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公开(公告)号：US20230081688A1
公开(公告)日：2023-03-16
申请号：US17944356
申请日：2022-09-14
摘要： A computer-implemented method for determining correct operation of a receiving system of a magnetic resonance device using of a magnetic resonance measurement, by: acquiring a magnetic resonance image using the receiving system during the magnetic resonance measurement, determining a noise distribution of the acquired magnetic resonance image by means of a computing unit, and determining correct operation of the receiving system by means of the computing unit on the basis of the noise distribution. Also, a magnetic resonance device, having a computing unit which is designed to coordinate the computer-implemented method and execute the by means of the magnetic resonance device.
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公开(公告)号：US20180137248A1
公开(公告)日：2018-05-17
申请号：US15814858
申请日：2017-11-16
CPC分类号： G16H40/20 , G06K9/00993 , G06K9/20 , G06K9/6226 , G06K2209/05 , G06Q10/06311 , G16H50/70
摘要： In a method and computer for creating a usage schedule during a usage phase of an image acquisition apparatus, time slots of the usage phase are assigned to examinations of a patient that use at least one measurement protocol. The scheduling is performed using examination durations associated with the examinations based on at least one examination parameter specifying the examination and/or at least one patient parameter specifying the patient, as input data, determined by an analysis algorithm using operating data that are recorded during the operation of the image acquisition apparatus and/or an image acquisition apparatus allocated to a group of image acquisition apparatuses of the same imaging modality.
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3.发明授权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：US09569843B1
公开(公告)日：2017-02-14
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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公开(公告)号：US20220245817A1
公开(公告)日：2022-08-04
申请号：US17648686
申请日：2022-01-24
IPC分类号： G06T7/00 , G06V10/774 , G06V10/82 , G06V10/36 , G06V10/75
摘要： A computer implemented method of processing a medical image is disclosed. The method includes receiving a medical image comprising a first plurality of pixels each having an initial pixel value. For each of the first plurality of pixels, a filtering operation is applied to the pixel to generate a filtered pixel value for the pixel based on the initial pixel values of pixels that surround the pixel in the medical image. For each of the first plurality of pixels, a comparison of the initial pixel value with the filtered pixel value is performed. The method comprises, for each of the first plurality of pixels, determining, based on the comparison, whether or not to categorize the pixel as an erroneous pixel; and for each of the first plurality of pixels for which it is determined to categorize the pixel as an erroneous pixel, categorizing the pixel as an erroneous pixel.
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公开(公告)号：US11333734B2
公开(公告)日：2022-05-17
申请号：US16868848
申请日：2020-05-07
发明人： Xiaodong Zhong , Vibhas S. Deshpande , Marcel Dominik Nickel , Xiaoming Bi , Stephan Kannengiesser , Berthold Kiefer
IPC分类号： G01R33/567 , G01R33/56 , G06T11/00 , G06T7/00 , G06T3/00
摘要： A method of generating biomarker parameters includes acquiring imaging data depicting a patient using a MRI system. The imaging data is acquired for a plurality of contrasts resulting from application of a pulse on the patient's anatomy. A process is executed to generate a MoCoAve image for each contrast. This process includes dividing the imaging data for the contrast into bins corresponding to one of a plurality of respiratory motion phases, and reconstructing the imaging data in each bin to yield bin images. The process further includes selecting a reference bin image from the bin images, and warping the bin images based on the reference bin image. The warped bin images and the reference bin image are averaged to generate the MoCoAve image for the contrast. One or more biomarker parameter maps are calculated based on the MoCoAve images generated for the contrasts.
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公开(公告)号：US20220128641A1
公开(公告)日：2022-04-28
申请号：US17491553
申请日：2021-10-01
发明人： Xiaodong Zhong , Holden H. Wu , Vibhas S. Deshpande , Tess Armstrong , Li Pan , Marcel Dominik Nickel , Stephan Kannengiesser
IPC分类号： G01R33/565 , G01R33/48 , G01R33/483 , G01R33/567
摘要： A method for acquiring magnetic resonance imaging data with respiratory motion compensation using one or more motion signals includes acquiring a plurality of gradient-delay-corrected radial readout views of a subject using a free-breathing multi-echo pulse sequence, and sampling a plurality of data points of the gradient-delay-corrected radial readout views to yield a self-gating signal. The self-gating signal is used to determine a plurality of respiratory motion states corresponding to the plurality of gradient-delay-corrected radial readout views. The respiratory motion states are used to correct respiratory motion bias in the gradient-delay-corrected radial readout views, thereby yielding gradient-delay-corrected and motion-compensated multi-echo data. One or more images are reconstructed using the gradient-delay-corrected and motion-compensated multi-echo data.
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7.发明授权公开(公告)号：US10436867B2
公开(公告)日：2019-10-08
申请号：US15613563
申请日：2017-06-05
IPC分类号： G01R33/50 , G01R33/341 , G01R33/483 , G01R33/56 , A61B5/055 , A61B5/00
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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公开(公告)号：US10083505B2
公开(公告)日：2018-09-25
申请号：US15613522
申请日：2017-06-05
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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公开(公告)号：US20220317219A1
公开(公告)日：2022-10-06
申请号：US17711335
申请日：2022-04-01
IPC分类号： G01R33/563 , G01R33/56 , G01R33/561
摘要： The present disclosure generally relate to a method and system for performing three-dimensional, 3D, magnetic resonance elastography, MRE. In particular, the present disclosure relates to a method and system for imaging an area of a patient using a multi-slice gradient echo, GRE, imaging sequence. Advantageously, the present techniques enable the four scans that are typically required to be performed during MRE, and during four breath-holds, to be combined into a single measurement that can be performed during a single breath-hold.
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公开(公告)号：US20220308146A1
公开(公告)日：2022-09-29
申请号：US17679422
申请日：2022-02-24
IPC分类号： G01R33/565 , G01R33/54 , G01R33/483
摘要： Methods and systems are provided for identifying radio frequency (RF) interference without an RF room during imaging in a magnetic resonance tomography system. The method includes performing an acquisition, wherein scanning of a k-space along a trajectory takes place and an angle of rotation α exists between a scan start position of a first individual acquisition and a scan start position of a following second individual acquisition. A first image is obtained from the first individual acquisition and a second image is obtained from the second individual acquisition. One of the two images is rotated in respect of the other image about the angle of rotation α. A correlation is determined between the one rotated image and the other image, and a point of interference is identified from the correlation.
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