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1. 发明授权

US5066914A Gradient amplifier system with flexible amplifier allocation 失效
标题翻译：具有灵活放大器分配的梯形放大器系统
公开(公告)号：US5066914A
公开(公告)日：1991-11-19
申请号：US498731
申请日：1990-03-26
申请人： Robert M. Vavrek , Thomas G. McFarland
发明人： Robert M. Vavrek , Thomas G. McFarland
IPC分类号： A61B5/055 , G01R33/12 , G01R33/381 , G01R33/385 , G01R33/48 , H03F3/217 , H03F3/68
CPC分类号： H03F3/2178 , G01R33/3852 , H03F2200/261
摘要： A magnetic resonance imaging system uses a pool of amplifiers to generate gradient signals. Each amplifier within the pool may be switched among any of the gradient axes, so as to efficiently allocate amplifier power among the gradients. In one embodiment, the amplifiers of the pools are connected in stacks by an input and output matrix comprised of mechanical switches driven in tandem by interlocked motors. The switches connect the outputs of the amplifiers in series. The input signal is "boot strapped" through the amplifier stack to provide proper signal level.

2. 发明授权

US06965235B1 Apparatus to simulate MR properties of human brain for MR applications evaluation 失效
标题翻译：用于模拟人脑的MR性质用于MR应用评估的装置
公开(公告)号：US06965235B1
公开(公告)日：2005-11-15
申请号：US10604481
申请日：2003-07-24
申请人： Ceylan C. Guclu , Timothy W. Skloss , Robert M. Vavrek , Ricardo Becerra
发明人： Ceylan C. Guclu , Timothy W. Skloss , Robert M. Vavrek , Ricardo Becerra
IPC分类号： G01R33/58 , G01V3/00
CPC分类号： G01R33/58
摘要： A system and method for mimicking a human brain for MR imaging at various magnetic field strengths is disclosed. A phantom is constructed of a structure having a number of sections. A first section contains a mixture of nickel chloride, agarose gel powder, potassium sorbate, deuterium oxide, and water such that the T1, T2, and proton density values of the first section mimic white matter of the human brain. A second section contains different amounts of the same components such that the T1, T2, and proton density values of the second section mimic gray matter of the human brain. As such, when the phantom is scanned in an MR imaging machine, an optimized flip angle for T1-weighted imaging to improve contrast between white matter and gray matter of the human brain that takes into account proton density differences therebetween can be determined.
摘要翻译：公开了用于在各种磁场强度下模拟人脑用于MR成像的系统和方法。体模由具有多个部分的结构构成。第一部分包含氯化镍，琼脂糖凝胶粉末，山梨酸钾，氧化氘和水的混合物，使得第一部分的T1，T2和质子密度值模拟人脑的白质。第二部分包含不同量的相同组分，使得第二部分的T1，T2和质子密度值模拟人脑的灰质。因此，当在MR成像机中扫描幻影时，可以确定考虑到其之间的质子密度差异的用于T1加权成像以改善人脑的白质和灰质之间的对比度的优化翻转角。

3. 发明授权

US4646046A Shielded room construction for containment of fringe magnetic fields 失效
标题翻译：屏蔽室结构用于容纳边缘磁场
公开(公告)号：US4646046A
公开(公告)日：1987-02-24
申请号：US673692
申请日：1984-11-21
申请人： Robert M. Vavrek , Nancy S. Grigsby
发明人： Robert M. Vavrek , Nancy S. Grigsby
IPC分类号： A61B5/055 , A61B10/00 , G01R33/421 , G12B17/02 , H01F7/20 , H01F7/00
CPC分类号： G12B17/02
摘要： A shielded room for containment of magnetic fringe fields generated by a magnet which forms part of an NMR scanner system utilizes wall members having a thickness proportional to the amount of flux conducted. In the preferred embodiments, the shielded room can have one of rectangular, cylindrical, or polygonal geometries, for example. The walls (floors and ceilings) are constructed from staggered plates to have increased thickness where flux is greatest, and correspondingly decreased thickness where the flux is lowest. The shielded room can be, additionally, provided with end-cap elements in the walls perpendicular to the base of the magnet. Preferentially, the end-cap elements are angled away from the side wall members toward the center of the room to more closely follow the flux path.
摘要翻译：用于容纳由形成NMR扫描器系统的一部分的磁体产生的磁性边缘场的屏蔽室利用具有与传导通量的量成比例的厚度的壁构件。在优选实施例中，屏蔽室可以具有例如矩形，圆柱形或多边形几何形状之一。墙壁（地板和天花板）由交错板构成，其中通量最大的厚度增加，并且通量最低的厚度相应减小。屏蔽室还可以在垂直于磁体底部的壁中设置端帽元件。优选地，端盖元件远离侧壁构件朝向房间的中心成一角度，以更紧密地跟随通量路径。

4. 发明授权

US06933721B2 Method and apparatus for enhanced fat saturation during MRI 失效
标题翻译： MRI中增强脂肪饱和度的方法和装置
公开(公告)号：US06933721B2
公开(公告)日：2005-08-23
申请号：US10738692
申请日：2003-12-17
申请人： Robert M. Vavrek , Ricardo Becerra , Ceylan C. Guclu
发明人： Robert M. Vavrek , Ricardo Becerra , Ceylan C. Guclu
IPC分类号： G01R33/387 , G01V3/00
CPC分类号： G01R33/387
摘要： The present invention provides for a method for using a silicon dioxide (SiO2) material that is equally effective in improving magnetic field homogeneity during MR imaging. The present invention further provides for using silicon dioxide in its granular state. The granular silicon dioxide can then be poured inside a flexible container and the flexible container can be formed to fit any contour of the body.
摘要翻译：本发明提供了一种在MR成像期间同样有效地提高磁场均匀性的二氧化硅（SiO 2）2材料的使用方法。本发明还提供了使用其颗粒状态的二氧化硅。然后将颗粒状二氧化硅倒入柔性容器内，并且柔性容器可以形成为适合身体的任何轮廓。

5. 发明授权

US5304933A Surgical local gradient coil 失效
标题翻译：手术局部梯度线圈
公开(公告)号：US5304933A
公开(公告)日：1994-04-19
申请号：US738970
申请日：1991-08-01
申请人： Robert M. Vavrek , Christopher C. Myers
发明人： Robert M. Vavrek , Christopher C. Myers
IPC分类号： G01R33/28 , G01R33/34 , G01R33/385 , G01R33/20
CPC分类号： G01R33/34046 , G01R33/385 , G01R33/285
摘要： A local gradient coil adapted for use with stereotaxic devices includes an opening in the coil form positioned to minimize the disruption to the gradient fields and a bearing for moving the form with respect to the stereotaxic frame so that the opening may be limited in area and yet provide essentially unrestricted access to the patient. The windings in the neighborhood of the opening may be diverted by modifying the stream function of the windings in a manner to minimize the effect of the opening on the gradient field.
摘要翻译：适于与立体定位装置一起使用的局部梯度线圈包括线圈形式的开口，定位成使对梯度场的破坏最小化，以及用于相对于立体定位框架移动形状的轴承，使得开口可以局限于区域提供基本上无限制地访问患者。开口附近的绕组可以通过以使开口对梯度场的影响最小化的方式修改绕组的流功能来转向。

6. 发明授权

US5270657A Split gradient amplifier for an MRI system 失效
标题翻译：用于MRI系统的分离梯度放大器
公开(公告)号：US5270657A
公开(公告)日：1993-12-14
申请号：US965131
申请日：1992-10-22
申请人： William F. Wirth , Thomas G. McFarland , Robert M. Vavrek , Peter B. Roemer , Otward M. Mueller , John N. Park
发明人： William F. Wirth , Thomas G. McFarland , Robert M. Vavrek , Peter B. Roemer , Otward M. Mueller , John N. Park
IPC分类号： G01R33/385 , G01V3/00
CPC分类号： G01R33/3852
摘要： A gradient amplifier for use in magnetic resonance imaging equipment employs a low voltage DC power supply connected in series between a pair of higher voltage DC power supplies, the latter supplies serving to provide increased power for rapid gradient switching and the former supply providing correction current to produce the desired voltage output. The high voltage DC power supplies preferably comprise multiple DC units which can be combined to provide finer steps of control prior to correction by the lower voltage supply. The low voltage DC power supply preferably comprise one or more linear amplifiers connected in series, or one or more switchmode amplifiers connected in series. The DC power supplies are controlled in an open loop manner from a gradient signal that designates the desired current for the gradient coil and the amplifiers are operated in a closed loop responding to to a feedback signal from the gradient coil.
摘要翻译：用于磁共振成像设备的梯度放大器采用串联连接在一对高压直流电源之间的低压直流电源，后者用于为快速梯度切换提供增加的功率，而前一个电源提供校正电流产生所需的电压输出。高压DC电源优选地包括多个DC单元，其可以组合以在由较低电压源进行校正之前提供更精细的控制步骤。低压DC电源优选地包括串联连接的一个或多个线性放大器或串联连接的一个或多个开关模式放大器。直流电源由开路环路控制，该梯度信号指定用于梯度线圈的期望电流，并且放大器响应于来自梯度线圈的反馈信号在闭环中工作。

7. 发明授权

US4496841A Radiation detector with resonant frequency translator 失效
标题翻译：具有谐振频率转换器的辐射检测器
公开(公告)号：US4496841A
公开(公告)日：1985-01-29
申请号：US481420
申请日：1983-04-01
申请人： Dennis H. Pritzkow , Robert M. Vavrek
发明人： Dennis H. Pritzkow , Robert M. Vavrek
IPC分类号： G01T1/185 , H01J47/02 , G03B41/16
CPC分类号： H01J47/02
摘要： The radiation detector employs a rigid stiffener plate fastened to the detector housing to translate the housing resonant frequency outside the band of frequencies associated with the detector signals containing imaging information. In this manner, microphonic noise induced by the resonating housing does not interfere with the desired signals and does not degrade image quality.
摘要翻译：放射线检测器使用紧固到检测器壳体的刚性加强板，以将壳体谐振频率平移到与包含成像信息的检测器信号相关联的频率带之外。以这种方式，由谐振壳体引起的麦克风噪声不会干扰所需的信号，并且不会降低图像质量。

8. 发明授权

US4293770A X-Ray table for obtaining longitudinal and lateral oblique cardiovascular views 失效
标题翻译：用于获得纵向和横向倾斜心血管视图的X射线表
公开(公告)号：US4293770A
公开(公告)日：1981-10-06
申请号：US99132
申请日：1979-11-29
申请人： Robert M. Vavrek
发明人： Robert M. Vavrek
IPC分类号： A61B6/00 , A61B6/02 , G01N21/00
CPC分类号： A61B6/02 , A61B6/4028
摘要： An x-ray image intensifier is mounted over a patient supporting table for moving horizontally, vertically and for tilting about a laterally extending axis to obtain x-ray views on both sides of vertical. An x-ray tube casing is mounted on a base member in a housing below the table for tilting in angular synchronism with the intensifier. The base member is on a vertically movable platform and is rotatable about a vertical axis to enable positioning the focal spot of an x-ray tube in the casing for making oblique as well as longitudinal x-ray views of the heart of a patient on the table.
摘要翻译： X射线图像增强器安装在患者支撑台上，用于水平，垂直移动并且用于围绕横向延伸的轴线倾斜以获得垂直两侧的X射线视图。 X射线管壳体安装在桌子下方的基座构件上，用于与增压器倾斜角度同步。基座构件位于可垂直移动的平台上并且能够围绕垂直轴线旋转，以便将x射线管的焦点定位在壳体中，用于在患者的心脏上进行倾斜以及纵向X射线视图表。

9. 发明授权

US07171254B2 RF coil embedded with homogeneity enhancing material 有权
标题翻译： RF线圈嵌入均匀性增强材料
公开(公告)号：US07171254B2
公开(公告)日：2007-01-30
申请号：US10249208
申请日：2003-03-21
申请人： Robert M. Vavrek , Ceylan C. Guclu , Phillip E. Steen
发明人： Robert M. Vavrek , Ceylan C. Guclu , Phillip E. Steen
IPC分类号： A61B5/05
CPC分类号： G01R33/3415 , G01R33/341 , G01R33/5659
摘要： The present invention provides a system and method of improved homogeneity whereby at least a portion of an RF coil is filled with homogeneity enhancing material. Disposing the homogeneity enhancing material, such as perfluorocarbon, within the RF coil, implementation of thick saturation pads may be avoided altogether or thinner pads may be used to fill any voids between the patient and the coil. The present invention is particularly useful in a CTL coil assembly for acquiring diagnostic data of the neck region of a patient. However, the advantages achieved by the present invention may be incorporated into other surface coils for other anatomical regions where control of the susceptibility is desired. Additionally, the homogeneity enhancing material also acts as a heat sink for any hot spots on the coil.
摘要翻译：本发明提供了改进的均匀性的系统和方法，由此至少一部分RF线圈被均匀性增强材料填充。将均匀性增强材料（例如全氟化碳）置于RF线圈内，可以完全避免实施厚饱和焊盘，或者可以使用较薄的焊盘来填充患者和线圈之间的任何空隙。本发明在用于获取患者颈部区域的诊断数据的CTL线圈组件中特别有用。然而，本发明实现的优点可以并入其它表面线圈，用于需要敏感性控制的其它解剖区域。此外，均匀性增强材料还用作线圈上任何热点的散热器。

10. 发明授权

US5311135A Multiple tap gradient field coil for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的多抽头梯度场线圈
公开(公告)号：US5311135A
公开(公告)日：1994-05-10
申请号：US988986
申请日：1992-12-11
申请人： Robert M. Vavrek , Christopher C. Myers
发明人： Robert M. Vavrek , Christopher C. Myers
IPC分类号： G01R33/385 , G01V3/00
CPC分类号： G01R33/385
摘要： An NMR imaging system includes an apparatus for producing a magnetic field gradient within an imaging volume into which the object being imaged is placed. The relatively linear region of the magnetic field gradient is adjusted depending upon the size of the object. The apparatus comprises a source of a gradient signal and four saddle coils positioned in quadrant of a sheet that is wrapped around a cylindrical form. Each saddle coil has a spiral shaped conductive pattern on which are located a primary termination point and a pair of secondary termination points. A switch mechanism connects the four saddle coils in series with the source of a gradient signal, so that voltage from the gradient signal is applied between the primary termination point and a selected secondary termination point of each saddle coil. A control signal applied to the switch mechanism indicates selected secondary termination point and the signal varies according to the size of the object.
摘要翻译： NMR成像系统包括用于在成像体内产生磁场梯度的装置，成像对象被放置在该成像体内。根据物体的尺寸来调节磁场梯度的相对线性区域。该装置包括梯度信号源和位于围绕圆柱形的纸张的四分之一中的四个鞍形线圈。每个鞍形线圈具有螺旋形导电图案，其上定位有主终端点和一对次终端点。开关机构将四个鞍形线圈与梯度信号源串联连接，使得来自梯度信号的电压施加在主终端点和每个鞍形线圈的选定次级终端点之间。施加到开关机构的控制信号指示所选择的次要终止点，并且信号根据对象的大小而变化。

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