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公开(公告)号：US11209511B2
公开(公告)日：2021-12-28
申请号：US16420427
申请日：2019-05-23
摘要： Techniques are disclosed for providing a first magnetic resonance fingerprinting dictionary using fingerprints having a first length. A transformation matrix is also utilized that is configured to shorten the fingerprints to a second length that is shorter than the first length. A second magnetic resonance fingerprinting dictionary may then be obtained by multiplying the first magnetic resonance fingerprinting dictionary with the transformation matrix, with the fingerprints of the magnetic resonance fingerprinting dictionary having the second length. This facilitates the storage of a MRF dictionary that takes up less storage space and decreases the time taken to perform scanning operations.
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公开(公告)号：US20200319284A1
公开(公告)日：2020-10-08
申请号：US16830445
申请日：2020-03-26
IPC分类号： G01R33/565 , G01R33/483 , A61B5/055
摘要： The disclosure facilitates determining patient motion during a magnetic resonance protocol. According to some examples, the patient motion may be corrected or compensated.
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公开(公告)号：US20200042873A1
公开(公告)日：2020-02-06
申请号：US16394507
申请日：2019-04-25
发明人： Guillaume Daval Frerot , Xiao Chen , Simon Arberet , Boris Mailhe , Mariappan S. Nadar , Peter Speier , Mathias Nittka
摘要： For machine training and application of a trained complex-valued machine learning model, an activation function of the machine learning model, such as a neural network, includes a learnable parameter that is complex or defined in a complex domain with two dimensions, such as real and imaginary or magnitude and phase dimensions. The complex learnable parameter is trained for any of various applications, such as MR fingerprinting, other medical imaging, or non-medical uses.
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公开(公告)号：US20190383892A1
公开(公告)日：2019-12-19
申请号：US16441383
申请日：2019-06-14
IPC分类号： G01R33/48 , G01R33/561 , G01R33/56 , G06T11/00 , G06T7/00
摘要： In a magnetic resonance fingerprinting method and apparatus for improved determination of local parameter values of an examination object, in which at least two signal comparisons of acquired picture element time series are carried out with comparison signal curves for determination of parameter values. A further (subsequent) signal comparison takes into account results of a preceding signal comparison. This multi-stage determination of parameter values allows an increase of the spatial resolution and the precision with which the parameter values can be determined.
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公开(公告)号：US11580381B2
公开(公告)日：2023-02-14
申请号：US16394507
申请日：2019-04-25
发明人： Guillaume Daval Frerot , Xiao Chen , Simon Arberet , Boris Mailhe , Mariappan S. Nadar , Peter Speier , Mathias Nittka
摘要： For machine training and application of a trained complex-valued machine learning model, an activation function of the machine learning model, such as a neural network, includes a learnable parameter that is complex or defined in a complex domain with two dimensions, such as real and imaginary or magnitude and phase dimensions. The complex learnable parameter is trained for any of various applications, such as MR fingerprinting, other medical imaging, or non-medical uses.
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16.发明申请公开(公告)号：US20210208228A1
公开(公告)日：2021-07-08
申请号：US17139304
申请日：2020-12-31
IPC分类号： G01R33/56 , G01R33/58 , G01R33/50 , G01R33/44 , G01R33/483 , G01R33/561
摘要： In a Method and a device for magnetic resonance imaging of a subject using a spoiled gradient echo sequence, a B0 magnetic field strength of at most 1.5 T is used during the sequence. As part of the sequence a slice select gradient acting as a spoil gradient is played out. Substantially simultaneously with the slice select gradient a predetermined RF pulse is played out in the sequence, wherein a time-bandwidth product of the RF pulse is set so that a majority of the energy of the RF pulse is transmitted in its central main lobe.
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公开(公告)号：US20210165061A1
公开(公告)日：2021-06-03
申请号：US17101389
申请日：2020-11-23
IPC分类号： G01R33/48 , G01R33/56 , G01R33/565 , G06T7/00
摘要： In a method for generating an image data set and a reference image data set: a first raw data set is provided that is acquired with a MR system and that includes measurement signals at read-out points in k-space that lie on a first k-space trajectory; a second raw data set is provided that is acquired with the same MR system and at the same examination object at read-out points that lie on a second, different k-space trajectory that is different from the first k-space trajectory; image data sets are reconstructed from the first raw data set; a reference image data set is reconstructed from the second raw data set; the reference image data set is compared with each image dataset to generate respective similarity values; and an image data set is selected having a greatest similarity value.
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公开(公告)号：US10825171B2
公开(公告)日：2020-11-03
申请号：US16154052
申请日：2018-10-08
发明人： Sultan Haider , Stefan Huwer , Mathias Nittka , Zhigen Zhao , Joshua Shiloh Alden , Beatriz Fusaro Guimaraes
摘要： In a method and computer for visualizing a medical image data set, in particular a magnetic resonance image data set, the medical imaging data set is provided to the computer which determines a first subset of the medical image data set related to a first parameter and a second subset of the medical image data set related to a second parameter. A first color is assigned to the first subset and a second color is assigned to the second subset. The first subset is transferred to a display in a first color presentation using the first color and the second subset is transferred in a second color presentation using the second color. The first color presentation and the second color presentation are combined for visualizing the medical imaging data set.
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公开(公告)号：US20190391220A1
公开(公告)日：2019-12-26
申请号：US16448757
申请日：2019-06-21
摘要： In a method and apparatus for determining parameter values in voxels of an examination object using magnetic resonance fingerprinting (MRF), a first signal comparison is made of signal characteristics of established voxel time series with first comparison signal characteristics. Further synthetic comparison signal characteristics are generated from the first comparison signal characteristics and values determined in the first signal comparison. The generated further comparison signal characteristics are used to perform a further signal comparison, with which values of at least a first and a second further parameter are determined. From the further comparison signal characteristics, a value of at least one further parameter is determined that could not necessarily already be determined in the first signal comparison.
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20.发明申请公开(公告)号：US20190310334A1
公开(公告)日：2019-10-10
申请号：US16376180
申请日：2019-04-05
IPC分类号： G01R33/44 , G01R33/561 , G01R33/56
摘要： In a method and magnetic resonance apparatus for generating a B0 map of a region of interest, a magnetic resonance data set containing a number of image data sets is obtained and provided in a computer, wherein the image data sets are recorded using at least two measurement sequences and the mutually corresponding pixels of the image data sets each represent a time-dependent signal evolution. A B0 map of the region of interest is generated by the computer from the image data sets, wherein the B0 value of a pixel of the B0 map is determined from the associated signal evolution.
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