12, 2012Publication date: January 29, 2015Inventors: Chih-Chung Chen, Klaus Huber, Johannes Reinschke, Claus Seisenberger, Markus Vester, Christian Wünsch
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Publication number: 20140113577Abstract: A method for monitoring a high-frequency transmit device of a magnetic resonance tomography system with a transmit antenna system having a plurality of transmit channels is provided. A reference transmit signal is output on different transmit channels of the transmit antenna system, respectively, at different time points, and a reference measurement signal induced by the reference transmit signal is measured on at least one of the other transmit channels using a measuring device assigned to the transmit channel. Based on the reference measurement signal, a phase deviation indicator value is determined. The phase deviation indicator value indicates a relative phase deviation between the measuring devices of the transmit channels in question.Type: ApplicationFiled: October 18, 2013Publication date: April 24, 2014Inventors: Olaf Behrendt, Pascal Mühlich, Volker Schnetter, Christian Wünsch
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Publication number: 20130229180Abstract: 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.Type: ApplicationFiled: March 4, 2013Publication date: September 5, 2013Inventors: Nikolaus Demharter, Klaus Huber, Claus Seisenberger, Thorsten Speckner, Markus Vester, Christian Wünsch
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Publication number: 20130221965Abstract: A B1 magnetic field may be regulated during a magnetic resonance tomography (MRT) imaging sequence.Type: ApplicationFiled: February 28, 2013Publication date: August 29, 2013Inventors: Jürgen Nistler, David Andrew Porter, Thorsten Speckner, Christian Wünsch
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Patent number: 8457103Abstract: A method synchronizes plural terminal communication systems and a counterpart communication station connected via a radio link within a multi-standard wireless communication system, wherein a counterpart transmission signal is transmitted from said counterpart communication station to the corresponding terminal communication system. A common reference clock signal is generated and supplied to a signal generation unit within said terminal communication system, wherein each terminal communication system comprises a conversion ratio unit having a conversion ratio. An accurate frequency datum is derived from each counterpart transmission signal in the terminal communication systems and a frequency control signal is determined from said accurate frequency datum.Type: GrantFiled: November 9, 2009Date of Patent: June 4, 2013Assignee: ST Ericsson SAInventors: Markus Neumann, Christian Wuensch
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Publication number: 20100113014Abstract: A method synchronizes plural terminal communication systems and a counterpart communication station connected via a radio link within a multi-standard wireless communication system, wherein a counterpart transmission signal is transmitted from said counterpart communication station to the corresponding terminal communication system. A common reference clock signal is generated and supplied to a signal generation unit within said terminal communication system, wherein each terminal communication system comprises a conversion ratio unit having a conversion ratio. An accurate frequency datum is derived from each counterpart transmission signal in the terminal communication systems and a frequency control signal is determined from said accurate frequency datum.Type: ApplicationFiled: November 9, 2009Publication date: May 6, 2010Applicant: ST ERICSSON SAInventors: Markus Neumann, Christian Wuensch
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Patent number: 6223022Abstract: A mobile radio telephone includes a transmitter output stage and an antenna. An impedance matching network is inserted between the transmitter output stage and the antenna. The matching network has a transformation factor (T) for adjusting the transmitter load impedance (ZPA) to match with the antenna input impedance (ZAAnt). The impedance matching network includes at least two impedance transformers that form at least two transformation factors by alternatively connecting in parallel the two impedance transformers.Type: GrantFiled: December 21, 1998Date of Patent: April 24, 2001Assignee: U.S. Philips CorporationInventors: Winfrid Birth, Ralf Burdenski, Christian Wünsch