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81. 发明授权

US5680862A Iterative method of determining trajectory of a moving region in a moving material using velocity measurements in a fixed frame of reference 失效
标题翻译：使用固定参考系中的速度测量来确定移动材料中运动区域的轨迹的迭代方法
公开(公告)号：US5680862A
公开(公告)日：1997-10-28
申请号：US381801
申请日：1995-02-01
申请人： Samuel M. Song , Norbert J. Pelc
发明人： Samuel M. Song , Norbert J. Pelc
IPC分类号： G06T7/20 , A61B5/055
CPC分类号： G06T7/20
摘要： Several algorithms are presented for determining the trajectory of a particle in motion given cine phase contrast (PC) velocity field data. The PC velocity field is usually measured in a fixed frame of reference (spatial coordinates) and must be transformed to the velocity in material coordinates, i.e., the velocity experienced by individual points in the medium. The material velocity field can then be integrated to yield the trajectory of a particular point. Therefore, to determine the trajectory of a particular point, the given spatial velocity field must be transformed to the material velocity field. While there exists a mathematical relationship that maps velocity fields in spatial coordinates to material coordinates, this mapping can be applied only if particle trajectories are known. Although there appears to be a dilemma here, through an optimization technique, we have devised an iterative procedure to determine the optimal trajectory in the sense to be defined.
摘要翻译：提出了几种算法来确定给定电影相位对比（PC）速度场数据的运动中的粒子的轨迹。 PC速度场通常以固定的参考坐标（空间坐标）测量，并且必须被转换为材料坐标中的速度，即介质中各个点所经历的速度。然后可以将材料速度场积分成一个特定点的轨迹。因此，为了确定特定点的轨迹，必须将给定的空间速度场转换为材料速度场。虽然存在将空间坐标中的速度场映射到材料坐标的数学关系，但是只有当粒子轨迹是已知的时，才能应用该映射。虽然在这里似乎有一个困境，通过优化技术，我们设计了一个迭代过程，以确定在要定义的意义上的最佳轨迹。

82. 发明授权

US5653233A Method and apparatus for improved temporal resolution in dynamic MRI 失效
标题翻译：用于改善动态MRI中时间分辨率的方法和装置
公开(公告)号：US5653233A
公开(公告)日：1997-08-05
申请号：US514292
申请日：1995-08-11
申请人： Norbert J. Pelc , Jill O. Fredrickson
发明人： Norbert J. Pelc , Jill O. Fredrickson
IPC分类号： G01R33/561 , A61B5/00
CPC分类号： G01R33/561 , G01R33/4824 , G01R33/56308
摘要： Temporal resolution in dynamic magnetic resonance imaging is obtained by establishing a representation of static material in the field of view by averaging all signal acquisitions for a full field of view, and Fourier transforming the averaged data to yield an averaged image. The known dynamic portion of the image is set to zero to yield an image restricted to the static portion of the image. The averaged static portion is then inverse transformed to generate a synthetic MR raw data set that is an estimate of the data that would be collected if the object consisted only of the static material. The synthetic data are subtracted from the MR data for each view to eliminate the data for static material. The resulting data then represents the dynamic material which can be individually reconstructed.
摘要翻译：在动态磁共振成像中的时间分辨率是通过对全视场的所有信号采集进行平均建立视场中的静态材料的表示，并对平均数据进行傅里叶变换以获得平均图像来获得的。图像的已知动态部分被设置为零以产生限于图像的静态部分的图像。然后对平均的静态部分进行逆变换以产生合成MR原始数据集，其是如果对象仅由静态材料组成的则将被收集的数据的估计。从每个视图的MR数据中减去合成数据，以消除静态资料的数据。所得到的数据然后表示可以单独重建的动态材料。

83. 发明授权

US5469486A Projection domain reconstruction method for helical scanning computed tomography apparatus with multi-column detector array employing overlapping beams 失效
标题翻译：用于具有使用重叠光束的多列检测器阵列的螺旋扫描计算机断层摄影装置的投影域重建方法
公开(公告)号：US5469486A
公开(公告)日：1995-11-21
申请号：US151456
申请日：1993-11-08
申请人： Hui Hu , Norbert J. Pelc , Armin H. Pfoh
发明人： Hui Hu , Norbert J. Pelc , Armin H. Pfoh
IPC分类号： A61B6/03 , G01T1/29 , G06T11/00 , G01N23/083
CPC分类号： G01T1/2985 , A61B6/032 , G06T11/005 , A61B6/027 , Y10S378/901
摘要： An x-ray computed tomography system for helically scanning a patient translates the patient as projections of the patient at various beam angles are obtained. The projection data are weighted prior to reconstruction to account for multiply measured projection data and the deviation of the cone beam from a parallel beam approximation.
摘要翻译：用于螺旋扫描患者的X射线计算机断层摄影系统在获得患者的各种波束角的投影的情况下翻译患者。投影数据在重建之前被加权，以考虑多重测量的投影数据和锥形束与平行光束近似的偏差。

84. 发明授权

US5430783A Reconstruction method for helical scanning computed tomography apparatus with multi-row detector array employing overlapping beams 失效
标题翻译：具有使用重叠光束的多行检测器阵列的螺旋扫描计算机断层摄影装置的重建方法
公开(公告)号：US5430783A
公开(公告)日：1995-07-04
申请号：US8928
申请日：1993-01-26
申请人： Hui Hu , Norbert J. Pelc , Armin H. Pfoh
发明人： Hui Hu , Norbert J. Pelc , Armin H. Pfoh
IPC分类号： A61B6/03 , G01T1/29 , G06T11/00 , G01N23/083
CPC分类号： A61B6/4085 , A61B6/027 , A61B6/032 , A61B6/4028 , G01T1/2985 , G06T11/005 , G06T11/006 , G06T2211/421 , Y10S378/901
摘要： An x-ray computed tomography system for helically scanning a patient translates the patient as projections of the patient at various beam angles are obtained. A cone beam reconstruction method, which accounts for the divergence of the rays of a fan beam of x-rays, is used to reconstruct multiple narrow slices which are combined to provide a larger slice with an improved slice profile. The conical shape of the fan beam causes some voxels to be scanned more than once for a given beam angle and this extra data is weighted and combined with its counterpart data to improve the quality of the image.
摘要翻译：用于螺旋扫描患者的X射线计算机断层摄影系统在获得患者的各种波束角的投影的情况下翻译患者。用于考虑X射线扇形束的射线发散度的锥形束重建方法被用于重建多个窄片，其被组合以提供具有改进的切片轮廓的较大切片。风扇光束的圆锥形状使一些体素对于给定的光束角被多次扫描，并且该额外数据被加权并与其对应数据组合以提高图像的质量。

85. 发明授权

US5402067A Apparatus and method for rare echo imaging using k-space spiral coverage 失效
标题翻译：使用k空间螺旋覆盖的稀有回波成像的装置和方法
公开(公告)号：US5402067A
公开(公告)日：1995-03-28
申请号：US101865
申请日：1993-08-04
申请人： John M. Pauly , Daniel M. Spielman , Craig H. Meyer , Albert Macovski , Norbert J. Pelc
发明人： John M. Pauly , Daniel M. Spielman , Craig H. Meyer , Albert Macovski , Norbert J. Pelc
IPC分类号： G01R33/20 , A61B5/055 , G01R33/48 , G01R33/561 , G01V3/00
CPC分类号： G01R33/5615 , G01R33/446 , G01R33/5617
摘要： A long train of spin echoes is produced using a RARE excitation pulse sequence, and during each spin echo an annular segment of a long k-space spiral as determined by read-out magnetic gradients is detected. At the end of the echo train the entire k-space spiral will have been covered. Each of the segments can be a unique annular portion of the k-space spiral. Alternatively, fewer annular segments of the spiral can be provided, with the fewer annular segments rotated in k-space and replayed to cover interleaved paths in k-space. The imaging gradients are refocused at the time of each spin-echo pulse in order to permit the long echo pulse trains of RARE imaging. Each spiral segment is surrounded by gradient lobes that move out from the k-space origin to the beginning of the segment, and move back to the origin from the end of the segment. Advantageously, the magnetic gradient lobes can be produced concurrently with parasitic echo crusher gradients at the beginning and end of each spin-echo pulse. Further, off-resonance effects can be placed in sidelobes of the spin-echo signal to facilitate suppression in the detected signals.
摘要翻译：使用RARE激励脉冲序列产生长串自旋回波，并且在每个自旋回波期间，检测由读出磁梯度确定的长k空间螺旋的环形段。在回波列车的末端，整个k空间螺旋将被覆盖。每个段可以是k空间螺旋的独特的环形部分。或者，可以提供更少的螺旋环形段，其中较少的环形段在k空间中旋转并且重播以覆盖k空间中的交错路径。在每个自旋回波脉冲时，成像梯度被重新聚焦，以便允许RARE成像的长回波脉冲序列。每个螺旋段由从k空间原点移出到段的开头的梯度波瓣包围，并从段的末尾返回到原点。有利地，可以在每个自回波脉冲的开始和结束处与寄生回波破碎机梯度同时产生磁梯度波瓣。此外，离共振效应可以置于自旋回波信号的旁瓣中，以便于检测信号中的抑制。

86. 发明授权

US5399970A Phase-contrast MRI using phased-array multicoil 失效
标题翻译：使用相控阵多相的相位对比MRI
公开(公告)号：US5399970A
公开(公告)日：1995-03-21
申请号：US104751
申请日：1993-08-11
申请人： Norbert J. Pelc , Thomas J. Brosnan
发明人： Norbert J. Pelc , Thomas J. Brosnan
IPC分类号： G01R33/20 , A61B5/055 , G01R33/32 , G01R33/3415 , G01R33/54 , G01V3/00
CPC分类号： G01R33/3415
摘要： MRI signals detected by a phased array of multicoils are combined to provide phase contrast image signals with improved signal-to-noise ratio. Detected complex image signals are obtained for different magnetic gradients and are combined to obtain phase, magnitude, and magnitude weighted image signals for imaging.
摘要翻译：由相位阵列的多芯片检测的MRI信号被组合以提供具有改善的信噪比的相位差图像信号。对于不同的磁梯度获得检测到的复合图像信号，并且被组合以获得用于成像的相位，幅度和幅度加权的图像信号。

87. 发明授权

US5195525A Noninvasive myocardial motion analysis using phase contrast MRI maps of myocardial velocity 失效
标题翻译：使用相对对比度的非肌肉运动分析运动心肌超声心动图
公开(公告)号：US5195525A
公开(公告)日：1993-03-23
申请号：US617904
申请日：1990-11-26
申请人： Norbert J. Pelc
发明人： Norbert J. Pelc
IPC分类号： A61B5/055 , A61B5/11 , G01R33/561 , G01R33/563 , G01R33/567 , G06T1/00 , G06T7/20 , H04N7/18
CPC分类号： G01R33/563 , G01R33/5617 , G01R33/56316 , G01R33/5676
摘要： Motion and deformation is assessed and imaged using phase contrast magnetic resonance imaging for determining velocity of a plurality of regions at a plurality of frames during a period of interest such as the cardiac cycle. A region of interest is tracked from frame to frame and based on a known last position and the velocity at the known position. Strain and rotation are determined from the changes in velocity along selected axes.

88. 发明授权

US5093620A Encoding for NMR phase contrast flow measurement 失效
标题翻译：编码NMR相位对流流量测量
公开(公告)号：US5093620A
公开(公告)日：1992-03-03
申请号：US564945
申请日：1990-08-09
申请人： Norbert J. Pelc , Gary H. Glover
发明人： Norbert J. Pelc , Gary H. Glover
IPC分类号： A61B5/055 , G01F1/716 , G01F11/00 , G01F15/00 , G01P13/00 , G01R33/54 , G01R33/563
CPC分类号： G01F1/716 , G01R33/563 , G01R33/4822 , G01R33/56316
摘要： In an NMR system a method for measuring the motion of spins moving in an unknown direction includes four separate measurement cycles. The first cycle establishes a reference phase and each of the subsequent three measurement cycles includes motion encoding field gradients for measuring motion along respective pairs of Cartesian coordinates. All four measurements are combined to calculate each of the motion components along x, y and z coordinates.

89. 发明授权

US4952876A Variable bandwidth multiecho NMR imaging 失效
标题翻译：可变带宽多孔NMR成像
公开(公告)号：US4952876A
公开(公告)日：1990-08-28
申请号：US420715
申请日：1989-10-12
申请人： Norbert J. Pelc
发明人： Norbert J. Pelc
IPC分类号： G01R33/54 , G01R33/56 , G01R33/561
CPC分类号： G01R33/54 , G01R33/56 , G01R33/5608 , G01R33/5617 , G01R33/56554
摘要： A multiecho NMR pulse sequence is modified such that the bandwidth of the encoded NMR echo signal is reduced for the second NMR echo signal. This reduction is achieved by reducing the magnitude of the read-out magnetic field gradient, increasing the duration of the acquisition by a proportional amount and decreasing the sample rate by a proportional amount for the second NMR echo signal.
摘要翻译：修改多重核磁共振NMR脉冲序列，使得对于第二NMR回波信号，编码的NMR回波信号的带宽减小。通过减小读出磁场梯度的大小，将采集的持续时间增加一个比例量并且将采样率降低到第二次NMR回波信号的比例量来实现。

90. 发明授权

US4896113A Use of repeated gradient echoes for noise reduction and improved NMR imaging 失效
标题翻译：使用重复梯度回波降噪和改进NMR成像
公开(公告)号：US4896113A
公开(公告)日：1990-01-23
申请号：US368145
申请日：1989-06-16
申请人： Norbert J. Pelc
发明人： Norbert J. Pelc
IPC分类号： G01R33/50 , G01R33/56 , G01R33/565
CPC分类号： G01R33/56 , G01R33/50 , G01R33/56509 , G01R33/56536 , G01R33/56563
摘要： A pulse sequence of an NMR system is disclosed which produces two spin echo signals which may be acquired. In addition, one or more gradient echos are produced and acquired. The gradient echo data is combined with the spin echo data to improve signal to noise ratio, provide T.sub.2 ' mapping, reduce motion induced artifacts, measure and correct for RF pulse imperfections, and to provide improved T.sub.2 measurement.
摘要翻译：公开了NMR系统的脉冲序列，其产生可以获取的两个自旋回波信号。此外，产生和获取一个或多个梯度回波。梯度回波数据与自旋回波数据组合以提高信噪比，提供T2'映射，减少运动诱导的伪像，测量和校正RF脉冲缺陷，并提供改进的T2测量。

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