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51. 发明授权

US4591789A Method for correcting image distortion due to gradient nonuniformity 失效
标题翻译：用于校正由于梯度不均匀性引起的图像失真的方法
公开(公告)号：US4591789A
公开(公告)日：1986-05-27
申请号：US565256
申请日：1983-12-23
申请人： Gary H. Glover , Norbert J. Pelc
发明人： Gary H. Glover , Norbert J. Pelc
IPC分类号： A61B10/00 , A61B5/055 , G01R33/385 , G01R33/48 , G01R33/565 , G01R33/20
CPC分类号： G01R33/56518 , G01R33/385
摘要： A method for correcting image distortion arising from magnetic field gradient nonuniformity in accordance with which the gradient nonuniformity is modeled, the expected distortion in the image calculated, and a geometric correction applied to the distorted image. In the preferred embodiment, polynomial interpolation is used to implement the geometric correction.
摘要翻译：用于校正由磁场梯度不均匀性引起的图像失真的方法，根据该方法对梯度不均匀性进行建模，计算出的图像中的期望失真以及应用于失真图像的几何校正。在优选实施例中，使用多项式插值来实现几何校正。

52. 发明授权

US09435900B2 X-ray system utilizing alternating spectrum x-ray source in conjuction with a fixed spectrum separation filter approval 有权
标题翻译： X光系统利用交替光谱X射线源结合固定频谱分离滤波器批准
公开(公告)号：US09435900B2
公开(公告)日：2016-09-06
申请号：US13491412
申请日：2012-06-07
申请人： Yuan Yao , Norbert J. Pelc
发明人： Yuan Yao , Norbert J. Pelc
IPC分类号： G01N23/087 , A61B6/00 , G01T1/29 , G01N23/04
CPC分类号： G01T1/2985 , A61B6/4042 , G01N23/046 , G01N23/087 , G01N2223/419
摘要： An apparatus for x-ray imaging of an object is provided. An x-ray source for providing alternating x-ray spectrums is placed on a first side of the object. A spectrum separation fixed filter is placed between the x-ray source and the object. An x-ray detector is placed on a second side of the object opposite the x-ray source. A controller controls the x-ray source and the x-ray detector.
摘要翻译：提供了一种用于物体的X射线成像的装置。用于提供交替X射线光谱的x射线源放置在物体的第一侧上。光谱分离固定滤光片放置在x射线源和物体之间。 X射线检测器被放置在与X射线源相对的物体的第二侧上。控制器控制x射线源和x射线探测器。

53. 发明授权

US09392984B2 Computed tomography system with dynamic bowtie filter 有权
标题翻译：计算机断层摄影系统与动态蝴蝶结过滤器
公开(公告)号：US09392984B2
公开(公告)日：2016-07-19
申请号：US14125926
申请日：2012-06-14
申请人： Norbert J. Pelc , Scott Hsieh
发明人： Norbert J. Pelc , Scott Hsieh
IPC分类号： A61B6/06 , G21K1/10 , G02B5/20 , A61B6/00 , G02B5/22 , G02B26/02 , A61B6/03
CPC分类号： A61B6/4035 , A61B6/032 , A61B6/06 , A61B6/405 , A61B6/4241 , A61B6/44 , A61B6/547 , A61B6/583 , G02B5/201 , G02B5/22 , G02B26/02 , G21K1/10
摘要： A CT apparatus for scanning an object is provided. An x-ray source is provided, wherein the x-ray source provides a collimated x-ray beam with a cross-section with a length and thickness. A plurality of wedges is provided between the source and object. An actuator is connected to the wedges for moving the wedges substantially perpendicular to the length of the cross-section of the collimated x-ray beam. An x-ray detector is located on an opposite side of the object from the x-ray source and is for detecting x-rays that pass through the object and the plurality of wedges. A gantry rotates the x-ray source, the plurality of wedges, and the x-ray detector around an axis of rotation.
摘要翻译：提供一种用于扫描物体的CT装置。提供了一种x射线源，其中x射线源提供具有长度和厚度的横截面的准直X射线束。在源和物体之间提供多个楔形件。致动器连接到楔块，用于基本上垂直于准直X射线束横截面的长度移动楔块。 X射线检测器位于物体与x射线源相反的一侧，用于检测穿过物体和多个楔形物的X射线。台架围绕旋转轴旋转x射线源，多个楔形物和x射线探测器。

54. 发明授权

US07734004B2 Gain correction for a CT system 有权
标题翻译： CT系统的增益校正
公开(公告)号：US07734004B2
公开(公告)日：2010-06-08
申请号：US11851609
申请日：2007-09-07
申请人： Jongduk Baek , Norbert J. Pelc
发明人： Jongduk Baek , Norbert J. Pelc
IPC分类号： A61B6/00
CPC分类号： G06T11/005 , A61B6/032
摘要： A method for imaging unknown objects in a computed tomography (CT) system, comprising determining ray gain for a known object is provided. A CT reconstruction is performed with the known object to obtain reconstructed values. Ideal values are obtained for pixels of the known object. An error related to a difference between the reconstructed values and the ideal values is generated. A ray gain is estimated that reduces the error.
摘要翻译：提供了一种用于对计算机断层摄影（CT）系统中的未知物体进行成像的方法，包括确定已知物体的射线增益。使用已知对象执行CT重建以获得重建的值。为已知对象的像素获得理想值。产生与重建值和理想值之间的差异相关的误差。估计减少误差的射线增益。

55. 发明申请

US20090208086A1 Compression and decompression of raw image data 审中-公开
标题翻译：原始图像数据的压缩和解压缩
公开(公告)号：US20090208086A1
公开(公告)日：2009-08-20
申请号：US12378480
申请日：2009-02-13
申请人： Norbert J. Pelc
发明人： Norbert J. Pelc
IPC分类号： G06K9/36 , G06K9/00
CPC分类号： G06T9/00 , G06T5/002 , G06T2207/10072 , G06T2207/10116 , G06T2207/10132 , H04N19/124 , H04N19/17 , H04N19/182 , H04N19/503 , H04N19/593 , H04N19/82
摘要： A lossy compression method for raw image data with noise or error shaping is provided. The compression method reduces the low frequency components of the compression error. The noise shaping improves the quality of the image subsequently formed using the decompressed data. For each sample of raw image data to be compressed, the error from a previously compressed sample is added to form a modified sample. The modified sample is then compressed to form a compressed sample. The compressed sample is decompressed to form a decompressed sample. The error is calculated between the decompressed sample and the modified sample. For computed tomography (CT), the compressed samples are decompressed prior to image reconstruction. The applications include x-ray CT, single photon emission computed tomography (SPECT), positron emission tomography (PET), magnetic resonance imaging (MRI), ultrasound, radiography, fluoroscopy, and angiography.
摘要翻译：提供了具有噪声或误差成形的原始图像数据的有损压缩方法。压缩方法降低了压缩误差的低频分量。噪声整形提高了随后使用解压缩数据形成的图像的质量。对于要压缩的原始图像数据的每个样本，添加来自先前压缩样本的错误以形成修改的样本。然后将经修改的样品压缩以形成压缩样品。将压缩的样品减压以形成解压缩的样品。在解压缩样品和经过修改的样品之间计算误差。对于计算机断层扫描（CT），压缩样本在图像重构之前被解压缩。应用包括x射线CT，单光子发射计算机断层扫描（SPECT），正电子发射断层扫描（PET），磁共振成像（MRI），超声，射线照相术，荧光透视和血管造影。

56. 发明授权

US06976953B1 Maintaining the alignment of electric and magnetic fields in an x-ray tube operated in a magnetic field 有权
标题翻译：维持在磁场中操作的x射线管中的电场和磁场的对准
公开(公告)号：US06976953B1
公开(公告)日：2005-12-20
申请号：US10259225
申请日：2002-09-26
申请人： Norbert J. Pelc
发明人： Norbert J. Pelc
IPC分类号： H01J35/14 , H01J35/16 , H05C1/02 , A61B5/05
CPC分类号： H05C1/02 , G01R33/4812 , H01J35/14 , H01J35/16
摘要： A new technique for maintaining the alignment of electric and magnetic fields in an x-ray tube so the tube can be operated in the presence of a static external magnetic field without being negatively affected thereby. Deflection of the electron beam of the x-ray tube by the high magnetic field is reduced or eliminated by modifying or canceling, at a location near the electron beam, the magnetic field components transverse to the beam. In a preferred embodiment, a set of electromagnet coils are positioned on or near the tube and oriented in a way that when current is applied internal magnetic fields are produced in a direction opposite to the transverse magnetic fields, thereby causing cancellation. In one implementation, one or more sensors are used to detect the transverse magnetic fields. The sensor is positioned near the electron beam, either inside or outside the x-ray tube. The sensor produces a signal dependent on a static magnetic field component transverse to the desired direction of the electron beam. This signal is used to control the amount of current applied to the coils. A controller and a feedback circuit may be included to adjust in real time the amount of current being applied.
摘要翻译：一种用于维持X射线管中的电场和磁场的对准的新技术，使得管可以在存在静态外部磁场的情况下操作，而不会受到负面影响。通过在靠近电子束的位置修改或消除横向于光束的磁场分量来减小或消除由高磁场引起的X射线管的电子束的偏转。在优选实施例中，一组电磁线圈定位在管上或附近，并且以使得当施加电流时的方式定向，在与横向磁场相反的方向上产生内部磁场，从而导致取消。在一个实现中，使用一个或多个传感器来检测横向磁场。传感器位于X射线管内部或外部的电子束附近。该传感器产生取决于垂直于电子束所需方向的静态磁场分量的信号。该信号用于控制施加到线圈的电流量。可以包括控制器和反馈电路以实时调整所施加的电流量。

57. 发明授权

US06856134B1 Magnetic resonance imaging with fat-water signal separation 有权
标题翻译：磁共振成像与脂肪水信号分离
公开(公告)号：US06856134B1
公开(公告)日：2005-02-15
申请号：US10445180
申请日：2003-05-23
申请人： Scott B. Reeder , Norbert J. Pelc
发明人： Scott B. Reeder , Norbert J. Pelc
IPC分类号： G01R33/54 , G01V3/00
CPC分类号： G01R33/4828
摘要： A generalized multi-point fat-water separation process is combined with steady-state free precession (SSFP) to obtain high quality images of articular cartilage with reduced imaging time.
摘要翻译：广义多点脂肪水分离过程与稳态自由进动（SSFP）相结合，以缩短成像时间获得关节软骨的高质量图像。

58. 发明授权

US06806709B2 Flow imaging using balanced phase contrast steady state free precession magnetic resonance imaging 有权
标题翻译：流动成像采用平衡相位对比稳态自由进动磁共振成像
公开(公告)号：US06806709B2
公开(公告)日：2004-10-19
申请号：US10317463
申请日：2002-12-11
申请人： Michael Markl , Norbert J. Pelc , Marcus Alley
发明人： Michael Markl , Norbert J. Pelc , Marcus Alley
IPC分类号： G01V300
CPC分类号： G01R33/56308 , G01R33/5613 , G01R33/56316
摘要： A novel technique for velocity measurements (PC-SSFP) is disclosed that combines CINE Phase Contrast (PC) MRI and balanced Steady State Free Precession (SSFP) imaging. Flow encoding is performed without the introduction of additional velocity encoding gradients in order to permit data acquisition with short TR comparable to repetition times of typical SSFP imaging sequences. Sensitivity to through plane velocities is instead established by inverting (i.e. negating) all gradients along the slice select direction. Velocity sensitivity (venc) can be adjusted by altering the first moments of the slice select gradients. Disturbances of the SSFP steady state are avoided by acquiring different flow echoes in consecutively (i.e. sequentially) executed scans, each over several cardiac cycles, using separate steady state preparation periods. Comparison of phantom measurements with those from established 2D-CINE-PC MRI excellent correlation between both modalities. Results of volunteer examinations exhibit advantages of PC-SSFP, which include the intrinsic high signal to noise ratio (SNR) of balanced SSFP and consequently low phase noise in measured velocities. An additional benefit of PC-SSFP is its lower reliance on in-flow dependent signal enhancement, therefore yielding more uniform SNR and better depiction of vessel geometry throughout the whole cardiac cycle in structures with slow and/or pulsatile flow.
摘要翻译：公开了一种用于速度测量（PC-SSFP）的新型技术，其结合了CINE相位对比（PC）MRI和平衡稳态自由进动（SSFP）成像。在不引入附加速度编码梯度的情况下执行流编码，以便允许具有与典型SSFP成像序列的重复时间相当的短TR的数据采集。通过反转（即否定）沿着切片选择方向的所有梯度来建立对平面速度的敏感度。可通过改变切片选择梯度的第一时刻来调整速度灵敏度（venc）。通过使用单独的稳态准备周期，通过采用连续（即顺序）执行的扫描，每个超过几个心动周期来获取SSFP稳态的干扰。幻影测量与来自已建立的2D-CINE-PC MRI的两种模式之间的良好相关性的比较。志愿者考试结果表明PC-SSFP的优点，其包括平衡SSFP的固有高信噪比（SNR），从而测量速度中的低相位噪声。 PC-SSFP的另外一个优点是其对流量依赖信号增强的依赖性较低，因此在具有缓慢和/或脉动流动的结构中，在整个心脏周期中产生更均匀的SNR并更好地描绘血管几何形状。

59. 发明授权

US06784664B2 Fast method for dynamic MR imaging 有权
标题翻译：动态MR成像的快速方法
公开(公告)号：US06784664B2
公开(公告)日：2004-08-31
申请号：US10317462
申请日：2002-12-11
申请人： Zhi-Pei Liang , Norbert J. Pelc
发明人： Zhi-Pei Liang , Norbert J. Pelc
IPC分类号： G01V300
CPC分类号： G01R33/561 , G01R33/4824 , G01R33/56308
摘要： Generalized series-based image reconstruction as used in dynamic imaging for high-speed imaging with limited k-space coverage for each time frame. Further, in acquiring low resolution data for a plurality of image frames, a full k-space data set is generated for each time frame with the measured low-resolution data and high spatial frequency data generated by the GS model constructed based on the high-resolution image(s). The algorithms of the invention have computational complexity of O(N log N) and arc capable of producing high-resolution dynamic images with a small number of Fourier transform samples.
摘要翻译：广泛的基于系列的图像重建，用于动态成像，用于高速成像，每个时间帧有限的k空间覆盖。此外，在获取多个图像帧的低分辨率数据时，针对每个时间帧生成具有所测量的低分辨率数据和由基于高分辨率图像构建的GS模型生成的高空间频率数据的全k空间数据集，分辨率图像。本发明的算法具有O（N log N）和弧的计算复杂度，其能够产生具有少量傅立叶变换样本的高分辨率动态图像。

60. 发明授权

US5998996A Correction of artifacts caused by Maxwell terms in phase contrast angiography 失效
标题翻译：校正由相对比血管造影术中的麦克斯韦术引起的假象
公开(公告)号：US5998996A
公开(公告)日：1999-12-07
申请号：US826183
申请日：1997-03-27
申请人： Matthew A. Bernstein , Xiaohang Zhou , Kevin F. King , Alexander Ganin , Gary H. Glover , Norbert J. Pelc , Jason A. Polzin
发明人： Matthew A. Bernstein , Xiaohang Zhou , Kevin F. King , Alexander Ganin , Gary H. Glover , Norbert J. Pelc , Jason A. Polzin
IPC分类号： G01R33/54 , A61B5/055 , G01R33/563 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56581 , G01R33/56308
摘要： A method is presented for correcting Maxwell term error artifacts produced by an NMR system during the production of either a phase contrast angiogram or a complex difference angiogram. Phase corrections are made to the reconstructed phase image to eliminate the artifacts. Correction coefficients calculated from the flow encoding magnetic gradient waveforms of the phase contrast pulse sequence are used in a polynomial to calculate a set of phase error corrections. These corrections are then used to adjust the phase at each pixel of the angiogram image.
摘要翻译：提出了一种用于在生产相位对比血管造影或复杂差异血管造影图中校正由NMR系统产生的麦克斯韦尔术语误差伪像的方法。对重建的相位图像进行相位校正，以消除伪影。由相位对比脉冲序列的流量编码磁梯度波形计算的校正系数用于多项式以计算一组相位误差校正。然后使用这些校正来调整血管造影图像的每个像素处的相位。

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