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    METHODS AND SYSTEMS FOR MAXWELL COMPENSATION FOR SPIN-ECHO TRAIN IMAGING
    44.
    发明申请
    METHODS AND SYSTEMS FOR MAXWELL COMPENSATION FOR SPIN-ECHO TRAIN IMAGING 有权

    公开(公告)号：US20220357416A1

    公开(公告)日：2022-11-10

    申请号：US17732155

    申请日：2022-04-28

    Applicant: University of Virginia Patent Foundation

    Inventor： John P. Mugler, III ,  Craig H. Meyer ,  Adrienne Campbell ,  Rajiv Ramasawmy ,  Josef Pfeuffer

    IPC: G01R33/565 ,  G01R33/561

    Abstract: Methods, computing devices, and MRI systems that reduce artifacts produced by Maxwell gradient terms in TSE imaging using non-rectilinear trajectories are disclosed. With this technology, a RF excitation pulse is generated to produce transverse magnetization that generates a NMR signal and a series of RF refocusing pulses to produce a corresponding series of NMR spin-echo signals. An original encoding gradient waveform comprising a non-rectilinear trajectory is modified by adjusting a portion of the original encoding gradient waveform or introducing a zero zeroth-moment waveform segment at end(s) of the original encoding gradient waveform. During an interval adjacent to each of the series of RF refocusing pulses a first gradient pulse is generated. At least one of the first gradient pulses is generated according to the modified gradient waveform. An image is constructed from generated digitized samples of the NMR spin-echo signals obtained.

    Multiband spiral cardiac MRI with non-cartesian reconstruction methods
    45.
    发明授权
    Multiband spiral cardiac MRI with non-cartesian reconstruction methods 有权

    公开(公告)号：US11320506B2

    公开(公告)日：2022-05-03

    申请号：US16843869

    申请日：2020-04-08

    Applicant: University of Virginia Patent Foundation

    Inventor： Changyu Sun ,  Frederick H. Epstein ,  Yang Yang ,  Xiaoying Cai ,  Michael Salerno ,  Craig H. Meyer ,  Daniel Stuart Weller

    IPC: G01R33/48 ,  G01R33/36 ,  G01R33/567 ,  G06T7/262 ,  G01R33/58

    Abstract: A computerized method of reconstructing acquired magnetic resonance image (MRI) data to produce a series of output images includes acquiring a multiband k-space data set from a plurality of multiband slices of spiral MRI data; simultaneously acquiring a single band k-space data set comprising respective single band spiral image slices that are each associated with a respective one of the multiband slices in the multiband k-space data set; using the single band k-space data set, for each individual multiband slice, calculating a respective calibration kernel to apply to the multi-band k-space data set for each individual multiband slice; separating each individual multiband slice from the multiband k space data set by phase demodulating the multi-band k-space data using multiband phase demodulation operators corresponding to the individual multiband slice and convolving phase demodulated multi-band k-space data with a selected convolution operator to form a gridded set of the multi-band k-space data corresponding to the individual multiband slice.

    MAGNETIC FIELD MONITORING OF SPIRAL ECHO TRAIN IMAGING
    47.
    发明申请
    MAGNETIC FIELD MONITORING OF SPIRAL ECHO TRAIN IMAGING 审中-公开

    公开(公告)号：US20180292499A1

    公开(公告)日：2018-10-11

    申请号：US15947443

    申请日：2018-04-06

    Applicant: University of Virginia Patent Foundation ,  Siemens Healthcare GmbH

    Inventor： Craig H. Meyer ,  John P. Mugler, III ,  Samuel W. Fielden ,  Gudrun Ruyters ,  Berthold Kiefer ,  Josef Pfeuffer

    IPC: G01R33/561 ,  G01R33/565 ,  G01R33/48 ,  G01R33/563

    CPC classification number: G01R33/5615 ,  G01R33/243 ,  G01R33/4818 ,  G01R33/4824 ,  G01R33/56308 ,  G01R33/56518 ,  G01R33/56563

    Abstract: In some aspects, the disclosed technology relates to magnetic field monitoring of spiral echo train imaging. In one embodiment, a method for spiral echo train imaging of an area of interest of a subject includes measuring k-space values and field dynamics corresponding to each echo of a spiral echo pulse train, using a dynamic field camera and a magnetic resonance imaging (MRI) system. The dynamic field camera is configured to measure characteristics of fields generated by the MRI system; the characteristics include at least one imperfection associated with the MRI system. The spiral echo pulse train corresponds to a spiral trajectory scan from the MRI system that obtains magnetic resonance imaging data using a pulse sequence which applies spiral gradients in-plane with through-plane phase encoding. The method also includes generating, based on the characteristics of the fields measured by the dynamic field camera and based on the obtained magnetic resonance imaging data, a model of the k-space trajectory corresponding to each echo of the spiral echo pulse train; and, based on the generated model of the k-space trajectory, reconstructing images that correspond to the area of interest and that are compensated for the at least one imperfection associated with the MRI system.

    Systems and methods for regularized reconstructions in MRI using side information
    48.
    发明授权
    Systems and methods for regularized reconstructions in MRI using side information 有权

    公开(公告)号：US09874623B2

    公开(公告)日：2018-01-23

    申请号：US13867885

    申请日：2013-04-22

    Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

    Inventor： Samuel W. Fielden ,  Craig H. Meyer

    IPC: G01V3/00 ,  G01R33/56

    CPC classification number: G01R33/5608

    Abstract: Systems and methods for magnetic resonance imaging (MRI) using side information for improved reconstruction are disclosed. In one aspect, in accordance with one example embodiment, images obtained using heteronuclei, such as Fluorine-19 (19F), can be reconstructed using one or more methods to provide improved resolution and detail. The system can use anatomical proton MRI scans. The system can use multiple smoothing techniques to improve the signal-to-noise ratio (SNR). The system can also use weighted smoothing using information from anatomical proton MRI scans to improve resolution.

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