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1. 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。

2. 发明申请

US20080164875A1 EXCLUSION OF COMPROMISED PET DATA DURING SIMULTANEOUS PET-MR ACQUISITION 有权
标题翻译：同时PET-MR获取期间排除PET数据
公开(公告)号：US20080164875A1
公开(公告)日：2008-07-10
申请号：US11621622
申请日：2007-01-10
申请人： Robert H. Haworth , Steven G. Ross , Charles W. Stearns , Jason A. Polzin , Alexander Ganin
发明人： Robert H. Haworth , Steven G. Ross , Charles W. Stearns , Jason A. Polzin , Alexander Ganin
IPC分类号： G01T1/161 , G01R33/48
CPC分类号： G01R33/481 , G01R33/28 , G01T1/1603
摘要： A system and method for simultaneously acquiring PET and MR data from a subject of interest with a hybrid PET-MR scanner includes monitoring transmission times of RF and gradient coils of the MR equipment and blanking segments of the PET data stream accordingly. By excluding PET data acquired during active MR transmissions, the remaining PET data used for image reconstruction will provide improved PET image quality.
摘要翻译：利用混合PET-MR扫描仪同时从感兴趣的对象采集PET和MR数据的系统和方法包括相应地监测MR设备的RF设备和梯形线圈的传输时间以及PET数据流的消隐段。通过排除在有源MR传输期间获取的PET数据，用于图像重建的剩余PET数据将提供改进的PET图像质量。

3. 发明授权

US6166545A MRI reconstruction using partial echo and partial NEX data acquisitions 失效
标题翻译：使用部分回波和部分NEX数据采集进行MRI重建
公开(公告)号：US6166545A
公开(公告)日：2000-12-26
申请号：US219129
申请日：1998-12-22
申请人： Jason A. Polzin , Matthew A. Bernstein , Thomas K. F. Foo
发明人： Jason A. Polzin , Matthew A. Bernstein , Thomas K. F. Foo
IPC分类号： G01R33/561 , G01V3/00
CPC分类号： G01R33/561
摘要： A system and method is disclosed to combine both a fractional echo (k.sub.x) and a fractional NEX (k.sub.y) to reduce acquisition times and echo times in MR imaging. The method uses both zero-filling and homodyne reconstruction to construct concurrent fractional NEX and fractional echo data in a single image while minimizing any blurring effects. The system includes acquiring partial MRI data in the k.sub.x direction and acquiring partial MRI data in the k.sub.y direction. Once a partial echo and a partial NEX are acquired, the missing data is first zero-filled in the k.sub.x direction and Fourier transformed to acquire a full x direction data set. Next, the data is synthesized in the k.sub.y direction using a homodyne reconstruction technique to acquire a full data set in the k.sub.y direction. The full x,y data set can then be used to reconstruct an MR image with reduced acquisition and echo times. In order to minimize the effects of blurring in the resulting MR image, it is preferable to acquire at least an 80% fractional echo and a 60% fractional NEX. The system can be extended to any number of desirable dimensions.
摘要翻译：公开了将分数回波（kx）和分数NEX（ky）组合以减少MR成像中的采集时间和回波时间的系统和方法。该方法使用零填充和零差重建来构建单个图像中的并发分数NEX和分数回波数据，同时最小化任何模糊效果。该系统包括以kx方向获取部分MRI数据并且获取ky方向上的部分MRI数据。一旦获得了部分回波和部分NEX，则丢失的数据首先在kx方向上零填充，并进行傅里叶变换以获取全x方向数据集。接下来，使用零差重建技术以ky方向合成数据，以获取ky方向上的完整数据集。然后可以使用完整的x，y数据集来重建具有减少的采集和回波时间的MR图像。为了最小化所得MR图像中模糊的影响，优选获得至少80％的分数回波和60％的分数NEX。该系统可以扩展到任何数量的所需尺寸。

4. 发明授权

US07847552B2 Exclusion of compromised PET data during simultaneous PET-MR acquisition 有权
标题翻译：同时PET-MR采集期间排除了妥协的PET数据
公开(公告)号：US07847552B2
公开(公告)日：2010-12-07
申请号：US11621622
申请日：2007-01-10
申请人： Robert H. Haworth , Steven G. Ross , Charles W. Stearns , Jason A. Polzin , Alexander Ganin
发明人： Robert H. Haworth , Steven G. Ross , Charles W. Stearns , Jason A. Polzin , Alexander Ganin
IPC分类号： G01V3/00
CPC分类号： G01R33/481 , G01R33/28 , G01T1/1603
摘要： A system and method for simultaneously acquiring PET and MR data from a subject of interest with a hybrid PET-MR scanner includes monitoring transmission times of RF and gradient coils of the MR equipment and blanking segments of the PET data stream accordingly. By excluding PET data acquired during active MR transmissions, the remaining PET data used for image reconstruction will provide improved PET image quality.
摘要翻译：利用混合PET-MR扫描仪同时从感兴趣的对象采集PET和MR数据的系统和方法包括相应地监测MR设备的RF设备和梯形线圈的传输时间以及PET数据流的消隐段。通过排除在有源MR传输期间获取的PET数据，用于图像重建的剩余PET数据将提供改进的PET图像质量。

5. 发明授权

US6163152A Method and system for correcting errors in MR images due to regions of gradient non-uniformity for parametric imaging such as quantitative flow analysis 失效
标题翻译：用于校正由于参数成像的梯度不均匀性区域（如定量流量分析）导致的MR图像误差的方法和系统
公开(公告)号：US6163152A
公开(公告)日：2000-12-19
申请号：US97525
申请日：1998-06-15
申请人： Matthew A. Bernstein , Jason A. Polzin
发明人： Matthew A. Bernstein , Jason A. Polzin
IPC分类号： A61B5/055 , G01R33/54 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56518
摘要： A system and method for correcting systematic errors that occur in MR images due to magnetic gradient non-uniformity is disclosed for use with parametric analysis. A GradWarp geometric correction operation is applied in reconstructing quantitative parametric analysis images in regions of gradient non-uniformity. The method includes generating an error map of magnetic gradient strength as a function of distance for an MR image scan and acquiring MR data that contain such systematic errors. The method next includes either calculating a measured diffusion image, a phase difference image, or similar image, based on the acquired MR data, and then calculating a corrected parametric image using the error map and the measured diffusion image, the phase difference image, or other similar parametric image. The method is incorporated into a system having a computer programmed to perform the aforementioned steps and functions.
摘要翻译：公开了一种用于校正由于磁梯度不均匀性而在MR图像中发生的系统误差的系统和方法，用于参数分析。应用GradWarp几何校正操作重建梯度不均匀区域的定量参数分析图像。该方法包括产生磁梯度强度的误差图，作为MR图像扫描的距离的函数，并获取包含这种系统误差的MR数据。该方法接下来包括基于获取的MR数据计算测量的漫射图像，相位差图像或类似图像，然后使用误差图和测量的漫射图像，相位差图像或其他类似的参数图像。该方法被并入具有被编程为执行上述步骤和功能的计算机的系统中。

6. 发明授权

US06339626B1 MRI system with fractional decimation of acquired data 失效
$MRI system with fractional decimation of acquired data$
标题翻译： MRI系统采用抽样数据进行抽样
公开(公告)号：US06339626B1
公开(公告)日：2002-01-15
申请号：US09039436
申请日：1998-03-16
申请人： Matthew A. Bernstein , Jason A. Polzin , Bo J. Petersson , Frederick J. Frigo
发明人： Matthew A. Bernstein , Jason A. Polzin , Bo J. Petersson , Frederick J. Frigo
IPC分类号： H04L700
CPC分类号： G01R33/56
摘要： An MRI system acquires NMR signals and digitizes them at a fixed sample rate. A lower, prescribed sample rate is obtained by fractionally decimating the sampled NMR signals. Fractional decimation is achieved by a combination of zeropadding the sampled NMR signal in the frequency domain and decimating the sampled NMR signal in the time domain.
摘要翻译： MRI系统获取NMR信号并以固定的采样率数字化。通过对采样的NMR信号进行分数抽取，获得较低的规定采样率。通过在频域中加样采样的NMR信号并在时域中抽取采样的NMR信号来组合分数抽取。

7. 发明授权

US06064205A Correction of artifacts caused by maxwell terms in slice offset echo planar imaging 有权
标题翻译：校正由切片偏移回波平面成像中的maxwell项引起的假象
公开(公告)号：US06064205A
公开(公告)日：2000-05-16
申请号：US265259
申请日：1999-03-09
申请人： Xiaohong Zhou , Yiping Du , Matthew A. Bernstein , Hammond G. Reynolds , Joseph K. Maier , Jason A. Polzin
发明人： Xiaohong Zhou , Yiping Du , Matthew A. Bernstein , Hammond G. Reynolds , Joseph K. Maier , Jason A. Polzin
IPC分类号： G01R33/32 , A61B5/055 , G01R33/54 , G01R33/561 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56581 , G01R33/56554
摘要： Two methods are disclosed to remove the image artifacts produced by Maxwell terms arising from the imaging gradients in an echo planar imaging pulse sequence. In the first method, the frequency and phase errors caused by the Maxwell terms are calculated on an individual slice basis and subsequently compensated during data acquisition by dynamically adjusting the receiver frequency and phase. In the second method, two linear phase errors, one in the readout direction and the other in the phase-encoding direction, both of which arise from the Maxwell terms, are calculated on an individual-slice basis. These errors are compensated for in the k-space data after data acquisition.
摘要翻译：公开了两种方法来去除由回波平面成像脉冲序列中的成像梯度引起的由麦克斯韦尔产生的图像伪影。在第一种方法中，由麦克斯韦尔项引起的频率和相位误差在单独的切片基础上计算，并随后通过动态调整接收机频率和相位在数据采集期间进行补偿。在第二种方法中，以单个切片为基础计算两个线性相位误差，一个在读出方向上，另一个在相位编码方向上，两个来自麦克斯韦术语。这些误差在数据采集后的k空间数据中得到补偿。

8. 发明授权

US5923168A Correction of artifacts caused by Maxwell terms in slice offset echo planar imaging 失效
标题翻译：由切片偏移回波平面成像中的麦克斯韦术语引起的伪像的校正
公开(公告)号：US5923168A
公开(公告)日：1999-07-13
申请号：US877384
申请日：1997-06-17
申请人： Xiaohong Zhou , Yiping Du , Matthew A. Bernstein , Hammond G. Reynolds , Joseph K. Maier , Jason A. Polzin
发明人： Xiaohong Zhou , Yiping Du , Matthew A. Bernstein , Hammond G. Reynolds , Joseph K. Maier , Jason A. Polzin
IPC分类号： G01R33/32 , A61B5/055 , G01R33/54 , G01R33/561 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56581 , G01R33/56554
摘要： A method is disclosed to remove the image artifacts produced by Maxwell terms arising from the imaging gradients in an echo planar imaging pulse sequence. The frequency and phase errors caused by the Maxwell terms are calculated on an individual slice basis. During the subsequent data acquisition these errors are compensated by dynamically adjusting the receiver frequency and phase.
摘要翻译：公开了一种消除由回波平面成像脉冲序列中的成像梯度产生的麦克斯韦术语产生的图像伪影的方法。由麦克斯韦条款引起的频率和相位误差是在单独的切片基础上计算的。在随后的数据采集过程中，通过动态调整接收机频率和相位来补偿这些误差。

9. 发明授权

US07064547B1 Method and apparatus of M/r imaging with coil calibration data acquisition 失效
标题翻译：用线圈校准数据采集M / r成像的方法和装置
公开(公告)号：US07064547B1
公开(公告)日：2006-06-20
申请号：US10710133
申请日：2004-06-21
申请人： Kevin F. King , Elisabeth Angelos , Jason A. Polzin
发明人： Kevin F. King , Elisabeth Angelos , Jason A. Polzin
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： A system and method for MR imaging with coil sensitivity or calibration data acquisition for reducing wrapping or aliasing artifacts is disclosed. Low resolution MR data representative of coil sensitivity of a coil arrangement within an FOV is acquired prior to application of an imaging data acquisition scan and is used to reduce wrapping or aliasing artifacts in a reconstructed image.
摘要翻译：公开了一种用于减少包装或混叠伪像的线圈灵敏度或校准数据采集的MR成像系统和方法。在施加成像数据采集扫描之前获取表示FOV内的线圈装置的线圈灵敏度的低分辨率MR数据，并用于减少重建图像中的包裹或混叠伪影。

10. 发明授权

US07558613B2 Spatial encoding MR data of a moving subject using a higher-order gradient field 有权
标题翻译：使用较高阶梯度场的移动物体的空间编码MR数据
公开(公告)号：US07558613B2
公开(公告)日：2009-07-07
申请号：US11163024
申请日：2005-10-03
申请人： Richard Scott Hinks , Kevin F. King , Jason A. Polzin
发明人： Richard Scott Hinks , Kevin F. King , Jason A. Polzin
IPC分类号： A61B5/05 , G01V3/00
CPC分类号： G01R33/56375 , G01R33/385
摘要： The present invention includes a technique for use with magnetic resonance imaging that includes the application of a non-linear, higher-order gradient field in the presence of a moving object to be scanned. MR data is acquired as the object moves through the non-linear gradient field. Resulting images are contiguous and do not require the patching together of data in either k-space or image space and result in an image with expanded FOV in a longitudinal direction of the moving object.
摘要翻译：本发明包括一种用于磁共振成像的技术，其包括在存在待扫描的移动物体的情况下应用非线性，高阶梯度场。随着对象移动通过非线性梯度域，获取MR数据。所得到的图像是连续的，并且不需要在k空间或图像空间中将数据进行修补，并导致在移动物体的纵向方向上具有扩展的FOV的图像。

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