Patents by Inventor Razvan Lazar
Razvan Lazar 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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Publication number: 20230280425Abstract: 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.Type: ApplicationFiled: February 16, 2023Publication date: September 7, 2023Inventors: Rainer Schneider, Jürgen Nistler, Razvan Lazar, Stephan Biber
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Patent number: 11131730Abstract: 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.Type: GrantFiled: September 13, 2018Date of Patent: September 28, 2021Assignee: Siemens Healthcare GmbHInventors: Ludwig Eberler, Razvan Lazar, Volker Matschl, Jürgen Nistler, Martin Schramm
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Patent number: 10930428Abstract: 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.Type: GrantFiled: July 5, 2018Date of Patent: February 23, 2021Assignee: Siemens Healthcare GmbHInventors: Ludwig Eberler, Razvan Lazar, Volker Matschl, Jürgen Nistler, Martin Schramm
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Patent number: 10761160Abstract: A method for adjusting a field distribution of an antenna arrangement of a magnetic resonance system is provided. The symmetry of the field distribution may be impaired by positional inaccuracy of the antenna arrangement in the magnetic resonance system. The antenna arrangement comprises oscillating circuit antenna elements and switching elements. Each of the oscillating circuit antenna elements is assigned a respective switching element of the switching elements. A respective switching element is configured to couple the assigned oscillating circuit antenna element operatively to the antenna arrangement in dependence on a status of the respective switching element. During the method, symmetry information on the field distribution in the antenna arrangement is measured, and the switching elements are automatically adjusted using the measured symmetry information, such that the symmetry of the field distribution in the interior of the antenna arrangement is increased.Type: GrantFiled: February 20, 2019Date of Patent: September 1, 2020Assignee: Siemens Healthcare GmbHInventors: Jürgen Nistler, Razvan Lazar
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Publication number: 20190257899Abstract: A method for adjusting a field distribution of an antenna arrangement of a magnetic resonance system is provided. The symmetry of the field distribution may be impaired by positional inaccuracy of the antenna arrangement in the magnetic resonance system. The antenna arrangement comprises oscillating circuit antenna elements and switching elements. Each of the oscillating circuit antenna elements is assigned a respective switching element of the switching elements. A respective switching element is configured to couple the assigned oscillating circuit antenna element operatively to the antenna arrangement in dependence on a status of the respective switching element. During the method, symmetry information on the field distribution in the antenna arrangement is measured, and the switching elements are automatically adjusted using the measured symmetry information, such that the symmetry of the field distribution in the interior of the antenna arrangement is increased.Type: ApplicationFiled: February 20, 2019Publication date: August 22, 2019Inventors: Jürgen Nistler, Razvan Lazar
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Patent number: 10295622Abstract: A method for signaling a tuning of an adjustment parameter of an antenna coil arrangement of a magnetic resonance tomograph includes detecting a deviation between an actual adjustment value of at least one adjustment parameter and a required adjustment value of the at least one adjustment parameter. As a function of the deviation, an acoustic and/or a mechanical signal is output in real time to an operator. A device for signaling a tuning of an adjustment parameter of a coil arrangement of a magnetic resonance tomograph, and a magnetic resonance tomograph operating according to the method and/or containing the device are described.Type: GrantFiled: March 6, 2015Date of Patent: May 21, 2019Assignee: Siemens AktiengesellschaftInventors: Razvan Lazar, Paul Yoe
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Publication number: 20190079153Abstract: 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.Type: ApplicationFiled: September 13, 2018Publication date: March 14, 2019Inventors: Ludwig Eberler, Razvan Lazar, Volker Matschl, Jürgen Nistler, Martin Schramm
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Publication number: 20190019620Abstract: 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.Type: ApplicationFiled: July 5, 2018Publication date: January 17, 2019Inventors: Ludwig Eberler, Razvan Lazar, Volker Matschl, Jürgen Nistler, Martin Schramm
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Patent number: 10162034Abstract: The embodiments relate to a magnetic resonance scanner including an antenna system having an adjustment device for modifying the natural frequency of a natural mechanical oscillation mode of the antenna system. According to the embodiments, in a method for operating a magnetic resonance imaging system having a magnetic resonance scanner comprising an antenna system, a natural frequency of a natural mechanical oscillation mode of the antenna system is controlled and/or regulated.Type: GrantFiled: April 11, 2014Date of Patent: December 25, 2018Assignee: Siemens AktiengesellschaftInventors: Razvan Lazar, Martin Schramm
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Patent number: 10107881Abstract: A device for thermal stabilization of a first electrical characteristic of an antenna array of a magnetic resonance tomograph includes a heat exchanger configured for thermal coupling of a component of the device to a heat source. The device also includes a temperature-dependent second electrical characteristic. In a predefined connection to the antenna array, the temperature-dependent second electrical characteristic is configured to compensate for an effect of a temperature-dependent change on the first electrical characteristic of the antenna array in a predetermined temperature range.Type: GrantFiled: August 11, 2014Date of Patent: October 23, 2018Assignee: Siemens AktiengesellschaftInventor: Razvan Lazar
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Patent number: 9784803Abstract: A magnetic resonance scanner includes an antenna system, such as a body coil, mechanically coupled to a support structure, such as a gradient coil, via a suspension system. The suspension system has a setting mechanism in order to reversibly set a coupling parameter value of the mechanical coupling between the antenna system and the support structure and/or a position or location of the antenna system relative to the support structure. The coupling parameter may be set during operation of a magnetic resonance imaging system including the magnetic resonance scanner.Type: GrantFiled: April 11, 2014Date of Patent: October 10, 2017Assignee: Siemens AktiengesellschaftInventors: Razvan Lazar, Martin Schramm
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Patent number: 9759788Abstract: The embodiments relate to a magnetic resonance coil for a magnetic resonance device with a measuring chamber for an examination object and a cylindrical birdcage antenna arrangement having a plurality of antenna elements disposed at least in some areas around a measuring chamber in the form of circumferential antenna rings or axial outer rods connecting the rings. The antenna elements include electric components, e.g., reactive capacitive and/or inductive systems. The magnetic resonance coil also has at least two antenna feeds, e.g., phase-offset in relation to one another by 90°, by which radio-frequency energy is able to be supplied to the birdcage antenna arrangement. The antenna feeds include at least one symmetrical feed via at least one of the electric components of the birdcage antenna arrangement as well is at least one assigned asymmetrical feed between the birdcage antenna arrangement and a screen connection.Type: GrantFiled: August 22, 2014Date of Patent: September 12, 2017Assignee: Siemens AktiengesellschaftInventors: Ludwig Eberler, Razvan Lazar, Jürgen Nistler
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Patent number: 9684043Abstract: A mounting device for a body coil of a magnetic resonance device is provided. The mounting device includes a suspension device that has at least one suspension element. The at least one suspension element is mechanically connectable to a counterpart piece of the body coil. The suspension device is configured for suspension and coarse adjustment of the body coil in the magnetic resonance device during an adjustment process of the body coil. The mounting device also includes an adjustment device that has an adjuster for changing a position of the body coil, and adjustment indicators for displaying the position of the body coil. The adjustment device is provided for fine adjustment of the body coil during the adjustment process. The mounting device includes an attachment device differing from the suspension device. The attachment device includes at least one attachment element for mechanical interaction with the body coil.Type: GrantFiled: June 26, 2014Date of Patent: June 20, 2017Assignee: Siemens AktiengesellschaftInventors: Razvan Lazar, Martin Schramm
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Patent number: 9599684Abstract: Mounting for a body coil of a magnetic resonance device is provided. A reversible and universal mounting device for a body coil in the magnetic resonance device is provided. The mounting device includes at least one expanding ring for creating a way of retaining the body coil in a tunnel-shaped magnetic opening of the magnetic resonance device. The mounting device also includes at least one expander that is configured to enable the expanding ring to be mounted on the inside of the tunnel-shaped magnetic opening of the magnetic resonance device by spreading. The mounting device includes at least one mounting element for mechanically supporting the body coil on the expanding ring.Type: GrantFiled: March 10, 2014Date of Patent: March 21, 2017Assignee: Siemens AktiengesellschaftInventors: Razvan Lazar, Martin Schramm
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Patent number: 9316708Abstract: A patient support apparatus for a medical imaging apparatus, such as a magnetic resonance apparatus, is proposed. The patient support apparatus has a couch, a lifting unit for vertical movement of the couch, a travel unit, and at least one sensor unit to detect at least one weight variable for determining the weight of a patient. The at least one sensor unit has at least one sensor element, which is disposed on the lifting unit and/or on the travel unit.Type: GrantFiled: July 3, 2012Date of Patent: April 19, 2016Assignee: SIEMENS AKTIENGESELLSCHAFTInventors: Ludwig Eberler, Razvan Lazar, Volker Matschl, Jürgen Nistler, Wolfgang Renz
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Publication number: 20160077170Abstract: A medical imaging apparatus has a patient-receiving area, with a patient bed for supporting a patient and a sliding-support for movable mounting of the patient bed inside the patient-receiving area with the sliding-support has at least one first sliding-support element, which is arranged on the patient bed, and at least two second sliding-support elements, which are arranged inside the patient-receiving area and that engage a first sliding surface of the at least one first sliding-support element. The sliding-support further has at least one third sliding-support element that, when the patient bed is only partially inside the patient-receiving area, engages a second sliding surface of the at least one first sliding-support element.Type: ApplicationFiled: September 15, 2015Publication date: March 17, 2016Applicant: SIEMENS AKTIENGESELLSCHAFTInventors: Ludwig Eberler, Razvan Lazar, Juergen Nistler, Martin Schramm
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Publication number: 20150253395Abstract: A method for signaling a tuning of an adjustment parameter of an antenna coil arrangement of a magnetic resonance tomograph includes detecting a deviation between an actual adjustment value of at least one adjustment parameter and a required adjustment value of the at least one adjustment parameter. As a function of the deviation, an acoustic and/or a mechanical signal is output in real time to an operator. A device for signaling a tuning of an adjustment parameter of a coil arrangement of a magnetic resonance tomograph, and a magnetic resonance tomograph operating according to the method and/or containing the device are described.Type: ApplicationFiled: March 6, 2015Publication date: September 10, 2015Inventors: Razvan Lazar, Paul Yoe
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Patent number: 9075118Abstract: A magnetic resonance antenna arrangement having a plurality of antenna elements disposed around a measurement chamber and a plurality of switching elements is provided. The antenna elements and the switching elements are disposed and interconnected such that in a first switching configuration of the switching elements, the antenna elements form a first antenna architecture, and in a second switching configuration of the switching elements, the antenna elements form a second antenna architecture.Type: GrantFiled: August 3, 2011Date of Patent: July 7, 2015Assignee: Siemens AktiengesellschaftInventor: Razvan Lazar
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Publication number: 20150054506Abstract: The embodiments relate to a magnetic resonance coil for a magnetic resonance device with a measuring chamber for an examination object and a cylindrical birdcage antenna arrangement having a plurality of antenna elements disposed at least in some areas around a measuring chamber in the form of circumferential antenna rings or axial outer rods connecting the rings. The antenna elements include electric components, e.g., reactive capacitive and/or inductive systems. The magnetic resonance coil also has at least two antenna feeds, e.g., phase-offset in relation to one another by 90°, by which radio-frequency energy is able to be supplied to the birdcage antenna arrangement. The antenna feeds include at least one symmetrical feed via at least one of the electric components of the birdcage antenna arrangement as well is at least one assigned asymmetrical feed between the birdcage antenna arrangement and a screen connection.Type: ApplicationFiled: August 22, 2014Publication date: February 26, 2015Inventors: Ludwig Eberler, Razvan Lazar, Jürgen Nistler
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Publication number: 20150042339Abstract: A device for thermal stabilization of a first electrical characteristic of an antenna array of a magnetic resonance tomograph includes a heat exchanger configured for thermal coupling of a component of the device to a heat source. The device also includes a temperature-dependent second electrical characteristic. In a predefined connection to the antenna array, the temperature-dependent second electrical characteristic is configured to compensate for an effect of a temperature-dependent change on the first electrical characteristic of the antenna array in a predetermined temperature range.Type: ApplicationFiled: August 11, 2014Publication date: February 12, 2015Inventor: Razvan Lazar