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    • 6. 发明申请
    • MAGNETIC RESONANCE THERMOMETRY METHOD
    • 磁共振热分析方法
    • US20100217114A1
    • 2010-08-26
    • US12708838
    • 2010-02-19
    • Xiao Dong ZhouCheng Ni
    • Xiao Dong ZhouCheng Ni
    • A61B5/055
    • G01R33/4804A61B2017/00084A61B2090/374A61N7/02G01K7/36G01K2213/00G01R33/4814
    • A method for reducing errors in the measurement of temperature by magnetic resonance, for use in magnetic resonance imaging-guided HIFU equipment, includes acquiring an MR phase image, as a reference image, before heating an area to be heated with the HIFU equipment; acquiring another MR phase image, as a heated image, during or after the heating by the HIFU equipment; and calculating the temperature change in the heated area according to said heated image and said reference image; and making compensation to said temperature change according to the change in the magnetic field caused by the position change of an ultrasonic transducer in said HIFU equipment. The method can reduce significantly the temperature errors resulting from the position changes of the ultrasonic transducer.
    • 在磁共振成像引导的HIFU设备中使用的用于减小用于磁共振的温度测量误差的方法包括在用HIFU设备加热待加热的区域之前获取作为参考图像的MR相位图像; 在HIFU设备加热期间或之后获取作为加热图像的另一MR相图像; 以及根据所述加热图像和所述参考图像计算加热区域中的温度变化; 并且根据由所述HIFU设备中的超声波换能器的位置变化引起的磁场变化对所述温度变化进行补偿。 该方法可以显着降低由超声波换能器的位置变化引起的温度误差。
    • 7. 发明授权
    • Method for testing magnetic field distribution and apparatus therefor
    • 磁场分布测试方法及其设备
    • US07518366B2
    • 2009-04-14
    • US11900819
    • 2007-09-13
    • Jing GaoCheng NiHong Yan TaoHai Bo Yu
    • Jing GaoCheng NiHong Yan TaoHai Bo Yu
    • G01V3/00
    • G01R33/10G01R33/022
    • The invention proposes a method and an apparatus for testing a magnetic field of a coil. The method comprises applying an alternating current to the coil to generate an alternating magnetic field; measuring simultaneously the induced electromotive potential at a plurality of positions in the alternating magnetic field; and collecting and processing signals of the induced electromotive potential so as to obtain said coil's magnetic field distribution. The apparatus comprises probes positioned in said alternating magnetic field to generate the induced electromotive potential; a multi-channel data acquisition card for collecting the signals of the potential; and a processor for processing the collected signals to obtain said coil's magnetic field distribution. The method and the apparatus eliminate the interference by the magnetic field of the earth by testing the coil's alternating magnetic field to improve test accuracy and to improve the testing efficiency by multi-channel acquisition of the test signals.
    • 本发明提出了一种用于测试线圈的磁场的方法和装置。 该方法包括向线圈施加交流电以产生交变磁场; 同时测量交变磁场中的多个位置处的感应电动势; 并收集和处理感应电动势的信号,以便获得所述线圈的磁场分布。 该装置包括位于所述交变磁场中的探针以产生感应电动势; 一个用于收集潜在信号的多通道数据采集卡; 以及用于处理所收集的信号以获得所述线圈的磁场分布的处理器。 该方法和装置通过测试线圈的交变磁场来消除地球磁场的干扰,提高测试精度,并通过多通道采集测试信号提高测试效率。
    • 9. 发明授权
    • Shimmed magnetic resonance imaging apparatus and shimming method therefor
    • Shimmed磁共振成像装置及其调整方法
    • US07218114B2
    • 2007-05-15
    • US11394629
    • 2006-03-31
    • Cheng NiHui CaoJin Jun ChenZhong You Ren
    • Cheng NiHui CaoJin Jun ChenZhong You Ren
    • G01V3/00
    • G01R33/3873G01R33/3875
    • In a shimming method for an irregular object to be examined by magnetic resonant equipment magnetic field parameters are measured at measurement points located on the surface of an irregular object to be examined. Based on the measured magnetic field parameters, the positions and number of shims for adjusting magnetic field homogeneity are calculated when a passive shimming is to be performed, or the current value in a shimming coil are calculated when an active shimming is to be performed, or at the same time both the positions and number of shims and current value in the shimming coil are calculated when active shimming and passive shimming are to be performed at the same time. Shimming is then performed according to the calculated results. These above steps are repeated until achieving required magnetic field homogeneity. Since the homogeneous region is designed to have an irregular shape, it can provide a better coverage of the irregular object to be examined, and at the same time it reduces the shimming constraints to the unnecessary regions outside the irregular object to be examined, therefore avoiding shimming in those unnecessary regions.
    • 在通过磁共振设备检查的不规则物体的匀场方法中,在位于待检查的不规则物体的表面上的测量点处测量磁场参数。 基于测量的磁场参数,当要执行被动匀场调整时计算用于调整磁场均匀性的垫片的位置和数量,或者当要执行活动匀场时计算匀场线圈中的当前值,或 同时,当同时进行有效匀场和被动匀场时,同时计算匀场线圈的位置和数量以及匀场线圈中的当前值。 然后根据计算结果执行匀场。 重复上述步骤,直到达到所需的磁场均匀性。 由于均匀区域被设计成具有不规则形状,所以可以提供对待检查的不规则物体的更好的覆盖,并且同时将匀场限制减小到待检查的不规则物体之外的不需要的区域,因此避免 在这些不必要的地区。
    • 10. 发明授权
    • Method for reducing magnetic resonance temperature measurement errors in a magnetic resonance monitored HIFU treatment
    • 磁共振监测HIFU治疗中降低磁共振温度测量误差的方法
    • US08638099B2
    • 2014-01-28
    • US13118794
    • 2011-05-31
    • Cheng NiXiao Dong Zhou
    • Cheng NiXiao Dong Zhou
    • G01R33/48A61N7/00
    • A61N7/02A61B2017/00084A61B2090/374G01R33/4804G01R33/4814
    • A method for reducing magnetic resonance temperature measurement errors, which is used for the high-intensity focused ultrasound device for monitoring magnetic resonance imaging includes obtaining a magnetic resonance phase diagram as a reference image before the high-intensity focused ultrasound device heats the heating area; obtaining another magnetic resonance phase diagram as a heating image during or after the heating process of the high intensity focused ultrasound device; calculating the temperature changes in the heating area according to said heating image and reference image. The method further includes measuring the magnetic field changes caused by the position changes of the ultrasonic transducer of said high-intensity focused ultrasound device, and then compensating for the temperature changes according to said magnetic field changes. The present invention can significantly reduce the temperature errors caused by the position changes of the ultrasonic transducer.
    • 用于降低磁共振温度测量误差的方法,用于监测磁共振成像的高强度聚焦超声波装置,包括在高强度聚焦超声装置加热加热区域之前获得作为参考图像的磁共振相位图; 在高强度聚焦超声装置的加热过程中或之后获得另一磁共振相图作为加热图像; 根据所述加热图像和参考图像计算加热区域中的温度变化。 该方法还包括测量由所述高强度聚焦超声装置的超声波换能器的位置变化引起的磁场变化,然后根据所述磁场变化补偿温度变化。 本发明能够显着降低由超声波换能器的位置变化引起的温度误差。