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1. 发明申请

US20100124310A1 DATA NORMALIZATION IN INVERSE GEOMETRY COMPUTED TOMOGRAPHY SYSTEM 有权
标题翻译：反相几何计算机图像系统中的数据正规化
公开(公告)号：US20100124310A1
公开(公告)日：2010-05-20
申请号：US12273223
申请日：2008-11-18
申请人： Norbert J. Pelc , Jongduk Baek
发明人： Norbert J. Pelc , Jongduk Baek
IPC分类号： A61B6/00
CPC分类号： A61B6/032 , A61B6/583
摘要： A method for imaging an object in a computed tomography (CT) system with a plurality of sources comprising a first source and a second source, wherein the plurality of sources together with a detector array are mounted on a rotatable gantry, and wherein an intensity of the second source has unknown fluctuations is provided. Projection data is collected using the first source in a first gantry position. Projection data is collected using the second source in a second gantry position, wherein projection data from the first source in the first gantry position substantially overlaps projection data from the second source in the second gantry position. Data from the first source at the first gantry position is used to correct for source fluctuations of the second source at the second gantry position.
摘要翻译：一种用于在具有多个源的计算机断层摄影（CT）系统中对物体进行成像的方法，所述多个源包括第一源和第二源，其中所述多个源与检测器阵列一起安装在可旋转机架上，并且其中强度第二个来源提供了未知的波动。在第一台架位置使用第一源收集投影数据。在第二台架位置使用第二源收集投影数据，其中来自第一台架位置的第一源的投影数据在第二台架位置中基本上与来自第二源的投影数据重叠。来自第一机架位置处的第一源的数据用于校正第二机架位置处的第二源的源波动。

2. 发明授权

US07388940B1 Architectures for cardiac CT based on area x-ray sources 有权
标题翻译：基于区域x射线源的心脏CT建筑
公开(公告)号：US07388940B1
公开(公告)日：2008-06-17
申请号：US11563065
申请日：2006-11-24
申请人： Bruno K. B. De Man , Norbert J. Pelc
发明人： Bruno K. B. De Man , Norbert J. Pelc
IPC分类号： G01N23/083
CPC分类号： A61B6/503 , A61B6/032 , A61B6/4014 , A61B6/4085
摘要： A CT imaging system includes a rotatable gantry having an opening to receive an object to be scanned having a small field-of-view (FOV) inside a large FOV. A plurality of area sources is attached to the rotatable gantry, each area source includes a plurality of x-ray emission sources, wherein the plurality of area sources are configured to emit x-rays toward the object. A plurality of x-ray detector arrays is attached to the gantry and positioned such that at least a first detector array and a second detector array each receive x-rays that pass through at least the entire small FOV of the object.
摘要翻译： CT成像系统包括可旋转机架，其具有用于接收在大FOV内部具有小视场（FOV）的待扫描对象的开口。多个区域源附接到可旋转机架，每个区域源包括多个x射线发射源，其中多个区域源被配置为向物体发射X射线。多个x射线检测器阵列连接到台架并且定位成使得至少第一检测器阵列和第二检测器阵列各自接收穿过至少对象的整个小FOV的x射线。

3. 发明申请

US20080049891A1 METHODS FOR ANALYTIC RECONSTRUCTION FOR MULT-SOURCE INVERSE GEOMETRY CT 有权
标题翻译：用于多源反演几何CT的分析重建方法
公开(公告)号：US20080049891A1
公开(公告)日：2008-02-28
申请号：US11741359
申请日：2007-04-27
申请人： Zhye Yin , Jed Douglas Pack , Bruno K.B. De Man , Norbert J. Pelc
发明人： Zhye Yin , Jed Douglas Pack , Bruno K.B. De Man , Norbert J. Pelc
IPC分类号： G06T11/00
CPC分类号： G06T11/006 , G06T2211/416 , G06T2211/421
摘要： Disclosed are embodiments of methods for reconstructing x-ray projection data (e.g., one or more sinograms) acquired using a multi-source, inverse-geometry computed tomography (“IGCT”) scanner. One embodiment of a first method processes an IGCT sinogram by rebinning first in “z” and then in “xy,” with feathering applied during the “xy” rebinning. This produces an equivalent of a multi-axial 3rd generation sinogram, which may be further processed using a parallel derivative and/or Hilbert transform. A TOM-window (with feathering) technique and a combined backprojection technique may also be applied to produce a reconstructed volume. An embodiment of a second method processes an IGCT sinogram using a parallel derivative and/or redundancy weighting. The second method may also use signum weighting, TOM-windowing (with feathering), backprojection, and a Hilbert Inversion to produce another reconstructed volume.
摘要翻译：公开了用于重建使用多源反相几何计算机断层摄影（“IGCT”）扫描仪获取的x射线投影数据（例如，一个或多个正弦图）的方法的实施例。第一种方法的一个实施例通过在“z”中首先重新组合，然后在“xy”中重新组合来处理IGCT正弦图，在“xy”重组期间应用羽化。这产生等效的多轴向第三代正弦图，其可以使用平行导数和/或希尔伯特变换进一步处理。 TOM窗口（具有羽化）技术和组合的反投影技术也可以应用于产生重建体积。第二种方法的实施例使用并行导数和/或冗余加权处理IGCT正弦图。第二种方法还可以使用信号加权，TOM窗口（具有羽化），反投影和希尔伯特反演来产生另一个重建的体积。

4. 发明授权

US07145981B2 Volumetric computed tomography (VCT) 有权
公开(公告)号：US07145981B2
公开(公告)日：2006-12-05
申请号：US11184537
申请日：2005-07-19
申请人： Norbert J. Pelc
发明人： Norbert J. Pelc
IPC分类号： G21K1/12
CPC分类号： A61B6/032 , A61B6/03 , A61B6/06 , A61B6/4007 , A61B6/4028 , A61B6/4085 , A61B6/466 , A61B6/5205
摘要： The present invention provides a volumetric computed tomography (VCT) system capable of producing data for reconstructing an entire three-dimensional (3D) image of a subject during a single rotation without suffering from cone beam artifacts. The VCT system comprises an array of source positions distributed along a line parallel to an axis of rotation, a plurality of collimators, and an array of x-ray detectors. In a preferred embodiment, a reversed imaging geometry is used. A 2D array of source positions provides x-rays emanating from each focal spot toward an array of detectors. The x-rays are restricted by a collimator array and measured by a detector array separately per each source position. The axial extent of the source array and the detector array are comparable to or larger than the axial extent of the portion of the object being imaged.

5. 发明授权

US06975895B1 Modified X-ray tube for use in the presence of magnetic fields 有权
标题翻译：用于存在磁场的改进的X射线管
公开(公告)号：US06975895B1
公开(公告)日：2005-12-13
申请号：US09823889
申请日：2001-03-30
申请人： Norbert J. Pelc , Rebecca Fahrig , Marcus T. Alley , Zhifei Wen
发明人： Norbert J. Pelc , Rebecca Fahrig , Marcus T. Alley , Zhifei Wen
IPC分类号： H01J35/14 , H01J35/16 , H05C1/02 , H01J35/30 , A61B5/05
CPC分类号： H05C1/02 , G01R33/4812 , H01J35/14 , H01J35/16
摘要： An imaging system and method combines a magnetic resonance imaging (MRI) system and an x-ray fluoroscopy system such that the two systems have coincident fields of view. X-rays are generated by a stationary anode x-ray tube in which an electron beam is accelerated from a cathode to an anode. In the presence of the static magnetic field of the MRI system, the electron beam is deflected unless it is parallel to the static magnetic field. The x-ray source of the invention contains elements used to steer the electron beam and increase its focusing on the anode. The beam can be steered electrostatically, electromagnetically, or by adding magnetic material to the x-ray source. In the resulting system, MR and x-ray images are acquired without moving the object, which is particularly useful for image-guided medical intervention procedures.
摘要翻译：成像系统和方法结合磁共振成像（MRI）系统和x射线透视系统，使得两个系统具有重合的视场。 X射线由固定的阳极x射线管产生，其中电子束从阴极加速到阳极。在MRI系统的静磁场的存在下，电子束被偏转，除非它与静磁场平行。本发明的X射线源包含用于引导电子束并增加其在阳极上聚焦的元件。光束可以静电，电磁学或通过向x射线源添加磁性材料。在所得到的系统中，获取MR和X射线图像而不移动物体，这对于图像引导的医疗干预程序特别有用。

6. 发明授权

US6066949A Gradient characterization using fourier-transform 失效
标题翻译：梯度表征使用傅里叶变换
公开(公告)号：US6066949A
公开(公告)日：2000-05-23
申请号：US974582
申请日：1997-11-19
申请人： Marcus T. Alley , Norbert J. Pelc
发明人： Marcus T. Alley , Norbert J. Pelc
IPC分类号： G01R33/385 , G01R33/58 , G01V3/00
CPC分类号： G01R33/385 , G01R33/583
摘要： Disclosed is a method for characterizing the gradient subsystem of a Magnetic Resonance (MR) system. The method uses a Fourier-transform analysis to directly measure the k-space trajectory produced by an arbitrary gradient waveform. In addition, the method can be easily extended to multiple dimensions, and can be adapted to measuring residual gradient effects such as eddy currents. Several examples of gradient waveform and eddy-current measurements are presented. Also, it is demonstrated how the eddy-current measurements are presented. Also, it is demonstrated how the eddy-current measurements can be parameterized with an impulse-response formalism for later use in system tuning. When compared to a peak-fitting analysis, this technique provides a more direct extraction of the k-space measurements, which reduces the possibility of analysis error. This approach also has several advantages as compared to the conventional eddy-current measurement technique, including the ability to measure very short time constant effects.
摘要翻译：公开了用于表征磁共振（MR）系统的梯度子系统的方法。该方法使用傅立叶变换分析直接测量由任意梯度波形产生的k空间轨迹。此外，该方法可以容易地扩展到多个维度，并且可以适用于测量残余梯度效应，例如涡流。提出了梯度波形和涡流测量的几个例子。此外，还演示了如何呈现涡流测量。此外，还演示了如何用脉冲响应形式来对涡流测量进行参数化，以供以后在系统调谐中使用。与峰值拟合分析相比，该技术提供了更直接的k空间测量提取，从而降低了分析误差的可能性。与传统的涡流测量技术相比，该方法还具有几个优点，包括测量非常短的时间常数效应的能力。

7. 发明授权

US5559847A Systems, methods and apparatus for reconstructing images in a CT system implementing a helical scan 失效
标题翻译：用于在实施螺旋扫描的CT系统中重建图像的系统，方法和装置
公开(公告)号：US5559847A
公开(公告)日：1996-09-24
申请号：US567922
申请日：1995-12-06
申请人： Hui Hu , Norbert J. Pelc
发明人： Hui Hu , Norbert J. Pelc
IPC分类号： A61B6/03 , G06T1/00 , G06T11/00
CPC分类号： G06T11/006 , A61B6/027 , G06T2211/421
摘要： The present invention, in one form, is an apparatus for performing image reconstruction using data obtained by a four beam helical scan. In reconstructing an image, projection data arrays are generated. Such projection data is then weighted by weighting factors to generate a weighted projection data array. The weighted projection data array is filtered and back projected to generate an image data array. The image data arrays for the beams are then summed to generate a slice image data array.
摘要翻译：本发明的一种形式是使用通过四波束螺旋扫描获得的数据进行图像重建的装置。在重建图像时，生成投影数据阵列。然后通过加权因子对这样的投影数据进行加权，以生成加权投影数据阵列。加权投影数据阵列被过滤和反投影以产生图像数据阵列。然后将用于波束的图像数据阵列相加以生成切片图像数据阵列。

8. 发明授权

US5309100A Flow measurement of incompressible fluid using divergence-free constraint 失效
标题翻译：不可压缩流体的流量测量使用无差异约束
公开(公告)号：US5309100A
公开(公告)日：1994-05-03
申请号：US968754
申请日：1992-10-30
申请人： Samuel M. Song , Sandy A. Napel , Norbert J. Pelc
发明人： Samuel M. Song , Sandy A. Napel , Norbert J. Pelc
IPC分类号： G01F1/716 , G01P5/00 , G01R33/56 , G01R33/563 , G01R33/20
CPC分类号： G01R33/56316 , G01F1/716 , G01P5/001
摘要： A method and apparatus to reduce the noise in three-dimensional phase contrast magnetic resonance velocity measurements exploits the property that blood is incompressible and therefore the velocity field describing its flow must be divergence-free. The divergence-free condition can be incorporated by the projection operation on Hilbert space where the velocity measurements are projected onto the space of divergence-free velocity fields. The reduction of noise is achieved since the projection operation eliminates the noise component that is not divergence-free. Higher quality angiograms are produced due to the noise reduction in the velocity measurement signals.
摘要翻译：降低三维相位对比磁共振速度测量中的噪声的方法和装置利用血液不可压缩的特性，因此描述其流动的速度场必须是无差异的。通过在希尔伯特（Hilbert）空间上的投影操作可以将无差异条件并入，其中速度测量被投影到无发散速度场的空间上。实现了噪声的降低，因为投影操作消除了不分散的噪声分量。由于速度测量信号中的噪声降低，产生了较高质量的血管造影。

9. 发明授权

US5253282A System for selective material imaging 失效
标题翻译：选择性材料成像系统
公开(公告)号：US5253282A
公开(公告)日：1993-10-12
申请号：US874146
申请日：1992-04-27
申请人： Norbert J. Pelc
发明人： Norbert J. Pelc
IPC分类号： A61B6/00 , H05G1/60 , H05G1/64
CPC分类号： A61B6/505 , A61B6/4035 , A61B6/482 , H05G1/60
摘要： A dual energy x-ray system for determining bone density and the like compensates for variable flux density associated with the different absorptions and the production of the high and low energies of x-rays by controlling both the voltage biasing the x-ray tube and the relative dwell times during which the x-ray tube is at those voltages, the dwell time being increased for the lower voltage to compensate for lower flux density. Compensation for variations in flux density improves the resultant signal-to-noise ratio of the measurements taken and thereby provides more accurate measurement of materials with minimized examination time.
摘要翻译：用于确定骨密度等的双能X射线系统通过控制偏压x射线管的电压和对X射线管的偏压来补偿与不同吸收和X射线的高能量和低能量的产生相关联的可变磁通密度 x射线管处于那些电压的相对停留时间，为了较低的电压补偿较低的通量密度，停留时间增加。通量密度变化的补偿提高了所得测量结果的信噪比，从而提供了更精确的材料测量，同时尽可能减少了检测时间。

10. 发明授权

US5226418A Phase correction of complex - difference processed magnetic resonance angiograms 失效
标题翻译：复合相位校正磁共振分析
公开(公告)号：US5226418A
公开(公告)日：1993-07-13
申请号：US738765
申请日：1991-08-01
申请人： Matthew A. Bernstein , Norbert J. Pelc
发明人： Matthew A. Bernstein , Norbert J. Pelc
IPC分类号： F28D7/08 , A61B5/055 , F28D9/00 , G01P5/00 , G01P13/00 , G01R33/28 , G01R33/563 , G01R33/565
CPC分类号： F28D9/0037 , G01R33/563 , G01R33/565 , G01R33/56563
摘要： An NMR system produces an angiogram using the complex-difference method. Artifacts caused by system phase errors are reduced by calculating a corrected phase angle using the acquired NMR data sets and using the corrected phase angle in calculating the complex difference in the corresponding elements of the image domain NMR data sets.
摘要翻译： NMR系统使用复差法产生血管造影。通过使用所获取的NMR数据集计算校正的相位角并且在计算图像域NMR数据集的相应元素中的复差时使用校正的相位角来减少由系统相位误差引起的伪像。

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