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41. 发明授权

US5898306A Single circuit ladder resonator quadrature surface RF coil 失效
标题翻译：单电路梯形谐振器正交表面RF线圈
公开(公告)号：US5898306A
公开(公告)日：1999-04-27
申请号：US838604
申请日：1997-04-09
申请人： Haiying Liu , Charles L. Truwit
发明人： Haiying Liu , Charles L. Truwit
IPC分类号： G01R33/341 , G01V3/00
CPC分类号： G01R33/3678
摘要： A single-circuit quadrature surface coil is formed from two ladder resonator coils and includes a first mode circuit path for detecting or generating magnetic flux in a vertical axis from a body under investigation and a second mode circuit path for detecting or generating magnetic flux in a parallel axis, with the first mode and second mode currents 90 degrees out of phase. The surface coil, which supports two resonance current modes for quadrature operation on only one single coil conductor structure, provides a high signal-to-noise ratio (SNR) and a good B.sub.1 homogeneity over the imaging volume. This coil alone may be used either for both transmitting and receiving RF signals or for detecting RF signals as "receive only." This coil is well suited for imaging the human neck, spine and heart.
摘要翻译：单电路正交表面线圈由两个梯形谐振器线圈形成，并且包括用于检测或产生来自所研究的物体的垂直轴中的磁通量的第一模式电路路径和用于检测或产生磁通量的第二模式电路路径平行轴，第一模式和第二模式电流相差90度。支持两个谐振电流模式的表面线圈仅在一个单个线圈导体结构上进行正交操作，在成像体积上提供了高信噪比（SNR）和良好的B1均匀性。单独的线圈既可以用于发送和接收RF信号，也可以用于将RF信号检测为“仅接收”。该线圈非常适合人类颈部，脊柱和心脏的成像。

42. 发明授权

US5833609A Rotating diffusion MR imaging reduced motion artifacts 失效
标题翻译：旋转扩散MR成像减少运动伪像
公开(公告)号：US5833609A
公开(公告)日：1998-11-10
申请号：US753543
申请日：1996-11-26
申请人： Wayne R. Dannels , Yansun Xu , Haiying Liu
发明人： Wayne R. Dannels , Yansun Xu , Haiying Liu
IPC分类号： G01R33/48 , A61B5/055 , G01R33/563
CPC分类号： G01R33/56341
摘要： Within a selected slice or slab, diffusion sensitizing gradients (54, 56) and read gradients (66, 68) are induced along each of a pair of orthogonal axes (G.sub.x, G.sub.y). The motion sensitizing gradient pulses sensitize excited magnetic resonance to diffusion in a preselected diffusion direction (D) which is orthogonal to a selected read gradient direction. The diffusion sensitizing gradients are rotated by sin(.theta.+.pi./2) and cos(.theta.+.pi./2) and the read gradients are rotated by sin.theta. and cos.theta. to generate a plurality of angularly displaced data lines. The diffusion sensitivity direction remains perpendicular to the read direction in each of the angularly displaced data lines. The phase of each data line is determined (90) and shifted (94) to compensate for linear translations. The data values within each data line are shifted (86) to center the peak amplitude of the data line at a preselected position to compensate for higher order motion. The set of angularly incremented data lines are reconstructed (96) into an image representation (98). In one embodiment, a plurality of the images are generated, each from data lines with their peak value shifted to a location which is offset by a fraction of a sample relative to the data lines which constructed the other images. Corresponding patches of these corresponding images are examined (110) for phase. Based on the examination, the one of the corresponding patches with the best image quality is transferred to a final image memory (114). In this manner, the final image is made up of the best patches of a plurality of corresponding images.
摘要翻译：在选定的切片或板内，沿着一对正交轴（Gx，Gy）中的每一个感应扩散敏化梯度（54,56）和读取梯度（66,68）。运动敏化梯度脉冲使激发的磁共振在与选定的读梯度方向正交的预选扩散方向（D）上扩散。扩散敏化梯度通过sin（θ+ pi / 2）和cos（θ+ pi / 2）旋转，并且读取的梯度被sinθ和cosθθ旋转以产生多个有角位移的数据线。扩散灵敏度方向在每个角位移数据线中保持垂直于读取方向。每个数据线的相位被确定（90）和偏移（94）以补偿线性平移。每个数据线内的数据值被移位（86）以将数据线的峰值振幅置于预选位置以补偿较高阶运动。将角度递增的数据线的集合（96）重建为图像表示（98）。在一个实施例中，生成多个图像，每个图像的数据线的峰值偏移到相对于构成其他图像的数据线的样本的一部分偏移的位置。检查（110）相应的相应图像的相应块。基于检查，具有最佳图像质量的相应补丁中的一个被传送到最终图像存储器（114）。以这种方式，最终图像由多个对应图像的最佳补丁组成。

43. 发明授权

US5652513A Phase sensitive magnetic resonance technique with integrated gradient profile and continuous tunable flow 失效
标题翻译：具有积分梯度曲线和连续可调流量的相敏磁共振技术
公开(公告)号：US5652513A
公开(公告)日：1997-07-29
申请号：US690850
申请日：1996-08-01
申请人： Haiying Liu , Paul M. Margosian , Yansun Xu
发明人： Haiying Liu , Paul M. Margosian , Yansun Xu
IPC分类号： G01R33/48 , A61B5/055 , G01R33/563 , G01V3/00
CPC分类号： G01R33/563
摘要： When a magnetic resonance imaging sequence is retrieved from memory (58), one of the slice select, phase-encode to read gradient profiles are retrieved for one of the slice select, phase-encode, read gradients. The two gradient profiles have a common field of view if a read gradient or slice thickness if a slice select gradient, but have different motion sensitizations. The reference gradient profile G.sub.1 stored in a memory (52) and the motion sensitized gradient profile G.sub.2 stored in a memory (56) are weighted (60, 62) by weighting functions .alpha..sub.1, .alpha..sub.2 which are selected in accordance with the selected motion sensitivity and a selected one of the field of view or slice thickness. The weighted profiles are combined (64) to generate a motion sensitized gradient with the selected motion sensitivity, field of view or slice thickness. The combined weighted gradient profile and the reference gradient profile are used in imaging sequences to generate reference and motion sensitized data lines (82, 84) which are reconstructed (86) into a reference image representation and a motion sensitized image representation. A moving tissue only image representation can be obtained (88) as well.
摘要翻译：当从存储器（58）检索磁共振成像序列时，检索片选，相位编码，读梯度中的一个片选，相位编码读取梯度分布。如果读取梯度或切片厚度，如果切片选择梯度，但具有不同的运动敏感度，则两个梯度轮廓具有公共视场。存储在存储器（52）中的参考梯度曲线G1和存储在存储器（56）中的运动敏化梯度轮廓G2通过根据所选运动选择的加权函数α1，α2加权（60,62）灵敏度和选择的视野或切片厚度之一。加权轮廓被组合（64）以产生具有选择的运动灵敏度，视场或切片厚度的运动敏化梯度。组合的加权梯度分布和参考梯度分布用于成像序列以产生被重建（86）成参考图像表示和运动敏化图像表示的参考和运动敏化数据线（82,84）。也可以获得移动的仅组织图像表示（88）。

44. 发明授权

US5602479A Quadrature radio frequency coil for magnetic resonance imaging 失效
标题翻译：用于磁共振成像的正交射频线圈
公开(公告)号：US5602479A
公开(公告)日：1997-02-11
申请号：US512388
申请日：1995-08-08
申请人： Ravi Srinivasan , Haiying Liu , Robert A. Elek
发明人： Ravi Srinivasan , Haiying Liu , Robert A. Elek
IPC分类号： A61B5/055 , G01R33/34 , G01R33/20
CPC分类号： G01R33/34046
摘要： In a magnetic resonance imaging apparatus, a radio frequency coil (40) is disposed closely adjacent the patient's head. The radio frequency coil includes a first annular ring (80, 114) around the patient's head from which a first plurality of legs (82, 116) extend. Opposite legs are interconnected equidistant from the first annular ring to form a virtual ground connection (84, 118). In the embodiment of FIG. 6, a second annular ring (120) is disposed parallel to the first annular ring with a second plurality of legs (122) extending between the first and second annular rings. By adjusting a ratio .rho. of the current flow in the loops defined by the first legs, the first annular ring and virtual ground relative to the current loops defined by the second legs and the first and second annular rings, the linearity of the B.sub.1 field within the head coil is selectively adjustable (FIG. 8).
摘要翻译：在磁共振成像装置中，射频线圈（40）紧邻患者头部设置。射频线圈包括围绕患者头部的第一环形环（80,114），第一多个腿部（82,116）从该第一环形环延伸。相对的腿与第一环形环等距离地形成虚拟接地连接（84,118）。在图1的实施例中如图6所示，第二环形圈（120）平行于第一环形环设置有在第一和第二环形环之间延伸的第二多个支柱（122）。通过调节由第一腿，第一环形圈和虚拟地线相对于由第二腿部和第一和第二环形圈限定的电流回路限定的环路中的电流的比率rho，其中B1场的线性度磁头线圈可选择性地调节（图8）。

45. 发明授权

US5594336A Three point technique using spin and gradient echoes for water/fat separation 失效
标题翻译：三点技术使用旋转和梯度回波进行水/脂肪分离
公开(公告)号：US5594336A
公开(公告)日：1997-01-14
申请号：US459051
申请日：1995-06-02
申请人： Rao P. Gullapalli , Haiying Liu , Mark J. Loncar
发明人： Rao P. Gullapalli , Haiying Liu , Mark J. Loncar
IPC分类号： G01R33/48 , A61B5/055 , G01R33/54
CPC分类号： G01R33/4828
摘要： Magnetic resonance is excited (50) in first and second species dipoles of a subject in a temporally constant magnetic field. The resonance is refocused (52) to generate a spin echo (54) centered at a time when the first and second species resonance signals are in-phase. Gradients echoes (64, 68) are generated, centered at a time (2n+1).pi./.delta..omega. before and after the spin echo, where .delta..omega. is a difference between the first and second species resonance frequencies. In this manner, the first and second species signals are 180.degree. out-of-phase in the gradient echoes. The resonance is refocused (82) one or more times to generate additional spin and gradient echoes with different phase encodings (78). The sequence is repeated with yet more phase encodings, and magnetic resonance signals from the spin echo and the two gradient echoes are reconstructed (86) into a spin echo image (s.sub.0) and a pair of gradient echo images (s.sub.+1, s.sub.-1). A phase map is generated (90) from the spin and gradient echo images. One of the gradient echo images is corrected (116) with the phase map. The phase corrected gradient image is additively combined (118) with the spin echo image to generate a first species image (112) and is subtractively combined (120) to generate a second species image (114).
摘要翻译：在时间上恒定的磁场中，磁共振在受试者的第一和第二物种偶极中被激发（50）。共振被重新聚焦（52）以产生以第一和第二种类共振信号同相为中心的时间的自旋回波（54）。生成梯度回波（64,68），以自旋回波之前和之后的时间（2n + 1）pi /deltaω为中心，其中Δω是第一和第二种类共振频率之间的差。以这种方式，第一和第二种类信号在梯度回波中为180°异相。共振重新聚焦（82）一次或多次以产生具有不同相位编码的额外的自旋和梯度回波（78）。用更多的相位编码重复序列，并将来自自旋回波和两个梯度回波的磁共振信号重建（86）到自旋回波图像（s0）和一对梯度回波图像（s + 1，s- 1）。从旋转和渐变回波图像生成相位图（90）。梯度回波图像之一用相位图校正（116）。将相位校正的梯度图像与自旋回波图像相加地组合（118）以产生第一物种图像（112）并被减法组合（120）以产生第二物种图像（114）。

46. 发明申请

US20150146929A1 STATIONARY TARGET DETECTION BY EXPLOITING CHANGES IN BACKGROUND MODEL 有权
标题翻译：通过在背景模型中发现变化的静态目标检测
公开(公告)号：US20150146929A1
公开(公告)日：2015-05-28
申请号：US14610582
申请日：2015-01-30
申请人： Khurram Hassan-Shafique , Péter L. Venetianer , Li Yu , Haiying Liu
发明人： Khurram Hassan-Shafique , Péter L. Venetianer , Li Yu , Haiying Liu
IPC分类号： G06K9/00 , G06K9/62
CPC分类号： G06K9/00771 , G06K9/62 , G06K9/6267 , G08B13/19602
摘要： Provided is a computer-implemented method for processing one or more video frames. The meth can include generating, by a processor, a change in value of one or more pixels obtained from the one or more video frames; classifying, by the processor, the change in value of the one or more pixels to produce one or more classes of the change in value of the one or more pixels, wherein the one or more classes include one or more of a stationary target, a moving target, a target insertion, a target removal, or a local change; and constructing, by the processor, a listing of detected targets based on the one or more classes.
摘要翻译：提供了一种用于处理一个或多个视频帧的计算机实现的方法。该技术可以包括由处理器生成从一个或多个视频帧获得的一个或多个像素的值的改变; 由所述处理器对所述一个或多个像素的值的变化进行分类，以产生所述一个或多个像素的值的变化的一个或多个类别，其中所述一个或多个类包括静止目标，移动目标，目标插入，目标移除或本地更改; 以及由所述处理器构建基于所述一个或多个类的检测到的目标的列表。

47. 发明授权

US08401229B2 Stationary target detection by exploiting changes in background model 有权
标题翻译：通过利用背景模型的变化进行固定目标检测
公开(公告)号：US08401229B2
公开(公告)日：2013-03-19
申请号：US12204562
申请日：2008-09-04
申请人： Khurram Hassan-Shafique , Peter L. Venetianer , Li Yu , Haiying Liu
发明人： Khurram Hassan-Shafique , Peter L. Venetianer , Li Yu , Haiying Liu
IPC分类号： G06K9/00
CPC分类号： G06K9/00771 , G06K9/62 , G06K9/6267 , G08B13/19602
摘要： A sequence of video frames of an area of interest is obtained. A first background model of the area of interest is constructed based on a first parameter. A second background model of the area of interest is constructed based on a second parameter, the second parameter being different from the first parameter. A difference between the first and second background models is determined. A stationary target is determined based on the determined difference. An alert concerning the stationary target is generated.
摘要翻译：获得感兴趣区域的视频帧序列。基于第一参数构建感兴趣区域的第一背景模型。基于第二参数构建感兴趣区域的第二背景模型，第二参数不同于第一参数。确定第一和第二背景模型之间的差异。基于确定的差异来确定固定目标。产生关于固定目标的警报。

48. 发明申请

US20090060278A1 STATIONARY TARGET DETECTION BY EXPLOITING CHANGES IN BACKGROUND MODEL 有权
标题翻译：通过在背景模型中发现变化的静态目标检测
公开(公告)号：US20090060278A1
公开(公告)日：2009-03-05
申请号：US12204562
申请日：2008-09-04
申请人： Khurram HASSAN-SHAFIQUE , Peter L. Venetianer , Li Yu , Haiying Liu
发明人： Khurram HASSAN-SHAFIQUE , Peter L. Venetianer , Li Yu , Haiying Liu
IPC分类号： G06K9/00 , G08B21/00
CPC分类号： G06K9/00771 , G06K9/62 , G06K9/6267 , G08B13/19602
摘要： A sequence of video frames of an area of interest is obtained. A first background model of the area of interest is constructed based on a first parameter. A second background model of the area of interest is constructed based on a second parameter, the second parameter being different from the first parameter. A difference between the first and second background models is determined. A stationary target is determined based on the determined difference. An alert concerning the stationary target is generated.
摘要翻译：获得感兴趣区域的视频帧序列。基于第一参数构建感兴趣区域的第一背景模型。基于第二参数构建感兴趣区域的第二背景模型，第二参数与第一参数不同。确定第一和第二背景模型之间的差异。基于确定的差异来确定固定目标。产生关于固定目标的警报。

49. 发明授权

US06782288B2 Method and apparatus for positioning a device in a body 有权
标题翻译：用于将装置定位在身体中的方法和装置
公开(公告)号：US06782288B2
公开(公告)日：2004-08-24
申请号：US09792566
申请日：2001-02-23
申请人： Charles Truwit , Haiying Liu
发明人： Charles Truwit , Haiying Liu
IPC分类号： A61B505
CPC分类号： A61B90/11 , A61B34/10 , A61B34/70 , A61B2017/00115 , A61B2018/2025 , A61B2090/374
摘要： There is disclosed a method of positioning an interventional device in a body using a guide pivoting about a pivot point, performed by locating the spatial coordinates of a target and the pivot point, determining a third point outside of the body lying along or proximate a line extending through the target and pivot point, and aligning the axis of the guide with the third point using an imaging system. There is also disclosed a medical imaging system including a processing unit and computer software operative on the processing unit to permit an operator of the system to locate the spatial coordinates of a target point and a pivot point of a guide, and determine a third point outside of the body lying along or proximate a line extending through the target and pivot point. This medical imaging system may further include computer software operative on the processing unit to assist an operator in obtaining an image by which the axis of the guide can be aligned with the third point using an imaging system. There is also disclosed an article of manufacture formed by a computer program encoded in a carrier, wherein the program is operative on a processing unit of a medical imaging system to permit an operator of the system to locate the spatial coordinates of a target point and a pivot point of a guide, and determine a third point outside of the body lying along or proximate a line extending through the target and pivot point.
摘要翻译：公开了一种使用围绕枢轴点引导枢转的定位介入装置的方法，其通过定位目标和枢转点的空间坐标来执行，确定沿着或靠近线的身体的第三点延伸穿过目标和枢转点，并且使用成像系统将引导件的轴线与第三点对齐。还公开了一种医疗成像系统，包括处理单元和在处理单元上操作的计算机软件，以允许系统的操作者定位目标点和引导件的枢轴点的空间坐标，并且确定外部的第三点身体沿着或靠近延伸穿过目标和枢转点的线路。该医学成像系统还可以包括在处理单元上操作的计算机软件，以帮助操作者获得图像，通过该图像，引导件的轴线可以使用成像系统与第三点对准。还公开了一种通过编码在载体中的计算机程序形成的制品，其中该程序在医学成像系统的处理单元上操作，以允许系统的操作者定位目标点的空间坐标和并且确定沿着或靠近延伸穿过目标点和枢转点的线的身体外部的第三点。

50. 发明授权

US6043652A Alternative reconstruction method for non-equidistant k-space data 失效
标题翻译：非等距k空间数据的替代重建方法
公开(公告)号：US6043652A
公开(公告)日：2000-03-28
申请号：US840964
申请日：1997-04-17
申请人： Haiying Liu
发明人： Haiying Liu
IPC分类号： G01R33/32 , A61B5/055 , G01R33/561 , G01R33/565 , G06T1/00 , G01V3/00
CPC分类号： G01R33/5615 , G01R33/56545
摘要： An alegebraic reconstruction matrix generator (90) generates an algebraic reconstruction matrix P. A gradient trajectory memory (94) contains elements k.sub.n which describe the k-space trajectory of a time-varying read gradient wave form. An A-matrix generator (96) generates a coefficient matrix A from the elements k.sub.n. A D-matrix generator (100) generates a diagonal matrix D having elements d.sub.n. Using the elements of matrices A and D, an H-matrix generator creates a matrix H. An inverter (110) inverts the matrix to obtain H.sup.-1. A transposer (112) transposes matrix A to obtain A.sup.T. A multiplication processor (114) combines H.sup.-1, A.sup.T, and D to obtain the algebraic reconstruction matrix P. A multiplication processor (122) then combines the matrix P and an array of image data lines b to generate an image matrix array X which is stored in an image memory (124). A one-dimensional column Fourier transform processor and associated memory (125) transforms and stores the image matrix array. A video processor (126) converts the image matrix array into an appropriate format for display on a video monitor (130). The image data sampling can be performed at previously unused portions of a read gradient wave form, thus reducing image acquisition time.
摘要翻译：一个有声重建矩阵发生器（90）产生一个代数重建矩阵P.一个梯度轨迹存储器（94）包含描述时变读取梯度波形的k空间轨迹的元素kn。 A矩阵生成器（96）从元素kn生成系数矩阵A. D矩阵生成器（100）生成具有元素dn的对角矩阵D. 使用矩阵A和D的元素，H矩阵发生器创建矩阵H.逆变器（110）反转矩阵以获得H-1。转移器（112）转置矩阵A以获得AT。乘法处理器（114）组合H-1，AT和D以获得代数重建矩阵P.然后，乘法处理器（122）组合矩阵P和图像数据线b的阵列以生成图像矩阵阵列X，其中被存储在图像存储器（124）中。一维列傅里叶变换处理器和相关联存储器（125）转换并存储图像矩阵阵列。视频处理器（126）将图像矩阵阵列转换成适当的格式以在视频监视器（130）上显示。可以在读取梯度波形的先前未使用的部分执行图像数据采样，从而减少图像采集时间。

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