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公开(公告)号：US11639978B2
公开(公告)日：2023-05-02
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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公开(公告)号：US20220229136A1
公开(公告)日：2022-07-21
申请号：US17610374
申请日：2020-05-06
发明人： Stephan Kannengiesser , Thomas Kluge , Gregor Körzdörfer , Mathias Nittka , Josef Pfeuffer , Peter Speier
IPC分类号： G01R33/50 , G01R33/56 , G01R33/48 , G01R33/561 , G01R33/565
摘要： Determining parameter values in image points of an examination object in an MR system by an MRF technique. Comparison signal waveforms, established using predetermined recording parameters, and each assigned to predetermined values of the parameters to be determined, are loaded. An image point time series of the examination object is acquired with an MRF recording method such that the acquired image point time series are comparable with the loaded comparison signal waveforms. A signal comparison of a section of the respective signal waveform of the acquired one image point time series is carried out with a corresponding section of loaded comparison signal waveforms to establish similarity values. The values of the parameters to be determined on the basis of the most similar comparison signal waveforms determined are determined, and then stored or output.
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公开(公告)号：US20210096199A1
公开(公告)日：2021-04-01
申请号：US17032732
申请日：2020-09-25
IPC分类号： G01R33/483 , G01R33/54 , G01R33/56 , G01R33/50 , A61B5/055
摘要： Techniques are disclosed for acquiring data of an examination object in at least two slices by means of a pulse sequence. Time intervals between excitations of neighboring slices and associated minimum intervals are determined. From these, time intervals to be adapted between excitations of neighboring slices are determined and adapted before a measurement protocol is executed, with the adapted time intervals. Through the determination of a minimum time interval between excitations of neighboring slices and the adaptation of the time intervals between excitations of neighboring slices, a falsification of measurement results can be avoided, measurement time of the chosen measurement protocol is not increased, and the user is not restricted in their choice of the slices to be excited.
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公开(公告)号：US10921406B2
公开(公告)日：2021-02-16
申请号：US16441383
申请日：2019-06-14
IPC分类号： G06T11/00 , G06T7/00 , G01R33/48 , G01R33/561 , G01R33/56
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：US20180204045A1
公开(公告)日：2018-07-19
申请号：US15875086
申请日：2018-01-19
发明人： Thorsten Feiweier , Stefan Huwer , Mathias Nittka
摘要： In a method and computer and magnetic resonance (MR) apparatus for classifying MR measurement data acquired from an object under examination by execution of an MR fingerprinting method, wherein the MR measurement data include multiple MR signal profiles acquired by the MR fingerprinting method. At least one texture parameter is derived from the MR measurement data. The MR measurement data are classified into at least one tissue class using the at least one texture parameter. The classified MR measurement data are provided as an output.
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6.发明授权公开(公告)号：US11373392B2
公开(公告)日：2022-06-28
申请号：US16378166
申请日：2019-04-08
发明人： Mathias Nittka , Gregor Korzdorfer , Peter Speier , Mark A. Griswold , Yun Jiang
摘要： A method for performing magnetic resonance fingerprinting includes acquiring a plurality of MR image datasets using at least two pulse sequence types, the plurality of MR image datasets representing signal evolutions for image elements in a region of interest, comparing the plurality of MR image datasets to a dictionary of signal evolutions to identify at least one parameter of the MR image datasets and generating a report indicating the at least one parameter of the MR image datasets.
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公开(公告)号：US11346911B2
公开(公告)日：2022-05-31
申请号：US16238554
申请日：2019-01-03
发明人： Guillaume Daval Frerot , Xiao Chen , Mariappan S. Nadar , Peter Speier , Mathias Nittka , Boris Mailhe , Simon Arberet
摘要： Machine training a network for and use of the machine-trained network are provided for tissue parameter estimation for a magnetic scanner using magnetic resonance fingerprinting. The machine-trained network is trained to both reconstruct a fingerprint image or fingerprint and to estimate values for multiple tissue parameters in magnetic resonance fingerprinting. The reconstruction of the fingerprint image or fingerprint may reduce noise, such as aliasing, allowing for more accurate estimation of the values of the multiple tissue parameters from the under sampled magnetic resonance fingerprinting information.
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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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