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1.发明授权公开(公告)号：US11474176B2
公开(公告)日：2022-10-18
申请号：US17331378
申请日：2021-05-26
发明人： Ian Connell , Chad Harris , Geron Bindseil , Andrew T. Curtis
IPC分类号： G01R33/3875 , G01R33/54 , G01R33/381
摘要： A method, device, and system for reducing inhomogeneity in an imaging magnetic field during magnetic resonance imaging is described. The method includes generating a corrective magnetic field during imaging, the corrective magnetic field having a first magnetic field component and a second magnetic field component with a phase separation therebetween. The first and second components are generated according to a stability parameter decomposed from a stability field that correct an instability identified within the imaging magnetic field.
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公开(公告)号：US11119171B2
公开(公告)日：2021-09-14
申请号：US15745169
申请日：2015-07-16
发明人： Cameron A. Piron , Jeff Stainsby , Chad Harris , Philip Beatty
IPC分类号： G01R33/54 , G01R33/561 , A61B5/055 , A61B5/00 , A61B5/03 , G01R33/563
摘要： Systems and methods for adaptive, multi-resolution magnetic resonance imaging (“MRI”), in which an MRI scan prescription is adaptively changed to acquire high-quality data from select regions-of-interest (“ROI”) in a larger field-of-view (“FOV”), are provided. The higher quality data can include data representing higher spatial resolution, higher signal-to-noise ratio (“SNR”), increased diffusion encoding via repeated acquisition with a larger number of diffusion-encoding directions, and so on. A composite image can be generated that displays the higher quality images of the ROIs overlaid on the larger FOV.
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公开(公告)号：US11662416B2
公开(公告)日：2023-05-30
申请号：US17561890
申请日：2021-12-24
发明人： Chad Harris , Geron Bindseil , Andrew T. Curtis
IPC分类号： G01R33/565 , G01R33/3875
CPC分类号： G01R33/56581 , G01R33/3875
摘要： A method, electromagnet device, and system for reducing a higher order term of a concomitant field in an imaging magnetic field during magnetic resonance imaging is described. The electromagnet system has a first shim coil configured to be driven to generate a first compensation magnetic field during imaging according to a first second-order compensation term, the first compensation magnetic field having a similar amplitude but opposite direction as that of a first second-order concomitant magnetic field.
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公开(公告)号：US11428760B2
公开(公告)日：2022-08-30
申请号：US16346470
申请日：2016-10-31
发明人： Chad Harris , Geron Bindseil , William Handler
IPC分类号： G01R33/56 , G01R33/28 , G01R33/385 , G01R33/42 , G01V3/175
摘要： Described here are systems and methods for imaging a subject with a magnetic resonance imaging (“MRI”) system using magnetic field gradients generated by one or more gradient coils operating with gradient coil settings (e.g., gradient amplitudes, gradient slew rates) above a threshold at which peripheral nerve stimulation (“PNS”) is likely to be induced in the subject. A dielectric assembly is positioned adjacent a skin surface of the subject such that the dielectric assembly attenuates the local electric fields induced by the magnetic field gradients, which would be likely to induce PNS when the dielectric assembly is not arranged adjacent the skin surface of the subject. As a result of the dielectric assembly placed adjacent the skin surface of the subject, the gradient coil settings can be increased above the threshold without inducing PNS in the subject.
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公开(公告)号：US11243287B2
公开(公告)日：2022-02-08
申请号：US16590979
申请日：2019-10-02
发明人： Chad Harris , Geron Bindseil , Andrew T. Curtis
IPC分类号： G01R33/565 , G01R33/3875
摘要： A method, electromagnet device, and system for reducing a higher order term of a concomitant field in an imaging magnetic field during magnetic resonance imaging is described. The electromagnet system has a first shim coil configured to be driven to generate a first compensation magnetic field during imaging according to a first second-order compensation term, the first compensation magnetic field having a similar amplitude but opposite direction as that of a first second-order concomitant magnetic field.
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