专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5438992A Flow-induced artifact elimination in magnetic resonance images 失效
标题翻译：磁共振图像中的流感神经消除
公开(公告)号：US5438992A
公开(公告)日：1995-08-08
申请号：US146393
申请日：1993-11-01
申请人： John M. Siegel, Jr. , David N. Ku , John N. Oshinski , Roderic I. Pettigrew
发明人： John M. Siegel, Jr. , David N. Ku , John N. Oshinski , Roderic I. Pettigrew
IPC分类号： G01R33/56 , G01R33/563 , A61B5/055
CPC分类号： G01R33/563 , G01R33/56
摘要： Magnetic resonance imaging of a blood vessel exhibits flow artifacts, or signal loss, around a constriction (26) due to turbulent fluid flow. Signal loss in a region (27) prior to the constricted region (26) is primarily caused by convective acceleration, and this signal loss is substantially eliminated by performing an acceleration compensation process. Signal loss in a region (32) situated after the constriction (26) is primarily caused by velocity fluctuations, and this signal loss is cured by an imaging process which does not rely on the phase of the electromagnetic excitation signal(s) for spatial localization. Examples of imaging processes for minimizing signal loss due to turbulence include a projection reconstruction process (34) and a two dimensional slice selection process (56). Further, the two dimensional slice selection process (56) may be used for generating instantaneous velocities of fluid flowing through a fluid channel. Also, if a number of instantaneous velocities are produced over a time period, then fluctuation velocities can be determined via time-resolved averaging.
摘要翻译：血管的磁共振成像由于湍流流动而在收缩（26）周围显示出流动假象或信号损失。在收缩区域（26）之前的区域（27）中的信号损失主要由对流加速度引起，并且通过执行加速度补偿处理基本上消除了该信号损失。位于收缩（26）之后的区域（32）中的信号损失主要是由速度波动引起的，并且该信号损失通过不依赖于用于空间定位的电磁激励信号的相位的成像过程来固化。用于使由湍流引起的信号损失最小化的成像处理的示例包括投影重建处理（34）和二维切片选择处理（56）。此外，二维切片选择过程（56）可用于产生流过流体通道的流体的瞬时速度。此外，如果在一段时间内产生多个瞬时速度，则可以通过时间分辨平均来确定波动速度。

2. 发明授权

US5521502A Flow differentiation scheme for magnetic resonance angiography 失效
标题翻译：磁共振血管造影的流动分化方案
公开(公告)号：US5521502A
公开(公告)日：1996-05-28
申请号：US232377
申请日：1994-04-25
申请人： John M. Siegel, Jr. , David N. Ku
发明人： John M. Siegel, Jr. , David N. Ku
IPC分类号： G01F1/704 , G01R33/561 , G01R33/563 , G01R33/48
CPC分类号： G01F1/704 , G01R33/563 , G01R33/5615
摘要： A flow differentiation scheme is disclosed for magnetic resonance imaging (MRI) of fluid flow in regions of turbulent flow. The flow differentiation scheme comprises the steps of (1) obtaining a first magnetic resonance (MR) image of the region, (2) obtaining a second MR image of the same region with an imaging parameter or imaging sequence altered, and (3) logically differentiating the first and second images with respect to flow to create a difference image. The process may be enhanced by superimposing one of the original images, upon an image that has been flow differentiated. As a result, a substantial amount of the static signal is suppressed producing superior angiograms of diseased and undiseased blood vessels. Additionally, the scheme can be used to image any fluid flow in any body or thing.
摘要翻译：公开了用于湍流区域中流体流动的磁共振成像（MRI）的流动分化方案。流动微分方案包括以下步骤：（1）获得该区域的第一磁共振（MR）图像，（2）用成像参数或成像序列改变获得相同区域的第二MR图像，以及（3）逻辑上相对于流动来区分第一和第二图像以产生差异图像。可以通过将原始图像中的一个重叠在已经被流分辨的图像上来增强该过程。结果，大量的静电信号被抑制，从而产生患病和未发病的血管的优异血管造影。此外，该方案可用于对任何身体或物体中的任何流体流进行成像。

3. 发明授权

US06409700B1 Double lumen catheter 有权
标题翻译：双腔导管
公开(公告)号：US06409700B1
公开(公告)日：2002-06-25
申请号：US09273571
申请日：1999-03-22
申请人： John M. Siegel, Jr. , Vinod B. Makhijani , Ming Lei , Jagannath Raghavan
发明人： John M. Siegel, Jr. , Vinod B. Makhijani , Ming Lei , Jagannath Raghavan
IPC分类号： A61M300
CPC分类号： A61M1/3653 , A61M1/3658 , A61M1/3659 , A61M1/3661 , A61M25/0021 , A61M25/003 , A61M2025/0031 , A61M2025/0037 , A61M2025/0073
摘要： Blood is withdrawn from a vein by a double lumen catheter that has an elongated tube with unitary outer walls. A longitudinal planar septum divides the interior of the tube into an inlet lumen and a longer return lumen. The inlet lumen extends from a proximal end of the tube to an end terminating in a distally forward facing aperture. The return lumen extends contiguously with the inlet lumen from the proximal end of the tube to an end terminating in a distally forward facing aperture spaced in the longitudinal direction distally forward of the inlet lumen aperture. A diverting structure extends from an outer wall of the return lumen distally forward of the aperture of the inlet lumen. The diverting structure diverts flow of treated fluid discharged from the return lumen away from the distally forward facing aperture of the inlet lumen. The blood withdrawn via the catheter is circulated for treatment in a blood purification system.
摘要翻译：血液通过具有整体外壁的细长管的双腔导管从静脉中取出。纵向平面隔膜将管的内部分成入口腔和更长的回流腔。入口腔从管的近端延伸到终止于向前的朝前的孔的端部。返回内腔与入口腔从管的近端连续延伸到终端于远端前进对面的端部的端部，其沿纵向方向向前远离入口腔孔的前方延伸。转向结构从返回腔的外壁延伸到入口腔的孔的远侧前方。转向结构将从返回腔排出的经处理流体的流动远离入口腔的远端向前的孔。通过导管取出的血液循环用于血液净化系统中的治疗。

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