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1.发明授权
公开(公告)号：US5498963A
公开(公告)日：1996-03-12
申请号：US286365
申请日：1994-08-05
IPC分类号： G01R33/565 , G01V3/14
CPC分类号： G01R33/56518
摘要： In an MRI system NMR data is acquired and an image is reconstructed based on the net phase or phase difference of spins at locations in the imaged object. The phase or phase difference image is corrected for errors caused by non-linearities in one or more of the gradient fields. The phase or phase difference image values are weighted with spin signal magnitude image values and their locations warped to reflect gradient field non-linearity. The warped values are remapped to the image pixel locations and converted back to phase values by dividing by an average spin signal magnitude. In this manner geometric distortion caused by non-uniform magnetic field gradients are corrected without loss of quantitative phase or phase difference information.
摘要翻译： 在MRI系统中，获取NMR数据，并且基于成像对象中位置处的自旋的净相位或相位差重建图像。 针对由一个或多个梯度场中的非线性引起的误差来校正相位差或相位差图像。 相位或相位差图像值用自旋信号幅度图像值加权，并且它们的位置翘曲以反映梯度场非线性。 翘曲值被重新映射到图像像素位置，并通过除以平均自旋信号幅度而转换回相位值。 以这种方式，校正由不均匀磁场梯度引起的几何失真，而不损失定量相位或相位差信息。
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公开(公告)号：US07382127B2
公开(公告)日：2008-06-03
申请号：US11532511
申请日：2006-09-15
IPC分类号： G01V3/00
CPC分类号： G01R33/5611 , G01R33/4824
摘要： A system and method of MR imaging enables PROPELLER imaging to be feasibly carried out independently of slice orientation or anatomy of interest. The invention is directed to accelerated acquisition of blades of MR data that are rotated about a central region of k-space and reconstructing an image of arbitrary slice orientation from the blades of MR data that preserves contrast and reduces acceleration artifacts caused by signal amplitude variances.
摘要翻译： MR成像的系统和方法使得PROPELLER成像可以独立于切片方向或感兴趣的解剖结构被可行地进行。 本发明涉及加速获取围绕k空间的中心区域旋转的MR数据的叶片，并且重建来自MR数据的叶片的任意切片取向的图像，其保留对比度并减少由信号幅度方差引起的加速度伪影。
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3.发明授权公开(公告)号：US06603992B1
公开(公告)日：2003-08-05
申请号：US09691691
申请日：2000-10-18
IPC分类号： A61B5055
CPC分类号： G01R33/5601 , G01R33/4822
摘要： A method of synchronizing initiation of a magnetic resonance image (MRI) acquisition to the arrival of a contrast agent in a structure of interest, such as an artery, includes repeatedly performing a first MRI scan until the first MRI scan indicates that the contrast agent has arrived. The first MRI scan acquires a three-dimensional MRI data set from the structure of interest. Preferably, the first MRI scan is a partial MRI scan that produces a low resolution image. Once the first MRI scan indicates that the contrast agent has arrived in the structure of interest, a second MRI scan is performed that acquires a second three-dimensional MRI data set from the structure of interest. The second MRI scan is preferably a full MRI scan that produces a full fidelity image. The manner of data acquisition is advantageously the same for both the first MRI scan and the second MRI scan.
摘要翻译： 将磁共振图像（MRI）采集同步到感兴趣的结构（例如动脉）中的造影剂的到达的方法包括重复进行第一次MRI扫描，直到第一次MRI扫描指示造影剂具有 到了 第一次MRI扫描从感兴趣的结构获取三维MRI数据集。 优选地，第一MRI扫描是产生低分辨率图像的部分MRI扫描。 一旦第一次MRI扫描表明造影剂已经到达感兴趣的结构，则执行从感兴趣的结构获得第二个三维MRI数据集的第二次MRI扫描。 第二次MRI扫描优选是产生完全保真度图像的完整MRI扫描。 对于第一MRI扫描和第二次MRI扫描，数据采集的方式有利地是相同的。
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4.发明授权公开(公告)号：US07023207B1
公开(公告)日：2006-04-04
申请号：US10906367
申请日：2005-02-16
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/561 , G01R33/56545
摘要： A method and system of MR imaging is disclosed that enables PROPELLER imaging to be feasibly carried out independently of slice orientation or anatomy of interest. The invention is directed to the acquisition of blades of MR data that are rotated about a central region of k-space and reconstructing an image of arbitrary slice orientation from the blades of MR data that is substantially absent of radial ripple artifacts caused by phase aliasing from tissue outside the field of view in the slice plane.
摘要翻译： 公开了MR成像的方法和系统，其使得能够独立于感兴趣的切片方向或解剖结构可行地执行PROPELLER成像。 本发明涉及采集围绕k空间的中心区域旋转的MR数据的叶片，并从MR数据的叶片重构任意切片取向的图像，其基本上不存在由相位混叠引起的径向纹波伪影 在切片平面内的视场外的组织。
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公开(公告)号：US20080068016A1
公开(公告)日：2008-03-20
申请号：US11532511
申请日：2006-09-15
IPC分类号： G01V3/00
CPC分类号： G01R33/5611 , G01R33/4824
摘要： A system and method of MR imaging enables PROPELLER imaging to be feasibly carried out independently of slice orientation or anatomy of interest. The invention is directed to accelerated acquisition of blades of MR data that are rotated about a central region of k-space and reconstructing an image of arbitrary slice orientation from the blades of MR data that preserves contrast and reduces acceleration artifacts caused by signal amplitude variances.
摘要翻译： MR成像的系统和方法使得PROPELLER成像可以独立于切片方向或感兴趣的解剖结构被可行地进行。 本发明涉及加速获取围绕k空间的中心区域旋转的MR数据的叶片，并且重建来自MR数据的叶片的任意切片取向的图像，其保留对比度并减少由信号幅度方差引起的加速度伪影。
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公开(公告)号：US07336073B2
公开(公告)日：2008-02-26
申请号：US11559558
申请日：2006-11-14
IPC分类号： G01V3/00
CPC分类号： G01R33/561
摘要： The present invention is directed to a method of MR imaging whereby a k-space blade extending through a center of k-space from a subject in motion is acquired. A high-pass convolution of the k-space blade with a reference k-space blade is then determined and converted to a δ function. In-plane motion of the subject during data acquisition of the k-space is then determined from the δ function.
摘要翻译： 本发明涉及一种MR成像方法，其中获取从运动中的被摄体延伸穿过k空间的中心的k空间刀片。 然后确定k空间刀片与参考k空间刀片的高通卷积并转换为增量函数。 然后，从delta函数确定在k空间的数据采集期间的对象的平面内运动。
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公开(公告)号：US07176684B2
公开(公告)日：2007-02-13
申请号：US11170054
申请日：2005-06-29
IPC分类号： G01V3/00
CPC分类号： G01R33/561
摘要： The present invention is directed to a method of MR imaging whereby a k-space blade extending through a center of k-space from a subject in motion is acquired. A high-pass convolution of the k-space blade with a reference k-space blade is then determined and converted to a δ function. In-plane motion of the subject during data acquisition of the k-space is then determined from the δ function.
摘要翻译： 本发明涉及一种MR成像方法，其中获取从运动中的被摄体延伸穿过k空间的中心的k空间刀片。 然后确定k空间刀片与参考k空间刀片的高通卷积并转换为增量函数。 然后，从delta函数确定在k空间的数据采集期间的对象的平面内运动。
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8.发明授权Method for controlling data acquisition and image reconstruction during continuous MR imaging 失效在连续MR成像期间控制数据采集和图像重建的方法
公开(公告)号：US6097977A
公开(公告)日：2000-08-01
申请号：US1900
申请日：1997-12-31
IPC分类号： A61B5/055
CPC分类号： A61B5/055 , Y10S128/922
摘要： An MRI system performs a real-time scan in which image frames are produced as the image is moved to different locations in the patient. The location at which each set of image data is acquired is compared, and image data acquired at the same location are combined to improve image quality. An autonex feature enables averaging of successive image data acquisitions and a frame rate feature enables combining of partial NEX acquisitions.
摘要翻译： MRI系统执行实时扫描，其中当图像移动到患者中的不同位置时，产生图像帧。 比较获取每组图像数据的位置，并且将在相同位置获取的图像数据组合以提高图像质量。 自动特征功能使得能够对连续的图像数据采集进行平均，并且帧速率特征使得能够组合部分NEX采集。
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公开(公告)号：US06564081B1
公开(公告)日：2003-05-13
申请号：US09682913
申请日：2001-10-31
IPC分类号： A61B5055
CPC分类号： G01R33/3621
摘要： The present invention provides a system and method of increasing the sampling rate for MR data acquisition. By implementing ensemble sampling techniques, the present invention provides higher data sampling rates that are useful for several MR data acquisition applications including Echo Planar Imaging, Functional Magnetic Resonance Imaging, and Sensitivity Encoding Imaging (SENSE) techniques. By multiplying an MR signal by a series of pure sinusoids having the same frequency but shifted by an incremental phase, the MR signal may be separated into a number of channels which can be sampled at lower rates by analog-to-digital converters. The output from the converters may then be reconstructed using one of a number of interpolation techniques to create a single digital channel with increased bandwidth. The single channel with increased bandwidth may then be used to acquire MR data with an improved sampling rate.
摘要翻译： 本发明提供了增加MR数据采集采样率的系统和方法。 通过实施集成采样技术，本发明提供了对于几个MR数据采集应用（包括回波平面成像，功能磁共振成像和灵敏度编码成像（SENSE）技术）有用的较高数据采样率。 通过将MR信号乘以具有相同频率但偏移增量相位的一系列纯正弦曲线，MR信号可以被分离成多个通道，其可以由模数转换器以较低速率进行采样。 然后可以使用多个内插技术中的一个来重建来自转换器的输出，以创建具有增加的带宽的单个数字信道。 带宽增加的单通道随后可用于以改进的采样率采集MR数据。
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