Magnetic resonance imaging system and positioning method of implant therefor

    公开(公告)号:US12055613B2

    公开(公告)日:2024-08-06

    申请号:US17304292

    申请日:2021-06-17

    Abstract: Provided in the present application are a magnetic resonance imaging system, a positioning method of an implant therefor, and a non-transitory computer-readable storage medium. The positioning method of the implant for the magnetic resonance imaging system includes: executing a first scanning sequence to obtain original image data and reconstructing an edge image of the implant on the basis of the original image data. The first scanning sequence includes: a radio frequency excitation pulse and a first layer selection gradient pulse corresponding to the radio frequency excitation pulse, the frequency of the radio frequency excitation pulse having a preset offset relative to a center frequency; and a radio frequency refocusing pulse and a second layer selection gradient pulse corresponding to the radio frequency refocusing pulse, the direction of the second layer selection gradient pulse being opposite to the direction of the first layer selection gradient pulse.

    MAGNETIC RESONANCE IMAGING SYSTEM AND POSITIONING METHOD OF IMPLANT THEREFOR

    公开(公告)号:US20210396828A1

    公开(公告)日:2021-12-23

    申请号:US17304292

    申请日:2021-06-17

    Abstract: Provided in the present application are a magnetic resonance imaging system, a positioning method of an implant therefor, and a non-transitory computer-readable storage medium. The positioning method of the implant for the magnetic resonance imaging system includes: executing a first scanning sequence to obtain original image data and reconstructing an edge image of the implant on the basis of the original image data. The first scanning sequence includes: a radio frequency excitation pulse and a first layer selection gradient pulse corresponding to the radio frequency excitation pulse, the frequency of the radio frequency excitation pulse having a preset offset relative to a center frequency; and a radio frequency refocusing pulse and a second layer selection gradient pulse corresponding to the radio frequency refocusing pulse, the direction of the second layer selection gradient pulse being opposite to the direction of the first layer selection gradient pulse.

    MAGNETIC RESONANCE SCANNING SYSTEM AND METHOD

    公开(公告)号:US20250098980A1

    公开(公告)日:2025-03-27

    申请号:US18895047

    申请日:2024-09-24

    Abstract: A magnetic resonance imaging (MRI) scanning system and a method is presented. The method comprises: preconfiguring a plurality of scan configurations, the plurality of scan configurations corresponding to a plurality of scan ranges of a subject to be scanned, and each of the scan configurations comprising an implant-related MRI scan parameter; and executing a scan procedure on the subject to be scanned using at least one of the preconfigured plurality of scan configurations.

    MAGNETIC RESONANCE SYSTEM AND MAGNETIC RESONANCE SCANNING CONTROL METHOD

    公开(公告)号:US20240151788A1

    公开(公告)日:2024-05-09

    申请号:US18501898

    申请日:2023-11-03

    CPC classification number: G01R33/288 A61B5/704 A61B5/743

    Abstract: Embodiments of the present invention disclose a magnetic resonance system and a magnetic resonance scanning control method, the method comprising: acquiring a three-dimensional body model of a scan subject; receiving a user operating instruction to mark an implant in the three-dimensional body model of the scan subject to generate a simulated scan subject; acquiring current positioning information of the scan subject on a scanning table, and determining, on the basis of the current positioning information, virtual positioning information of the simulated scan subject in a virtual space, the virtual space comprising distribution information of a spatial field gradient of the magnetic resonance system; and on the basis of the virtual positioning information, evaluating a safety risk related to the spatial field gradient.

    MRI system, method for determining SAR value of MRI system, and computer-readable storage medium

    公开(公告)号:US11876549B2

    公开(公告)日:2024-01-16

    申请号:US17580967

    申请日:2022-01-21

    CPC classification number: H04B1/3838 G01R33/288

    Abstract: In the present invention, provided are a magnetic resonance imaging system, a method for determining a SAR value of a magnetic resonance imaging system, and a computer-readable storage medium. The system comprises a radio-frequency transmitting coil, configured to receive radio-frequency power from a radio-frequency transmitting link and transmit radio-frequency power required for imaging to a scanned object. The system further comprises a reflection coefficient determining module, a resistance value determining module, and a SAR value determining module. The reflection coefficient determining module is configured to acquire a frequency response of a first input reflection coefficient of the radio-frequency transmitting coil when having no load and a frequency response of a second input reflection coefficient thereof when having the scanned object. The resistance value determining module is configured to determine a resistance value of the radio-frequency transmitting coil on the basis of the frequency response of the first input reflection coefficient, and determine a parallel resistance value of the radio-frequency transmitting coil and the scanned object on the basis of the frequency response of the second input reflection coefficient. The SAR value determining module is configured to calculate a SAR value of the scanned object on the basis of the resistance value of the radio-frequency transmitting coil and the parallel resistance value.

    MRI SYSTEM, METHOD FOR DETERMINING SAR VALUE OF MRI SYSTEM, AND COMPUTER-READABLE STORAGE MEDIUM

    公开(公告)号:US20220278705A1

    公开(公告)日:2022-09-01

    申请号:US17580967

    申请日:2022-01-21

    Abstract: In the present invention, provided are a magnetic resonance imaging system, a method for determining a SAR value of a magnetic resonance imaging system, and a computer-readable storage medium. The system comprises a radio-frequency transmitting coil, configured to receive radio-frequency power from a radio-frequency transmitting link and transmit radio-frequency power required for imaging to a scanned object. The system further comprises a reflection coefficient determining module, a resistance value determining module, and a SAR value determining module. The reflection coefficient determining module is configured to acquire a frequency response of a first input reflection coefficient of the radio-frequency transmitting coil when having no load and a frequency response of a second input reflection coefficient thereof when having the scanned object. The resistance value determining module is configured to determine a resistance value of the radio-frequency transmitting coil on the basis of the frequency response of the first input reflection coefficient, and determine a parallel resistance value of the radio-frequency transmitting coil and the scanned object on the basis of the frequency response of the second input reflection coefficient. The SAR value determining module is configured to calculate a SAR value of the scanned object on the basis of the resistance value of the radio-frequency transmitting coil and the parallel resistance value.

    MONITORING METHOD AND DEVICE FOR MAGNETIC RESONANCE IMAGING SYSTEM AND MAGNETIC RESONANCE IMAGING SYSTEM

    公开(公告)号:US20220026509A1

    公开(公告)日:2022-01-27

    申请号:US17305912

    申请日:2021-07-16

    Abstract: The present invention provides a monitoring method and device for a magnetic resonance imaging system, and a magnetic resonance imaging system. The monitoring method comprises: acquiring a whole body specific absorption rate of a subject under examination; acquiring a ratio between a local region specific absorption rate and the whole body specific absorption rate of the subject under examination on the basis of current parameter information of a local coupling coil in the magnetic resonance imaging system; and calculating the local region specific absorption rate of the subject under examination on the basis of the ratio between the local region specific absorption rate and the whole body specific absorption rate, and the whole body specific absorption rate.

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