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1. 发明授权

US06396268B1 Magnetic resonance imaging device having magnetic field disturbance compensation 失效
标题翻译：具有磁场干扰补偿的磁共振成像装置
公开(公告)号：US06396268B1
公开(公告)日：2002-05-28
申请号：US09677410
申请日：2000-10-02
申请人： Richard S. Hinks , Scott T. Mansell , Michael J. Radziun , Dewain A. Purgill , Anton M. Linz , Darren L. Hallman
发明人： Richard S. Hinks , Scott T. Mansell , Michael J. Radziun , Dewain A. Purgill , Anton M. Linz , Darren L. Hallman
IPC分类号： G01V300
CPC分类号： G01R33/389
摘要： A magnetic resonance imaging device has a compensation circuit for compensating for magnetic disturbances therein. The compensation circuit includes a sensor for sensing magnetic field changes and generating a magnetic field change signal. The sensor is coupled to a control circuit that has a transfer function therein. The control circuit is used to generate a compensation signal in response to the magnetic field change signal. The compensation signal may be coupled to the compensation coils located by the first magnet portion and the second magnet portion of the device. Also, the compensation signal may produce a time-dependent bias or change the center frequency to cancel magnetic disturbances.
摘要翻译：磁共振成像装置具有用于补偿其中的磁干扰的补偿电路。补偿电路包括用于感测磁场变化并产生磁场变化信号的传感器。传感器耦合到其中具有传递函数的控制电路。控制电路用于响应于磁场变化信号产生补偿信号。补偿信号可以耦合到由设备的第一磁体部分和第二磁体部分定位的补偿线圈。此外，补偿信号可能产生时间偏移或改变中心频率以消除磁扰动。

2. 发明授权

US06375147B1 Vibration isolation apparatus for MR imaging system 失效
标题翻译： MR成像系统的隔振装置
公开(公告)号：US06375147B1
公开(公告)日：2002-04-23
申请号：US09394853
申请日：1999-09-13
申请人： Michael J. Radziun , Scott T. Mansell , David E. Dean , Dewain A. Purgill
发明人： Michael J. Radziun , Scott T. Mansell , David E. Dean , Dewain A. Purgill
IPC分类号： F16M100
CPC分类号： G01R33/3854
摘要： Apparatus which provides a barrier for vibrational energy between an MR imaging system and an associated horizontal support surface includes a stiff platform of substantial mass, which is disposed to carry the entire weight of the MR imaging system. The apparatus further includes a number of vibration isolation elements positioned to support the platform and the MR imaging system upon the horizontal support surface. Each of the isolation elements comprises an enclosure containing pressurized air which is disposed to dampen vibrations, in order to oppose the transmission of vibrations between the platform and the support surface. An air pressure regulator is coupled to respective isolation elements to maintain specified air pressure levels therein, in order to support the platform in selected spaced-apart orientation with respect to the horizontal support surface.
摘要翻译：在MR成像系统和相关联的水平支撑表面之间提供振动能量屏障的装置包括大体积的坚硬平台，其被设置成承载MR成像系统的整个重量。该装置还包括多个隔离元件，其被定位成在水平支撑表面上支撑平台和MR成像系统。每个隔离元件包括包含加压空气的外壳，该加压空气设置成抑制振动，以便抵抗平台和支撑表面之间的振动传递。空气压力调节器联接到相应的隔离元件以在其中保持指定的空气压力水平，以便相对于水平支撑表面以选定的间隔方向支撑平台。

3. 发明授权

US07081752B2 System and method of electrically loading radio-frequency coils using conductive polymers 失效
标题翻译：使用导电聚合物电加载射频线圈的系统和方法
公开(公告)号：US07081752B2
公开(公告)日：2006-07-25
申请号：US10249390
申请日：2003-04-04
申请人： Timothy W. Skloss , Dewain A. Purgill , Roman I. Dachniwskyj , Daniel J. Schaefer , Steven C. Davis , Daniel J. Weyers
发明人： Timothy W. Skloss , Dewain A. Purgill , Roman I. Dachniwskyj , Daniel J. Schaefer , Steven C. Davis , Daniel J. Weyers
IPC分类号： G01V3/00
CPC分类号： G01R33/58
摘要： A system and method including an apparatus for use in electrically loading RF coils of an MRI system is disclosed. The apparatus includes a polymer interdispersed with an electrically conductive additive such that the apparatus provides the necessary electrical loading of the RF coils for testing and calibration of the MRI system but is free of liquid. Furthermore, the apparatus is capable of providing the requisite electrical load in high magnet magnetic fields without introducing image distortion as a result of standing waves within the apparatus.
摘要翻译：公开了一种包括用于电加载MRI系统的RF线圈的装置的系统和方法。该装置包括分散有导电添加剂的聚合物，使得该装置提供RF线圈的必要电负载，用于MRI系统的测试和校准，但是不含液体。此外，该装置能够在高磁场磁场中提供必要的电负载，而不会由于装置内的驻波而引入图像失真。

4. 发明授权

US06252404B1 Reduced noise RF coil apparatus for MR imaging system 失效
标题翻译：用于MR成像系统的降噪RF线圈装置
公开(公告)号：US06252404B1
公开(公告)日：2001-06-26
申请号：US09376543
申请日：1999-08-18
申请人： Dewain A. Purgill , Michael J. Radziun , David E. Dean
发明人： Dewain A. Purgill , Michael J. Radziun , David E. Dean
IPC分类号： G01V300
CPC分类号： G01R33/34007 , G01R33/34046 , G01R33/3854
摘要： In an MR imaging system provided with a main magnet having a bore and with a gradient coil assembly located within the bore, RF coil apparatus is provided for reducing noise in the imaging volume of the MR system. The RF coil apparatus comprises a tubular RF coil form provided with an inner surface, an RF coil attached to the inner surface of the RF coil form, and mounting structure extending between the RF coil form and gradient coil assembly. The mounting structure supports the RF coil and RF coil form upon the gradient coil assembly, in spaced-apart relationship therewith. The apparatus further compises an inner tubular member which is selectively constructed to oppose transmission of acoustic signals from the RF coil to the imaging volume. The inner tubular member is fixably supported within the main magnet bore so as to be in selected spaced-apart relationship with the RF coil and RF coil form, the inner tubular member substantially enclosing a specified portion of the volume of the bore, which comprises the MR system imaging volume.
摘要翻译：在设置有具有孔并具有位于孔内的梯度线圈组件的主磁体的MR成像系统中，提供RF线圈装置以减少MR系统的成像体积中的噪声。 RF线圈装置包括设置有内表面的管状RF线圈形式，附接到RF线圈形式的内表面的RF线圈以及在RF线圈形式和梯形线圈组件之间延伸的安装结构。安装结构在梯度线圈组件上以与其间隔的关系支撑RF线圈和RF线圈形式。该装置进一步组合内部管状构件，该内部管状构件被选择性地构造成抵抗从RF线圈到成像体积的声学信号的传输。内部管状构件可固定地支撑在主磁体孔内，以便与RF线圈和RF线圈形式处于选定的间隔关系，内部管状构件基本上包围孔的体积的特定部分，其包括 MR系统成像体积。

5. 发明授权

US5864273A Cryocooler vibration isolation and noise reduction in magnetic resonance imaging 失效
标题翻译：冷却器在磁共振成像中的隔振和降噪
公开(公告)号：US5864273A
公开(公告)日：1999-01-26
申请号：US814909
申请日：1997-03-12
申请人： David E. Dean , Clifford J. Ginfrida , Scott Thomas Mansell , Thomas M. Nixon , Dewain A. Purgill , Michael James Radziun
发明人： David E. Dean , Clifford J. Ginfrida , Scott Thomas Mansell , Thomas M. Nixon , Dewain A. Purgill , Michael James Radziun
IPC分类号： A61B5/055 , F17C13/00 , F25D19/00 , G01R33/3815 , H01F6/00 , H01F6/04 , H01F1/00
CPC分类号： F25D19/006 , G01R33/3815 , H01F6/04 , Y10S505/892
摘要： Vibration and noise isolation for a magnetic resonance imager (MRI) superconducting magnet cryocooler includes a bellows between the cryocooler and its vacuum sleeve in the magnet, a mass suspended along the axis of, but at a distance from, the cryocooler, elastomeric blocks parallel to the axis, and braided copper wires connecting the vacuum sleeve and the heat shields of the MRI. Motion limiters and bellows flexures are provided for dynamic loads which might be encountered during transport of the magnet.
摘要翻译：用于磁共振成像器（MRI）超导磁体制冷机的振动和噪声隔离包括在低温冷却器和磁体中的真空套筒之间的波纹管，沿着低温冷却器的轴线但距离冷却器一定距离的质量块，平行于轴线和连接真空套管和MRI屏蔽层的编织铜线。运动限制器和波纹管弯曲件用于在磁体运输过程中可能遇到的动态载荷。

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