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公开(公告)号：US06294972B1
公开(公告)日：2001-09-25
申请号：US09716779
申请日：2000-11-20
IPC分类号： G01V300
CPC分类号： G01R33/3875 , G01R33/3873
摘要： A local head coil for an MRI system includes a passive shim assembly having ferroshims placed to reduce B0 field inhomogeneities caused by susceptibility effects in the subject being imaged. A prescan is performed with the subject in place to measure B0 field inhomogeneities and the passive shim assembly is tailored to the subject by attaching ferroshim inserts based on these measurements.
摘要翻译： 用于MRI系统的局部头部线圈包括被放置的电子垫片的被动垫片组件，以减少由被成像的被摄体中的易感性影响引起的B0场不均匀性。 执行预扫描以使受试者到位以测量B0场不均匀性，并且基于这些测量，通过附加ferroshim插入物来对受试者定制被动垫片组件。
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2.发明授权Methods and apparatus for post-exposure determination of ionizing radiation dose 有权电离辐射剂量暴露后测定方法和装置公开(公告)号：US07084628B2
公开(公告)日：2006-08-01
申请号：US10731552
申请日：2003-12-08
IPC分类号： G01V3/00
摘要： The instant invention provides in-vivo methods and apparatus for radiation dosimetry assessment in individuals exposed to potentially harmful radiation, based on measurements in-situ of the teeth. The in vivo dosimetry assessment methods and apparatus utilize electron paramagnetic resonance (EPR) techniques; and employ an apparatus comprising an integrated EPR spectrometer system, an ergonomic magnet and a constructed resonator structure. In various aspects, the dosimetry assessment apparatus is configured to be easily portable and withstand potentially adverse mechanical effects of transportation and deployment in the field. The apparatus also is configured with a power supply that is compatible with both conventional AC line voltages and/or other sources of power suitable for field conditions; and may be easily operated by minimally trained technicians to quickly generate a readout of estimated radiation exposure dose.
摘要翻译： 本发明提供了基于在牙齿原位测量的暴露于潜在有害辐射的个体中的放射剂量测定评估的体内方法和装置。 体内剂量学评估方法和装置利用电子顺磁共振（EPR）技术; 并采用包括集成EPR光谱仪系统，符合人体工程学的磁体和构造的谐振器结构的装置。 在各个方面，剂量测定评估装置被配置为容易携带并且承受在现场的运输和部署的潜在不利的机械效应。 该装置还配置有与常规AC线路电压和/或适用于现场条件的其它电源兼容的电源; 并且可以由训练有素的技术人员容易地操作以快速产生估计的辐射照射剂量的读数。
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公开(公告)号：US08536870B2
公开(公告)日：2013-09-17
申请号：US13066075
申请日：2011-04-06
IPC分类号： G01V3/00
CPC分类号： G01R33/3875
摘要： The present invention is a portable in-bore shim coil insert suitable for correcting high-degree and high-order magnetic field inhomogeneities over a limited examination zone in a magnetic resonance assembly operating above 3 T magnetic field strengths, wherein the magnetic resonance assembly includes at least a MRI magnet having an internal bore of known configuration and volume, at least one set of gradient coils, and an arrangement of radio frequency coils. The in-bore shim coil insert and corresponding method of use is able to produce higher degree and order shimming effects on-demand (i.e., the correction of at least some 3rd to 6th degree field terms or inhomogeneities) and will markedly improve the quality of in-vivo magnetic resonance spectroscopy and/or imaging of any desired anatomic site, i.e., any or all of the various organs, tissues, and systems present in the body of a living subject.
摘要翻译： 本发明是一种便携式内孔衬垫线圈插件，其适用于在高于3T磁场强度的高于3T磁场强度的磁共振组件中的有限检查区域上校正高度和高次磁场不均匀性，其中磁共振组件包括 具有已知构造和体积的内部孔的至少一个MRI磁体，至少一组梯度线圈和射频线圈的布置。 孔内垫片线圈插入物和相应的使用方法能够根据需要产生更高程度和顺序的匀场效果（即，校正至少三到六度场项或不均匀性），并将显着提高质量 体内磁共振光谱学和/或任何所需解剖部位的成像，即存在于活体的身体中的各种器官，组织和系统的任何或全部。
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公开(公告)号：US06788060B1
公开(公告)日：2004-09-07
申请号：US10250014
申请日：2003-05-28
IPC分类号： G01V300
CPC分类号： G01R33/3875 , G01R33/3873
摘要： An imaging system 10 is provided comprising an imaging magnet 16 having a magnet bore 18. A plurality of passive shims 26 is positioned within the magnet bore 18. A plurality of resistive shims 46 is also positioned within the magnet bore 18. A plurality of thermometers 28 is coupled thermally to a select number of the plurality of passive shims 26 and read a passive shim temperature 36. A controller 32 is in communication with the plurality of thermometers 28 and the plurality of resistive shims 46. The controller 32 includes logic adapted to adjust control currents 40 sent to each of the plurality of resistive shims 46 in response to the resistive shim temperatures 36 received from each of the thermometers 28 such that the strength of the magnetic field and its homogeneity is maintained.
摘要翻译： 提供了一种成像系统10，其包括具有磁体孔18的成像磁体16.多个被动垫片26定位在磁体孔18内。多个电阻垫片46也位于磁体孔18内。多个温度计 28被热耦合到多个被动垫片26的选定数量并读取被动垫片温度36.控制器32与多个温度计28和多个电阻垫片46连通。控制器32包括适于 调节响应于从每个温度计28接收的电阻垫片温度36而发送到多个电阻垫片46中的每一个的控制电流40，使得维持磁场的强度及其均匀性。
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公开(公告)号：US5136243A
公开(公告)日：1992-08-04
申请号：US509307
申请日：1990-04-16
CPC分类号： G01R33/34038 , G01R33/24 , G01R33/243
摘要： Antenna means are provided for mapping a static magnetic field comprising an array of impedence matched untuned antenna elements with linear dimensions greater than several wavelengths of radio frequency used for nuclear magnetic resonance (NMR) or electron spin resonance (ESR). The antenna elements comprise one or more electrical conductors housed within and electrically insulated from a solid shield surrounding the conductor(s). The solid shield contains a void volume filled with a sample adapted for use in NMR or ESR.
摘要翻译： 提供天线装置用于映射包括具有大于用于核磁共振（NMR）或电子自旋共振（ESR）的射频的几个波长的线性尺寸的阻抗匹配的未被谐振的天线元件的阵列的静态磁场。 天线元件包括一个或多个电导体，其被容纳在围绕导体的固体屏蔽层内并与之绝缘。 固体屏蔽包含填充有适用于NMR或ESR的样品的空隙体积。
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公开(公告)号：US20110260727A1
公开(公告)日：2011-10-27
申请号：US13066075
申请日：2011-04-06
IPC分类号： G01R33/32
CPC分类号： G01R33/3875
摘要： The present invention is a portable in-bore shim coil insert suitable for correcting high-degree and high-order magnetic field inhomogeneities over a limited examination zone in a magnetic resonance assembly operating above 3 T magnetic field strengths, wherein the magnetic resonance assembly includes at least a MRI magnet having an internal bore of known configuration and volume, at least one set of gradient coils, and an arrangement of radio frequency coils. The in-bore shim coil insert and corresponding method of use is able to produce higher degree and order shimming effects on-demand (i.e., the correction of at least some 3rd to 6th degree field terms or inhomogeneities) and will markedly improve the quality of in-vivo magnetic resonance spectroscopy and/or imaging of any desired anatomic site, i.e., any or all of the various organs, tissues, and systems present in the body of a living subject.
摘要翻译： 本发明是一种便携式内孔衬垫线圈插件，其适用于在高于3T磁场强度的高于3T磁场强度的磁共振组件中的有限检查区域上校正高度和高次磁场不均匀性，其中磁共振组件包括 具有已知构造和体积的内部孔的至少一个MRI磁体，至少一组梯度线圈和射频线圈的布置。 孔内垫片线圈插入物和相应的使用方法能够根据需要产生更高程度和顺序的匀场效果（即，校正至少三到六度场项或不均匀性），并将显着提高质量 体内磁共振光谱学和/或任何所需解剖部位的成像，即存在于活体的身体中的各种器官，组织和系统的任何或全部。
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公开(公告)号：US5313164A
公开(公告)日：1994-05-17
申请号：US982481
申请日：1992-11-27
IPC分类号： G01R33/24 , G01R33/28 , G01R33/3873 , G01R33/3875 , G01R33/20
CPC分类号： G01R33/24 , G01R33/28 , G01R33/3873 , G01R33/3875
摘要： Apparatus for mapping a static magnetic field is provided. An NMR-suitable sample or array of samples is positioned in a magnetic field probe adapted to generate an alternating magnetic field and for measuring an induced signal from the sample as a result of being exposed to the alternating magnetic field. The induced signal from the sample is measured at discrete points along a helispherical or heliellipsoidal path located within the static magnetic field. Shim coils can be positioned within the static magnetic field and the current directed to the coils can be controlled as a result of the field mapping results in order to homogenize the static magnetic field. Ferromagnetic elements can be inserted in appropriate locations instead of, or in addition to, the shim coils. One such probe or any array of such probes are mounted on an actuator mechanism, which mechanism moves the probe or array of probes along a helispherical or heliellipsoidal path located within the static magnetic field. Induced signals are acquired from each probe at each of the positions along the path of the mechanism.
摘要翻译： 提供了用于映射静磁场的装置。 NMR适合的样品或样品阵列位于适于产生交变磁场的磁场探针中，并且用于通过暴露于交变磁场来测量来自样品的感应信号。 来自样品的感应信号是沿着位于静磁场内的一个尖状或直立线路径的离散点测量的。 垫圈线圈可以位于静态磁场内，并且可以通过场映射结果来控制引导到线圈的电流，以便使静态磁场均匀化。 铁磁元件可以插入适当的位置，而不是垫圈线圈，或除了垫片线圈之外。 一个这样的探针或这种探针的任何阵列安装在致动器机构上，该机构沿着位于静磁场内的一个旋转或者直立线路径移动探头或探针阵列。 在沿着机构的路径的每个位置处从每个探针获取诱导信号。
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公开(公告)号：US4949044A
公开(公告)日：1990-08-14
申请号：US364310
申请日：1989-06-09
IPC分类号： G01R33/30 , G01R33/3875 , H01F7/20
CPC分类号： H01F7/20 , G01R33/30 , G01R33/3875
摘要： Apparatus for mapping a static magnetic field is provided. A liquid sample is positioned in a magnetic field probe adapted to generate an alternating magnetic field and for measuring an induced signal from the sample as a result of being exposed to the alternating magnetic field. The induced signal from the sample is measured at discrete points along a helical path located within the static magnetic field. Axial and radial shim coils can be positioned within the static magnetic field and the current directed to the coils can be controlled as a result of the field mapping results in order to homogenize the static magnetic field.
摘要翻译： 提供了用于映射静磁场的装置。 液体样品位于适于产生交变磁场的磁场探针中，并且由于暴露于交变磁场而用于测量来自样品的感应信号。 在位于静磁场内的螺旋路径的离散点处测量来自样品的感应信号。 轴向和径向垫片线圈可以定位在静态磁场内，并且作为场映射结果的结果可以控制引导到线圈的电流，以使静磁场均匀化。
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公开(公告)号：US4949043A
公开(公告)日：1990-08-14
申请号：US365048
申请日：1989-06-09
IPC分类号： G01R33/30 , G01R33/3875 , H01F7/20
CPC分类号： G01R33/30 , G01R33/3875 , H01F7/20
摘要： Apparatus is provided for rendering uniform a static magnetic field which includes a plurality of radial and axial coils connected to a controlled power supply. This apparatus permits control of at least the first six orders of gradient of the static magnetic field.
摘要翻译： 提供用于使静态磁场均匀的装置，其包括连接到受控电源的多个径向和轴向线圈。 该装置允许至少控制静态磁场的前六阶梯度。
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公开(公告)号：US4862087A
公开(公告)日：1989-08-29
申请号：US182953
申请日：1988-04-18
IPC分类号： G01R33/30 , G01R33/3875 , H01F7/20
CPC分类号： H01F7/20 , G01R33/30 , G01R33/3875
摘要： Apparatus such as high resolution nuclear magnetic resonance apparatus is provided which includes a large volume having a homogeneous static magnetic field generated by a solenoid magnet within which a plurality of stationary samples can be analyzed concomitantly. The static magnetic field is rendered homogeneous by means of a plurality of radial and axial coils connected to a controlled power supply.
摘要翻译： 提供了诸如高分辨率核磁共振装置的装置，其包括具有由螺线管磁体产生的均匀静磁场的大体积，其中可以同时分析多个静止样本。 通过连接到受控电源的多个径向和轴向线圈使静磁场变得均匀。
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