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1. 发明授权

US06603990B2 Separation and identification of water and fat MR images at mid-field strength with reduced T2/T2* weighting 有权
公开(公告)号：US06603990B2
公开(公告)日：2003-08-05
申请号：US09925520
申请日：2001-08-10
申请人： Weiguo Zhang , David M. Kramer
发明人： Weiguo Zhang , David M. Kramer
IPC分类号： A61B5055
CPC分类号： G01R33/4828 , A61B5/055
摘要： A magnetic resonance imaging (MRI) method is disclosed for generating and identifying water and fat separated MR images. Image data is first acquired to obtain two echo images with the water and fat signals orthogonal in the first echo image, and parallel/anti-parallel in the second echo image. The effect of background field inhomogeneties are removed, and water and fat images are separated from each other. The separated water and fat images are identified according to the difference of their precessing frequencies.

2. 发明授权

US5652514A Correction for field variation in steady-state MRI by repeated acquisition of zero k-space line 失效
标题翻译：通过重复采集零k空间线来校正稳态MRI中的场变化
公开(公告)号：US5652514A
公开(公告)日：1997-07-29
申请号：US621240
申请日：1996-03-25
申请人： Weiguo Zhang , David M. Kramer , David M. Goldhaber
发明人： Weiguo Zhang , David M. Kramer , David M. Goldhaber
IPC分类号： G01R33/54 , A61B5/055 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56563
摘要： Methods and apparatus for correcting image artefacts caused by variations in the main magnetic field of an MRI system are disclosed, particularly for MRI with steady-state spin precession. For field correction in MRI with steady-state spin precession, the effects of the field changes can be corrected by quantifying the time course of the field drifts by repeated acquisition of the zero k-space lines. The change in the phase between consecutive zero k-space lines is used as an indicator of field variation and for correction of associated image artifacts. By using for field correction the zero k-space lines acquired using the imaging sequence itself, the steady-states of spin precession are undisturbed throughout the MRI data acquisition.
摘要翻译：公开了用于校正由MRI系统的主磁场的变化引起的图像伪像的方法和装置，特别是对于具有稳态旋转进动的MRI。对于具有稳态自旋进动的MRI中的场校正，可以通过重复采集零k空间线来量化场漂移的时间过程来校正场变化的影响。使用连续零k空间线之间的相位变化作为场变化的指示符和用于校正相关联的图像伪像。通过使用场校正，使用成像序列本身获取的零k空间线，自旋进动的稳态在整个MRI数据采集期间不受干扰。

3. 发明授权

US5277741A Sealing apparatus 失效
标题翻译：密封装置
公开(公告)号：US5277741A
公开(公告)日：1994-01-11
申请号：US926239
申请日：1992-08-06
申请人： David M. Kramer
发明人： David M. Kramer
IPC分类号： B31B1/84 , B65D77/22 , B65C9/36
CPC分类号： B65D77/225 , B31B2201/9085 , Y10T156/1707 , Y10T156/171
摘要： A sealing apparatus for applying seals, such as valves, over a pressure relief passage of a container. Displaceable retention members, positioned next to a platen having an applicator surface, releasably secure one or more seals adjacent the applicator surface prior to attachment to the container. A seal attachment element moves the applicator surface toward and into a seal attachment position adjacent the container. As the applicator surface moves, the displaceable retention members release to, in turn, effectuate attachment of the seals over the pressure relief passage. A retraction element operatively attached to the platen causes return movement of the applicator surface and, in turn, return of the displaceable retention members back into a seal retaining position.
摘要翻译：一种用于在容器的压力释放通道上施加诸如阀之类的密封件的密封装置。位于具有施用器表面的压板旁边的可移动保持构件在附接到容器之前可释放地固定邻近施用器表面的一个或多个密封件。密封附接元件将施加器表面朝向和邻近容器的密封件附接位置移动。当施加器表面移动时，可移动的保持构件释放，从而实现密封件在压力释放通道上的附接。可操作地附接到压盘的回缩元件引起涂抹器表面的返回运动，并且使可移动的保持构件返回到密封保持位置。

4. 发明授权

US5184074A Real-time MR imaging inside gantry room 失效
标题翻译：实时成像内部的GANTRY室
公开(公告)号：US5184074A
公开(公告)日：1993-02-02
申请号：US650215
申请日：1991-02-04
申请人： Mitsuaki Arakawa , Christine Hawryszko , Leon Kaufman , David M. Kramer , Barry McCarten
发明人： Mitsuaki Arakawa , Christine Hawryszko , Leon Kaufman , David M. Kramer , Barry McCarten
IPC分类号： A61B5/055 , G01R33/28 , G01R33/38
CPC分类号： G01R33/283 , G01R33/3806
摘要： Continuously updated real-time magnetic resonance imaging processes are used to display an MR image volume to an operator and/or patient co-located with the MRI magnet, viewing console and other elements of an MRI system within the same shielded gantry room. A CRT display may be used for lower field MRI systems while liquid crystal displays may be necessary for higher field MRI systems since the viewing console is to be co-located within the shielded gantry room near the MRI magnet assembly. Suitable RF shielding is provided to RF-isolate the viewing console and its related power and video signal cables from the MRI RF coils being used to monitor relatively weak NMR signals emanating from the image volume within the magnet assembly. When used with open access MRI magnet assemblies, such real-time viewing of the image volume within the gantry room permits performance of simultaneous patient procedures guided by real-time visual feedback to the patient and/or doctor, nurse, patient attendant and the like while located within the gantry room and having direct access to the patient anatomy within the image volume.

5. 发明授权

US5155435A Method and apparatus for performing interventional medical procedures using MR imaging of interventional device superimposed with ghost patient image 失效
标题翻译：使用叠加有鬼影像的介入装置的MR成像进行介入医学程序的方法和装置
公开(公告)号：US5155435A
公开(公告)日：1992-10-13
申请号：US741943
申请日：1991-08-08
申请人： Leon Kaufman , David M. Kramer , Christine Hawryszko
发明人： Leon Kaufman , David M. Kramer , Christine Hawryszko
IPC分类号： A61B5/055 , A61B17/00 , A61B19/00 , G01R33/28 , G01R33/48
CPC分类号： G01R33/28 , A61B90/36 , A61B2090/374 , A61B34/10 , A61B90/10
摘要： Positioning of interventional devices within the patient image volume of an MRI system is performed while viewing real-time fluoroscopic MR images of such devices superimposed upon a saved prior image ("ghost") of patient anatomy that was earlier located within the same image volume. After such interventional medical procedure is thoroughly planned using the earlier acquired three-dimensional ghost image, the patient anatomy is relocated within the image volume and the final selected trajectory for the interventional device or medical procedure is then performed (preferably while real time MRI fluoroscopy is used to monitor the actual interventional procedure within the real patient anatomy).
摘要翻译：介入装置在MRI系统的患者图像体积内的定位被执行，同时观察叠加在先前位于相同图像体积内的患者解剖结构的保存的先前图像（“鬼”）的这种装置的实时透视MR图像。在使用早期获取的三维重影图像彻底规划这种介入医疗程序之后，将患者解剖结构重新定位在图像体积内，然后执行用于介入装置或医疗程序的最终所选择的轨迹（优选地，在实时MRI荧光透视术是用于监测真实患者解剖学中的实际介入程序）。

6. 发明授权

US4695800A Non harmonic NMR spin echo imaging 失效
标题翻译：非谐波自旋回波成像
公开(公告)号：US4695800A
公开(公告)日：1987-09-22
申请号：US742161
申请日：1985-06-06
申请人： David M. Kramer , Russell A. Compton , Lawrence M. Strenk , James B. Murdoch
发明人： David M. Kramer , Russell A. Compton , Lawrence M. Strenk , James B. Murdoch
IPC分类号： G01R33/44 , A61B5/055 , A61B10/00 , G01R33/48 , G01R33/54 , G01R33/565 , H04N5/30 , G01R33/20
CPC分类号： G01R33/482 , G01R33/56554
摘要： A technique for producing multiple spin echo signals following an initial excitation pulse is provided. A first inverting pulse is applied a given time interval following the initial excitation pulse, resulting in the formation of the usual first spin echo signal after passage of the given time interval. At a later point in time, a second inverting pulse is applied. The time interval between the initial excitation pulse and this second inverting pulse is not required to be harmonically related to the first given time interval. This results in the production of at least a second, later occurring spin echo signal which does not contain harmonically-related artifact components of the earlier pulses and spin echo signals.
摘要翻译：提供了一种在初始激励脉冲之后产生多个自旋回波信号的技术。在初始激励脉冲之后的给定时间间隔施加第一反相脉冲，导致在给定时间间隔之后形成通常的第一自旋回波信号。在稍后的时间点，施加第二反相脉冲。初始激励脉冲与第二反相脉冲之间的时间间隔不需要与第一给定时间间隔谐波相关。这导致产生不包含较早脉冲和自旋回波信号的谐波相关伪像分量的至少第二个稍后发生的自旋回波信号。

7. 发明授权

US4616182A Nuclear magnetic resonance signal artifact removal 失效
标题翻译：核磁共振信号伪影去除
公开(公告)号：US4616182A
公开(公告)日：1986-10-07
申请号：US550522
申请日：1983-11-09
申请人： David M. Kramer , Hong-Ning Yeung
发明人： David M. Kramer , Hong-Ning Yeung
IPC分类号： G01R33/565 , G01R33/20
CPC分类号： G01R33/565
摘要： In an NMR imaging system, two-pulse excitation sequences are used to acquire lines of NMR signal information. Artifact signal components may also be present during the times of NMR signal acquisition. In order to remove these artifacts from the center of the image, the artifact signals are alternately phase-encoded from line to line by alternating the phase of one of said excitation pulses from line to line. Fourier transformation is performed on the lines of information in at least the direction of alternate phasing of the artifact components, which relocates the artifacts to the edge of the resulting image.
摘要翻译：在NMR成像系统中，使用双脉冲激励序列来获取核磁共振信号信息。在NMR信号采集期间，人造物信号分量也可能存在。为了从图像的中心去除这些伪像，通过将一个所述激励脉冲的相位从一行到另一行交替地将伪像信号从一行到另一个交替地相位编码。至少在伪像分量的交替定相的方向上对信息线执行傅立叶变换，其将伪像重新定位到所得图像的边缘。

8. 发明授权

US5928546A Electrical resistance cooker and automatic circuit controller 失效
标题翻译：电阻电磁炉和自动电路控制器
公开(公告)号：US5928546A
公开(公告)日：1999-07-27
申请号：US920655
申请日：1997-08-29
申请人： David M. Kramer , Maurice W. Lee, Jr. , Ivanhoe E. Chaput , Maurice W. Lee, III
发明人： David M. Kramer , Maurice W. Lee, Jr. , Ivanhoe E. Chaput , Maurice W. Lee, III
IPC分类号： A47J37/06 , H05B3/00 , H05B1/02
CPC分类号： H05B3/0023 , A47J37/0611
摘要： An automatic circuit controller for cooking food interposed between electrodes connected with a source of AC by electrical resistance in which the resistance increases until the food is cooked and rapidly declines is formed by a current switching element in series in one wire of the AC source and a current sensing element in series in another wire of the AC source. The sensed current is rectified, reduced in voltage, converted from analog to digital and applied to a microprocessor connected with the switching element for controlling the current applied to the food by delaying the time into every half cycle in response to current measuring circuitry and a zero crossing detector for triggering the switching element on. The microprocessor detects the current peak of electrical resistance of the food and stops the cooking action when the current declines to a predetermined percent of the peak.
摘要翻译：一种用于烹饪食物的自动电路控制器，其通过电阻连接到电极之间的电极进行烹饪，所述电阻通过电阻增加直到食物被烹饪并迅速下降，由AC电源的一根线中的电流开关元件形成，并且电流感测元件串联在交流电源的另一根线中。感测到的电流被整流，电压降低，从模拟转换成数字，并且应用于与开关元件连接的微处理器，用于通过将时间延迟到每半个周期以响应于当前测量电路而控制施加到食物的电流，零用于触发开关元件的交叉检测器。当电流下降到峰值的预定百分比时，微处理器检测食物的电阻的当前峰值并停止烹饪动作。

9. 发明授权

US5838430A Dual beam laser device for linear and planar alignment 失效
公开(公告)号：US5838430A
公开(公告)日：1998-11-17
申请号：US675655
申请日：1996-07-03
申请人： Dan Slater , David M. Kramer
发明人： Dan Slater , David M. Kramer
IPC分类号： G01B11/26 , G01B11/27 , G01C15/00
CPC分类号： G01B11/26 , G01B11/27 , G01C15/004
摘要： A high precision alignment apparatus is provided that utilizes a semiconductor laser device, such as a laser diode, to provide a source laser beam. The alignment apparatus permits the division of a pair of beam components from the source laser beam useful for either linear or planar alignment. A centroid measurement between the beam components provides a corrected reference point that accounts for the inherent instability of the source laser beam to yield a high level of alignment accuracy. For linear alignment purposes, the beam components are collinearly directed. In the alternative, for planar alignment purposes, the beam components may be either collinear or directed in opposite directions, and rotated to sweep respective planar regions. The laser alignment apparatus is capable of providing a level of accuracy heretofore achievable only with gas lasers, while maintaining the economical attributes of commercial semiconductor laser diodes.

10. 发明授权

US4899045A Multiple channel fiber optic continuity test system 失效
标题翻译：多通道光纤连续性测试系统
公开(公告)号：US4899045A
公开(公告)日：1990-02-06
申请号：US197931
申请日：1988-05-24
申请人： David M. Kramer
发明人： David M. Kramer
IPC分类号： G01M11/00
CPC分类号： G01M11/31
摘要： An optical system for individually testing each one of a plurality of fibers for continuity. Each fiber having a proximal end and a distal end with a dichroic reflector at each distal end reflective of wavelengths respective to a source of testing light and transmissive to other wavelengths. The selection of which fiber is to be tested is only a matter of manipulating a rotator element which has the capacity to rotate the angle of polarization by 90 degrees. The polarization of the light determines the respective fiber to be tested.
摘要翻译：一种用于单独测试多个光纤中的每一个以获得连续性的光学系统。每个光纤具有近端和远端，每个远端具有二向色反射器，反射出与测试光源相对应的波长，并且可透射到其它波长。要测试哪种纤维的选择只是操纵具有将偏振角旋转90度的能力的旋转元件的问题。光的偏振决定了要测试的各个光纤。

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