专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明授权

US5225782A Eddy current free MRI magnet with integrated gradient coils 失效
标题翻译：具有积分梯度线圈的涡流无磁共振磁铁
公开(公告)号：US5225782A
公开(公告)日：1993-07-06
申请号：US759389
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 , G01R33/421
CPC分类号： G01R33/3815 , G01R33/385 , G01R33/421
摘要： This invention relates to refrigerated superconducting eddy current free MR magnets having integrated gradient coils. In particular, the amount of resultant 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 acceptable MR image.
摘要翻译：本发明涉及具有积分梯度线圈的冷冻超导无涡流MR磁体。特别地，由磁体产生的涡流的量大大降低，同时减小了尺寸和重量，并因此降低了产生可接受的MR图像所需的超导磁体的成本。

22. 发明授权

US5063349A Transformer-coupled gradient speed-up circuit 失效
标题翻译：变压器耦合梯度速度电路
公开(公告)号：US5063349A
公开(公告)日：1991-11-05
申请号：US533233
申请日：1990-06-04
申请人： Peter B. Roemer , Otward M. Mueller , John N. Park , William McMurray
发明人： Peter B. Roemer , Otward M. Mueller , John N. Park , William McMurray
IPC分类号： A61B5/055 , G01R33/385 , G01R33/48 , H01F7/20
CPC分类号： G01R33/3852
摘要： A gradient current speed-up circuit, for use in a higher-speed NMR imaging system having an associated gradient coil, has a gradient power amplifier receiving an input analog signal controlling amplifier output current, and a transformer having a primary winding and a pair of secondary windings connected in series with the amplifier output and the coil. Semiconductor switching elements selectively connect the primary winding between first and second potential sources, and are turned on and off in selected patterns to cause a current to be suddenly applied to, and removed from, flow through the associated gradient coil; the amplifier output current is changed with the gradient coil current lags behind an amplitude commanded by a master input signal.

23. 发明授权

US4772839A Rotor position estimator for switched reluctance motor 失效
标题翻译：开关磁阻电机的转子位置估计器
公开(公告)号：US4772839A
公开(公告)日：1988-09-20
申请号：US113048
申请日：1987-10-27
申请人： Stephen R. MacMinn , Peter B. Roemer
发明人： Stephen R. MacMinn , Peter B. Roemer
IPC分类号： H02P6/16 , H02P6/18 , H02P25/08 , H02P8/00
CPC分类号： H02P6/185 , H02P25/089
摘要： An indirect position estimator for a switched reluctance motor applies short duration, low level sensing pulses to two unenergized phases of the motor. A change in phase current during a sampling period, resulting from the application of the sensing pulse, is sensed and processed to produce an indication of a pair of estimated angles for each of the unenergized phases. A pair of angles for one such unenergized phase is shifted by a value equal to the phase displacement between the two unenergized phases and the shifted angles are then compared to the angles of the second phase to determine which angles match. The matching angle is produced as a signal indicative of the estimated instantaneous rotor position. If any stator phase changes state during the sampling period, or if the two initially unenergized phases do not remain unenergized throughout the sampling period, a signal corresponding to an extrapolated rotor position is produced instead of the signal indicative of estimated instantaneous rotor position. Extrapolation preferably includes a least squares recursive estimation, with exponential forgetting, of speed.
摘要翻译：用于开关磁阻电动机的间接位置估计器将短时间，低电平感测脉冲施加到电动机的两个未通电状态。感测和处理由施加感测脉冲导致的采样周期内的相电流变化，以产生每个未通电相位的一对估计角度的指示。一个这样的未通电相位的一对角度移动等于两个未通电相位之间的相位位移的值，然后将移动的角度与第二相位的角度进行比较以确定哪个角度匹配。产生匹配角度作为表示估计的瞬时转子位置的信号。如果在采样周期期间任何定子相位改变状态，或者如果两个最初未通电的相位在整个采样周期内不被保持不通电，则产生对应于外推转子位置的信号，而不是指示估计的瞬时转子位置的信号。外推优选地包括具有指数忘记速度的最小二乘递归估计。

24. 发明授权

US4737716A Self-shielded gradient coils for nuclear magnetic resonance imaging 失效
标题翻译：用于核磁共振成像的自屏梯度线圈
公开(公告)号：US4737716A
公开(公告)日：1988-04-12
申请号：US826650
申请日：1986-02-06
申请人： Peter B. Roemer , John S. Hickey
发明人： Peter B. Roemer , John S. Hickey
IPC分类号： G01R33/3875 , A61B5/055 , A61B6/03 , A61B10/00 , G01N33/22 , G01R33/20 , G01R33/385 , G01R33/421 , G01R33/44 , H01F7/20
CPC分类号： G01R33/385 , G01R33/4215
摘要： A two coil system is described which produces a linear gradient field inside and an arbitrarily low field outside the two coil set. By eliminating the field outside the gradient coils, interaction between the gradient coils and external structure can be eliminated. A reduction in eddy current effects of greater than a factor 100 are readily obtained. Two coils are required for each gradient axis instead of one so that some increase in power supply capability may be required.
摘要翻译：描述了在两个线圈组之外产生线性梯度场和任意低场的二线圈系统。通过消除梯度线圈外的场，可以消除梯度线圈与外部结构之间的相互作用。易于获得大于因子100的涡流效应的降低。每个梯度轴需要两个线圈，而不是一个线圈，因此可能需要一些电源能力的增加。

25. 发明授权

US08384386B2 Dedicated system for msk joint imaging 有权
标题翻译：专用系统用于msk联合成像
公开(公告)号：US08384386B2
公开(公告)日：2013-02-26
申请号：US12615385
申请日：2009-11-10
申请人： Christopher McNulty , Peter B. Roemer , Robert Stevens , Yuan Cheng
发明人： Christopher McNulty , Peter B. Roemer , Robert Stevens , Yuan Cheng
IPC分类号： G01V3/00
CPC分类号： A61B5/055 , A61B5/0555 , A61B5/4528 , G01R33/30 , G01R33/307 , G01R33/3806
摘要： A system and method are presented that facilitate imaging of the joints of the upper and lower extremities including, for example, the hip and shoulder as well as sections of the spine, among others. One embodiment of the invention includes a short bore cylindrical magnet with an imaging volume smaller than that of a comparable whole body system, an articulated table that allows placement of the joint to be imaged in the center of the magnet homogeneous volume while maintaining a high degree of patient comfort and openness. The gradient and RF coils may be positioned above and below the patient instead of 360 degrees surrounding the patient. A smaller RF and gradient coil is made feasible because of the reduced imaging volume.
摘要翻译：提出了一种系统和方法，其促进上肢和下肢的关节的成像，包括例如臀部和肩部以及脊柱的部分等。本发明的一个实施例包括具有小于可比较的全身系统的成像体积的短孔圆柱形磁体，铰接台允许将要成像的关节放置在磁体均匀体积的中心，同时保持高度患者舒适和开放。梯度和RF线圈可以位于患者的上方和下方，而不是围绕患者的360度。由于成像体积的减小，较小的RF和梯度线圈是可行的。

26. 发明申请

US20100171500A1 DEDICATED SYSTEM FOR MSK JOINT IMAGING 有权
标题翻译：用于MSK联合成像的专用系统
公开(公告)号：US20100171500A1
公开(公告)日：2010-07-08
申请号：US12615385
申请日：2009-11-10
申请人： Christopher McNulty , Peter B. Roemer , Robert Stevens , Yuan Cheng
发明人： Christopher McNulty , Peter B. Roemer , Robert Stevens , Yuan Cheng
IPC分类号： G01R33/44 , G01R33/48
CPC分类号： A61B5/055 , A61B5/0555 , A61B5/4528 , G01R33/30 , G01R33/307 , G01R33/3806
摘要： A system and method are presented that facilitate imaging of the joints of the upper and lower extremities including, for example, the hip and shoulder as well as sections of the spine, among others. One embodiment of the invention includes a short bore cylindrical magnet with an imaging volume smaller than that of a comparable whole body system, an articulated table that allows placement of the joint to be imaged in the center of the magnet homogeneous volume while maintaining a high degree of patient comfort and openness. The gradient and RF coils may be positioned above and below the patient instead of 360 degrees surrounding the patient. A smaller RF and gradient coil is made feasible because of the reduced imaging volume.
摘要翻译：提出了一种系统和方法，其促进上肢和下肢的关节的成像，包括例如臀部和肩部以及脊柱的部分等。本发明的一个实施例包括具有比可比较的全身系统的成像体积小的成像体积的短孔圆柱形磁体，铰接台允许将要成像的关节放置在磁体均匀体积的中心，同时保持高度患者舒适和开放。梯度和RF线圈可以位于患者的上方和下方，而不是围绕患者的360度。由于成像体积的减小，较小的RF和梯度线圈是可行的。

27. 发明授权

US5545999A Preamplifier circuit for magnetic resonance system 失效
标题翻译：用于磁共振系统的前置放大器电路
公开(公告)号：US5545999A
公开(公告)日：1996-08-13
申请号：US407825
申请日：1995-03-21
申请人： Otward M. Mueller , Christopher P. Yakymyshyn , Peter B. Roemer , Ronald D. Watkins
发明人： Otward M. Mueller , Christopher P. Yakymyshyn , Peter B. Roemer , Ronald D. Watkins
IPC分类号： A61M25/095 , G01R33/36 , G01V3/00
CPC分类号： G01R33/3692 , G01R33/3621
摘要： A circuit for amplifying signals received by the receive coil of a magnetic resonance (MR) system includes a preamplifier employing an active circuit device, such as a GaAs-MESFET or HEMT. The preamplifier is located proximate to the receive coil in order to maintain as high a signal-to-noise ratio as possible for the preamplifier output signals. A capacitance is coupled to the receive coil to form an input impedance matching network for the input of the preamplifier. The preamplifier output is coupled through a fiber optic cable to remotely located MR signal processing electronics, which further processes signals received by the MR receive coil and amplified by the preamplifier.
摘要翻译：用于放大由磁共振（MR）系统的接收线圈接收的信号的电路包括采用诸如GaAs-MESFET或HEMT的有源电路器件的前置放大器。前置放大器位于接收线圈附近，以便为前置放大器输出信号保持尽可能高的信噪比。电容耦合到接收线圈以形成用于前置放大器的输入的输入阻抗匹配网络。前置放大器输出通过光纤电缆耦合到远程定位的MR信号处理电子设备，其进一步处理由MR接收线圈接收并由前置放大器放大的信号。

28. 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。

29. 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。

30. 发明授权

US5258710A Cryogenic probe for NMR microscopy 失效
标题翻译：用于NMR显微镜的低温探针
公开(公告)号：US5258710A
公开(公告)日：1993-11-02
申请号：US858924
申请日：1992-03-27
申请人： Robert D. Black , Peter B. Roemer , Antonio A. Mogro-Campero , Larry G. Turner
发明人： Robert D. Black , Peter B. Roemer , Antonio A. Mogro-Campero , Larry G. Turner
IPC分类号： F17C13/00 , G01R33/31 , G01R33/34 , G01R33/20
CPC分类号： G01R33/34053 , G01R33/31 , G01R33/34061 , G01R33/341 , G01R33/34007 , G01R33/34023 , G01R33/3403
摘要： An apparatus for microscopic imaging employing nuclear magnetic resonance is constructed from a cryogenic probe which is situated in a conventional magnetic resonance imaging system. The cryogenic probe employs a number of chambers and cryogenic liquids which cool a superconductor resonator to very low temperatures. A sample tube for containing a small specimen is heated to a temperature above its freezing point by flowing nitrogen gas over the specimen. A secondary resonant circuit is inductively coupled to the superconducting resonator. A transceiver passes RF signals to be transmitted into the specimen through the secondary resonant circuit causing the superconducting resonator to transmit the RF signal into the specimen. The resonator then acts as a receive coil and receives a signal from the specimen which is inductively passed to the secondary resonator circuit from which an image is generated. The use of superconductors having low resistance and low temperatures causes noise to be significantly reduced, and the signal-to-noise ratio to be substantially increased.
摘要翻译：使用核磁共振的微观成像装置由位于常规磁共振成像系统中的低温探针构成。低温探针采用多个室和低温液体，将超导体谐振器冷却到非常低的温度。用于容纳小样本的样品管通过将氮气流过样品而被加热到高于其凝固点的温度。次级谐振电路感应耦合到超导谐振器。收发器将RF信号通过次级谐振电路传输到样品中，使超导谐振器将RF信号传输到样品中。谐振器然后用作接收线圈并且接收来自样品的信号，其被感应地传递到从其产生图像的次级谐振器电路。使用具有低电阻和低温度的超导体使得噪声显着降低，并且信噪比将显着增加。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式