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1. 发明授权

US5365927A Magnetic resonance imaging system with pointing device 失效
标题翻译：具有指向装置的磁共振成像系统
公开(公告)号：US5365927A
公开(公告)日：1994-11-22
申请号：US146345
申请日：1993-11-02
申请人： Peter B. Roemer , Samuel M. Blumenfeld , Kirby G. Vosburgh , Harvey E. Cline , William D. Barber , William E. Lorensen , Richard L. St. Peters , John F. Schenck , Charles L. Dumoulin , Robert D. Darrow , Christopher J. Hardy
发明人： Peter B. Roemer , Samuel M. Blumenfeld , Kirby G. Vosburgh , Harvey E. Cline , William D. Barber , William E. Lorensen , Richard L. St. Peters , John F. Schenck , Charles L. Dumoulin , Robert D. Darrow , Christopher J. Hardy
IPC分类号： G01R33/48 , A61B5/055 , G01R33/28 , G01R33/38 , G01R33/385 , G01R33/54 , G01R33/563
CPC分类号： G01R33/385 , G01R33/3806 , G01R33/285 , G01R33/4804 , G01R33/543 , G01R33/563
摘要： A magnetic resonance (MR) imaging system for use in a medical procedure employs an open main magnet allowing access to a portion of a patient within an imaging volume, for producing a main magnetic field over the imaging volume; a set of open gradient coils which provide magnetic fields gradients over the imaging volume without restricting access to the imaging volume; a radiofrequency coil set for transmitting RF energy into the imaging volume to nutate nuclear spins within the imaging volume and receive an MR response signal from the nuclear spins; and a pointing device for indicating the position and orientation of a plane in which an image is to be acquired; an image control means for operating power supplies for the gradient coils and the RF coils to acquire an MR signal from the desired imaging plane; and a computation unit for constructing an image of the desired imaging plane. The MR imaging system is intended to operate to provide images to a physician during medical procedures to guide the physician in his procedures.
摘要翻译：用于医疗过程的磁共振（MR）成像系统采用打开的主磁体，其允许进入成像体积内的患者的一部分，用于在成像体积上产生主磁场; 一组开放的梯度线圈，其在成像体积上提供磁场梯度，而不限制对成像体积的访问; 射频线圈组，用于将RF能量传输到成像体积中，以在成像体积内盘旋核自旋，并从核自旋接收MR响应信号; 以及指示装置，用于指示要获取图像的平面的位置和方位; 图像控制装置，用于操作梯度线圈和RF线圈的电源，以从期望的成像平面获取MR信号; 以及用于构造所需成像平面的图像的计算单元。 MR成像系统旨在在医疗程序期间向医生提供图像以在他的程序中指导医师。

2. 发明授权

US5377678A Tracking system to follow the position and orientation of a device with radiofrequency fields 失效
标题翻译：跟踪系统遵循具有射频场的设备的位置和方向
公开(公告)号：US5377678A
公开(公告)日：1995-01-03
申请号：US91419
申请日：1993-07-14
申请人： Charles L. Dumoulin , Robert D. Darrow , John F. Schenck , Peter B. Roemer
发明人： Charles L. Dumoulin , Robert D. Darrow , John F. Schenck , Peter B. Roemer
IPC分类号： A61B5/06 , A61B6/12 , A61B10/00 , A61B10/02 , A61B17/34 , A61B19/00 , A61M25/01 , A61B5/00 , A61B6/00
CPC分类号： A61B10/0233 , A61B34/20 , A61B5/06 , A61B6/12 , A61B17/3403 , A61B2034/2051 , A61B2090/365 , A61B2090/3958
摘要： A tracking system in which radiofrequency signals emitted by an invasive device such as a catheter, are detected and used to measure the position and orientation of the invasive device. The invasive device has a transmit coil attached near its end and is driven by a low power RF source to produce a dipole electromagnetic field that can be detected by an array of receive coils distributed around a region of interest. The position and orientation of the device as determined by the tracking system are superimposed upon independently acquired Medical Diagnostic images, thereby minimizing the radiographic exposure times. One or more invasive devices can be simultaneously tracked.
摘要翻译：检测由诸如导管的侵入性装置发射的射频信号并用于测量侵入性装置的位置和取向的跟踪系统。侵入性装置具有靠近其端部附接的发射线圈并且由低功率RF源驱动以产生可以通过分布在感兴趣区域周围的接收线圈阵列来检测的偶极电磁场。由跟踪系统确定的装置的位置和方向被叠加在独立获取的医学诊断图像上，从而使放射照相曝光时间最小化。可以同时跟踪一个或多个入侵设备。

3. 发明授权

US4812760A Multi-dimensional selective NMR excitation with a single RF pulse 失效
标题翻译：具有单个RF脉冲的多维选择性NMR激发
公开(公告)号：US4812760A
公开(公告)日：1989-03-14
申请号：US78427
申请日：1987-07-27
申请人： Paul A. Bottomley , Christopher J. Hardy , Matthew O'Donnell , Peter B. Roemer
发明人： Paul A. Bottomley , Christopher J. Hardy , Matthew O'Donnell , Peter B. Roemer
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/20
CPC分类号： G01R33/446
摘要： A single rotating NMR .pi. pulse provides simultaneous spatially-selective inversion or spin-echo refocussing of nuclear pins in two orthogonal dimensions. The two-dimensional spatially-selective pulse utilizes a single RF pulse, with either a square of an amplitude-modulated or a frequency-modulated envelope, and applied in the presence of an amplitude-modulated magnetic field gradient which reorients through the desired dimensions in which selection is desired while the RF pulse is present. These rotating, or ".rho.", pulses are useful for reduction of aliasing signal artifacts is restricted field-of-view high-resolution NMR imaging and, when combined with one-dimensional-localized chemical shift spectroscpoy techniques (such as those employing surface detection coils) is especially useful for the production of three-dimensionally localized NMR spectra. Substantial suppression of undesirable residual excited signals, arising from outside the desired two-dimensional spatially selected region, can be obtained by simulated annealing optimization of both the RF and magnetic field gradient amplitude portions of the .rho. pulse and/or by use of surface coil detection. The location of the selected volume is varied by frequency modulation of the RF signal pulse, or by variation of the ratio of currents in the halves of the magnetic field gradient coils.

4. 发明授权

US5027071A Method of, and apparatus for, NMR slice selection 失效
标题翻译： NMR切片选择的方法和装置
公开(公告)号：US5027071A
公开(公告)日：1991-06-25
申请号：US489124
申请日：1990-03-05
申请人： Christopher J. Hardy , Peter B. Roemer , Otward M. Mueller
发明人： Christopher J. Hardy , Peter B. Roemer , Otward M. Mueller
IPC分类号： A61B5/055 , G01R33/32 , G01R33/36 , G01R33/385 , G01R33/387 , G01R33/54 , G01R33/565 , G06T1/00
CPC分类号： G01R33/385 , G01R33/56518 , G01R33/3607 , G01R33/3852
摘要： A method of reducing slice profile degradation due to gradient signal amplitude ripple, has steps of: sensing the gradient signal ripple amplitude; normalizing the sensed ripple signal amplitude responsive to the gradient amplitude commanded; and modulating the RF signal amplitude with the adjusted-amplitude ripple signal, to cause the RF and gradient magnetic fields to have an effective vector pointing substantially in the same direction, during the slice-selection interval, as would the effective field vector formed with a gradient field devoid of ripple. Apparatus for reducing the slice profile degradation modulates the RF signal with the ripple envelope obtained from the output of the gradient signal amplifier, by a signal controlled by the gradient amplifier input.

5. 发明授权

US5742164A Misalignment compensation for MR gradient coil assembly 失效
标题翻译： MR梯形线圈组件的未对准补偿
公开(公告)号：US5742164A
公开(公告)日：1998-04-21
申请号：US579755
申请日：1995-12-28
申请人： Peter B. Roemer , William D. Barber
发明人： Peter B. Roemer , William D. Barber
IPC分类号： G01R33/565 , G01V3/00 , G01V3/14
CPC分类号： G01R33/56518
摘要： The invention is directed to a gradient coil assembly for MR imaging which includes a gradient coil set comprising inner and outer gradient coils, the inner gradient coil located within the outer gradient coil and surrounding or otherwise proximate to an imaging volume. The system further includes means for selectively energizing the inner and outer gradient coils to generate a resultant gradient field in the imaging volume. The energized inner and outer gradient coils are also disposed to collectively generate an eddy current field component in a region between the outer coil and a conductive structure spaced-apart therefrom when the inner gradient coil is displaced along an axis from a specified position with respect to the outer gradient coil. A compensation coil is selectively positioned with respect to the inner and outer gradient coils, and means are provided for applying a compensation current to the compensation coil to generate a magnetic field which substantially cancels the eddy current component, the compensation current and the displacement of the inner coil along the axis from the specified position having a specified relationship.
摘要翻译：本发明涉及用于MR成像的梯度线圈组件，其包括梯度线圈组，该梯度线圈组包括内部和外部梯度线圈，内部梯度线圈位于外部梯度线圈内并且围绕成像体积或以其他方式接近成像体积。该系统还包括用于选择性地激励内部和外部梯度线圈以在成像体积中产生合成梯度场的装置。激励的内部和外部梯度线圈也被设置成在外部线圈和与其间隔开的导电结构之间的区域中共同地产生涡流场分量，当内部梯度线圈沿着轴线相对于相对于外梯度线圈。补偿线圈相对于内部和外部梯度线圈选择性地定位，并且提供用于向补偿线圈施加补偿电流以产生基本上抵消涡流分量，补偿电流和补偿电流的位移的磁场的装置内部线圈沿着具有指定关系的指定位置的轴线。

6. 发明授权

US5378989A Open gradient coils for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的开放梯度线圈
公开(公告)号：US5378989A
公开(公告)日：1995-01-03
申请号：US146346
申请日：1993-11-02
申请人： William D. Barber , Peter B. Roemer , Kenneth W. Rohling
发明人： William D. Barber , Peter B. Roemer , Kenneth W. Rohling
IPC分类号： G01R33/38 , G01R33/385 , G01R33/421 , G01V3/00
CPC分类号： G01R33/385 , G01R33/3802 , G01R33/3806 , G01R33/4215
摘要： A magnetic field gradient apparatus for use in a magnetic resonance (MR) imaging system employing open magnets allows access to a patient while the patient is being imaged. The magnetic field gradient apparatus employs two gradient coil assemblies and a gradient coil amplifier. Each gradient coil assembly has a gradient coil carrier with at least one gradient coil disposed on it. Each gradient coil carrier is comprised of a cylinder with a flange at one end. The gradient coil assemblies are positioned in the bore of each ring of the open magnet and spaced apart from each other allowing access to the patient. The gradient coil amplifier provides current through the gradient coils to create a magnetic field gradient which has high linearity inside an imaging volume. A coil is disposed on cylinders which surround each gradient coil assembly and fit inside the bore of each ring which acts as an active shield and minimizing eddy currents in conductors outside the gradient coil assemblies.
摘要翻译：用于使用开放磁体的磁共振（MR）成像系统中的磁场梯度装置允许在患者被成像时进入病人。磁场梯度装置采用两个梯度线圈组件和一个梯度线圈放大器。每个梯度线圈组件具有梯度线圈架，其上布置有至少一个梯度线圈。每个梯度线圈架由一端具有凸缘的气缸组成。梯度线圈组件定位在开放磁体的每个环的孔中并彼此间隔开，允许进入患者。梯度线圈放大器通过梯度线圈提供电流，以产生在成像体积内具有高线性度的磁场梯度。线圈设置在围绕每个梯度线圈组件并且装配在每个环的孔内的气缸上，其用作主动屏蔽并且使梯度线圈组件外部的导体中的涡流最小化。

7. 发明授权

US5179338A Refrigerated superconducting MR magnet with integrated gradient coils 失效
标题翻译：具有集成梯度线圈的冷冻超导MR磁体
公开(公告)号：US5179338A
公开(公告)日：1993-01-12
申请号：US759337
申请日：1991-09-13
申请人： Evangelos T. Laskaris , Peter B. Roemer , Bizhan Dorri , Mark E. Vermilyea
发明人： Evangelos T. Laskaris , Peter B. Roemer , Bizhan Dorri , Mark E. Vermilyea
IPC分类号： G01R33/3815 , G01R33/385 , G01R33/3873 , G01R33/422
CPC分类号： G01R33/385 , G01R33/3815 , G01R33/3873 , G01R33/422
摘要： The invention relates to refrigerated superconducting MR magnets having integrated gradient coils. In particular, the amount of eddy currents produced by the magnet are substantially reduced while reducing the size and weight, and, therefore, the cost of the superconducting magnet required to produce an MR image.
摘要翻译：本发明涉及具有积分梯度线圈的冷冻超导MR磁体。特别地，磁体产生的涡流的量大大减小，同时减小了产生MR图像所需的超导磁体的尺寸和重量，并因此降低了超导磁体的成本。

8. 发明授权

US5017871A Gradient current speed-up circuit for high-speed NMR imaging system 失效
标题翻译：用于高速NMR成像系统的梯度电流加速电路
公开(公告)号：US5017871A
公开(公告)日：1991-05-21
申请号：US407180
申请日：1989-09-14
申请人： Otward M. Mueller , Peter B. Roemer , William A. Edelstein
发明人： Otward M. Mueller , Peter B. Roemer , William A. Edelstein
IPC分类号： G01R33/20 , A61B5/055 , G01R33/385
CPC分类号： G01R33/3852
摘要： A gradient current speed-up circuit, for use in a higher-speed NMR imaging system with a gradient power amplifier and an associated gradient, coil, has a high-voltage power supply which is selectively connected to the associated gradient coil, typical via a plurality of semiconductor switching elements, to supply a pulse of a very high voltage when fast coil rise and fall times are needed. The gradient coil is connected between selected ones of semiconductors devices which are turned on and off in selected patterns, to cause the direction of coil current flow to be determined.

9. 发明授权

US4614930A Radially magnetized cylindrical magnet 失效
标题翻译：径向磁化圆柱形磁铁
公开(公告)号：US4614930A
公开(公告)日：1986-09-30
申请号：US715709
申请日：1985-03-25
申请人： John S. Hickey , Peter B. Roemer
发明人： John S. Hickey , Peter B. Roemer
IPC分类号： G01R33/383 , A61B5/055 , A61B10/00 , G01R33/20 , H01F7/02
CPC分类号： H01F7/0278
摘要： A permanent magnet assembly for use in magnetic resonance imagers requires a minimum of permanent magnet material. The magnets are arranged with a radial direction of magnetization and an iron return path is used. The specific configurations of the permanent magnets provide highly uniform magnetic fields in the bore of the assembly.
摘要翻译：用于磁共振成像器的永磁体组件需要最少的永久磁铁材料。磁体被布置成具有径向磁化方向，并且使用铁返回路径。永磁体的具体构造在组件的孔中提供高度均匀的磁场。

10. 发明授权

US5804969A MRI RF coil 失效
标题翻译： MRI射频线圈
公开(公告)号：US5804969A
公开(公告)日：1998-09-08
申请号：US847431
申请日：1997-04-24
申请人： Jianyu Lian , Peter B. Roemer
发明人： Jianyu Lian , Peter B. Roemer
IPC分类号： G01R33/3415 , G01R33/32
CPC分类号： G01R33/3415
摘要： An MRI RF coil has two resonant rings disposed along an axis. The resonant rings are inductively coupled, but are otherwise electrically isolated from one another. In an assembly having two such MRI RF coils, a decoupling element (e.g., a decoupling capacitor or inductor) electrically connected between one ring of one coil and one ring of the other coil decouples the coils.
摘要翻译： MRI RF线圈具有沿轴线设置的两个谐振环。谐振环感应耦合，但彼此电隔离。在具有两个这样的MRI RF线圈的组件中，电连接在一个线圈的一个环和另一个线圈的一个环之间的去耦元件（例如，去耦电容器或电感器）使线圈解耦。

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