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公开(公告)号：US10031203B2
公开(公告)日：2018-07-24
申请号：US15411118
申请日：2017-01-20
IPC分类号： G01V3/00 , G01R33/561 , G01R33/385 , G01R33/30 , G01R33/54
摘要： In a method and magnetic resonance (MR) apparatus for reconstruction of image data of an examination object from undersampled raw MR data and reference data, undersampled raw data are used that were recorded from an examination region of the examination object by an MR control sequence, to which a reconstruction algorithm for the reconstruction of image data is assigned. A disturbance variable in the examination region is determined. A modulation function is established, which describes the influence of the disturbance variable on the MR control sequence. Modulated reference data are created on the basis of the modulation function and the reference data such that the modulated reference data are subjected to the influence of the disturbance variable on the raw data recorded by the MR control sequence. A combination algorithm is executed in order to reconstruct image data from the undersampled raw data with the use of the modulated reference data.
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公开(公告)号：US20170352156A1
公开(公告)日：2017-12-07
申请号：US15613522
申请日：2017-06-05
IPC分类号： G06T7/00 , G01R33/34 , A61B6/00 , G01R33/483 , G06T7/136
CPC分类号： G06T7/0012 , A61B5/055 , A61B6/481 , G01R33/34092 , G01R33/4835 , G01R33/50 , G01R33/5601 , G01R33/5608 , G06T7/0014 , G06T7/0016 , G06T7/136 , G06T2207/10088 , G06T2207/30056
摘要： In a magnetic resonance method and apparatus for determination of a measurement variable that is relevant to a function of an organ of a patient, a first longitudinal relaxation rate R11 is determined before a contrast medium is administered to the patient. A second longitudinal relaxation rate R12 is determined after a contrast medium is administered to the patient. A property of the contrast medium in the organ is determined based on R11 and R12. The measurement variable is determined based on the property of the contrast medium in the organ.
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33.发明申请公开(公告)号：US20170350952A1
公开(公告)日：2017-12-07
申请号：US15613563
申请日：2017-06-05
IPC分类号： G01R33/50 , G01R33/341 , G01R33/483 , G01R33/56
CPC分类号： G01R33/50 , A61B5/055 , A61B5/4244 , G01R33/341 , G01R33/483 , G01R33/5608
摘要： In a computer and a magnetic resonance method and apparatus for automatic characterization (classification) of liver tissue in a region of interest of a liver, at least one value tuple of the region of interest of the liver is acquired, the value tuple including at least one T1 value determined from magnetic resonance images of the region of interest, or a reciprocal value thereof, and a T2 or T2* value or a reciprocal value thereof. The value tuple is transferred into a multidimensional parameter space and the characterization of the liver tissue is then performed on the basis of the position of the value tuple in the parameter space.
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34.发明申请Parameter-Free Denoising of Complex MR Images by Iterative Multi-Wavelet Thresholding 有权通过迭代多小波阈值对复杂MR图像进行无参数去噪公开(公告)号：US20170069082A1
公开(公告)日：2017-03-09
申请号：US14849391
申请日：2015-09-09
CPC分类号： G06T5/10 , G01R33/5608 , G01R33/5611 , G06T5/002 , G06T5/20 , G06T2207/10088
摘要： A method for denoising Magnetic Resonance Imaging (MRI) data includes receiving a noisy image acquired using an MRI imaging device and determining a noise model comprising a non-diagonal covariance matrix based on the noisy image and calibration characteristics of the MRI imaging device. The noisy image is designated as the current best image. Then, an iterative denoising process is performed to remove noise from the noisy image. Each iteration of the iterative denoising process comprises (i) applying a bank of heterogeneous denoisers to the current best image to generate a plurality of filter outputs, (ii) creating an image matrix comprising the noisy image, the current best image, and the plurality of filter outputs, (iii) finding a linear combination of elements of the image matrix which minimizes a Stein Unbiased Risk Estimation (SURE) value for the linear combination and the noise model, (iv) designating the linear combination as the current best image, and (v) updating each respective denoiser in the bank of heterogeneous denoisers based on the SURE value. Following the iterative denoising process, the current best image is designated as a final denoised image.
摘要翻译： 用于去噪磁共振成像（MRI）数据的方法包括接收使用MRI成像装置获取的噪声图像，并且基于噪声图像和MRI成像装置的校准特性来确定包括非对角协方差矩阵的噪声模型。 嘈杂的图像被指定为当前最佳图像。 然后，执行迭代去噪处理以从噪声图像中去除噪声。 迭代去噪过程的每次迭代包括（i）将一组异构去噪器应用于当前最佳图像以产生多个滤波器输出，（ii）创建包括噪声图像，当前最佳图像和多个滤波器输出的图像矩阵 的滤波器输出，（iii）找到使线性组合和噪声模型的斯坦因无偏差风险估计（SURE）值最小化的图像矩阵的元素的线性组合，（iv）将线性组合指定为当前最佳图像， 和（v）基于SURE值来更新异构去噪器组中的每个相应的去噪器。 在迭代去噪过程之后，将当前最佳图像指定为最终的去噪图像。
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35.发明申请METHOD AND APPARATUS FOR DETERMINING DEPHASING FACTORS IN MAGNETIC RESONANCE IMAGING AND SPECTROSCOPY 审中-公开用于确定磁共振成像和光谱学中潜在因素的方法和装置公开(公告)号：US20160334482A1
公开(公告)日：2016-11-17
申请号：US15154015
申请日：2016-05-13
IPC分类号： G01R33/46 , G01R33/561
CPC分类号： G01R33/46 , G01R33/4625 , G01R33/4828
摘要： In a method and apparatus for determining time-dependent dephasing factors of at least one spectral component of at least two spectral components in a region of interest in an object under examination, measured data of the region of interest and acquired over time by a test measurement in a magnetic resonance scanner. The contribution of at least one of the at least two spectral components in the recorded measured data is determined. Dephasing factors of the at least one spectral component are determined on the basis of the contribution determined therefor in the recorded measured data over time. Dephasing factors determined in this way can be determined individually with relatively little effort and used in Dixon techniques.
摘要翻译： 在用于确定被检查对象中感兴趣区域中的至少两个光谱分量的至少一个光谱分量的时间依赖去相位因子的方法和装置中，通过测试测量随时间获得的感兴趣区域的测量数据 在磁共振扫描仪中。 确定记录的测量数据中的至少两个光谱分量中的至少一个的贡献。 基于在记录的测量数据中随时间确定的贡献来确定至少一个频谱分量的相位因子。 以这种方式确定的倾向因素可以用相对较少的精力单独确定，并在Dixon技术中使用。
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