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公开(公告)号：US20180120399A1
公开(公告)日：2018-05-03
申请号：US15799025
申请日：2017-10-31
发明人： Yongchuan Lai , Xiaoli Zhao , Weiwei Zhang , Stephen Joseph Garnier , Lisha Nie , Pengfei Lu , Hongbin Wang
CPC分类号： G01R33/56 , G01R33/34046 , G01R33/3415 , G01R33/36 , G01R33/5659
摘要： The present invention provides a method and apparatus for correcting a uniformity of a magnetic resonance image, the method comprising: acquiring a first uniformity enhancement image by a phased-array uniformity enhancement method; and dividing the first uniformity enhancement image by a receiving sensitivity distribution value of a body coil in a magnetic resonance imaging device, so as to acquire a second uniformity enhancement image. The method may further comprise: dividing the second uniformity enhancement image by a spatial signal distribution value resulting from a field strength distribution of a transmitting radio-frequency field, so as to acquire a third uniformity enhancement image.
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公开(公告)号：US10768252B2
公开(公告)日：2020-09-08
申请号：US16169533
申请日：2018-10-24
发明人： Lisha Nie , Yongchuan Lai , Xuan Liu
IPC分类号： G01R33/24 , G01R33/48 , G01R33/561
摘要： Various methods and systems are provided for acquiring k-space data for magnetic resonance imaging. In one example, after applying a phase encoding gradient, the k-space data of a phase angle is acquired while applying a frequency encoding gradient. An amplitude of the phase encoding gradient and a duration of the phase encoding gradient determined based on each and every of a phase angle of the phase encoding line and a duration of the frequency encoding gradient.
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公开(公告)号：US10690742B2
公开(公告)日：2020-06-23
申请号：US16361913
申请日：2019-03-22
发明人： Lisha Nie , Yongchuan Lai , Tongzhou Wang , Tengfei Wang
IPC分类号： G01R33/58 , G01R33/385 , G01R33/48 , G01R33/54 , G01R33/56
摘要： Methods and apparatuses for calibrating a center frequency of MR and an MRI system are disclosed herein. An exemplary method comprises applying a first set of gradient fields, receiving data information acquired by an RF coil and generating a first image; applying a second set of gradient fields in directions different than those of the first set of gradient fields, receiving data information acquired by the RF coil and generating a second image; calculating a shift of the center frequency based on the first image and the second image; and correcting the center frequency based on the shift of the center frequency.
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公开(公告)号：US20200132793A1
公开(公告)日：2020-04-30
申请号：US16169533
申请日：2018-10-24
发明人： Lisha Nie , Yongchuan Lai , Xuan Liu
IPC分类号： G01R33/48 , G01R33/561
摘要： Various methods and systems are provided for acquiring k-space data for magnetic resonance imaging. In one example, after applying a phase encoding gradient, the k-space data of a phase angle is acquired while applying a frequency encoding gradient. An amplitude of the phase encoding gradient and a duration of the phase encoding gradient determined based on each and every of a phase angle of the phase encoding line and a duration of the frequency encoding gradient.
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公开(公告)号：US20190302212A1
公开(公告)日：2019-10-03
申请号：US16361913
申请日：2019-03-22
发明人： Lisha Nie , Yongchuan Lai , Tongzhou Wang , Tengfei Wang
IPC分类号： G01R33/58 , G01R33/385 , G01R33/56 , G01R33/54 , G01R33/48
摘要： Methods and apparatuses for calibrating a center frequency of MR and an MRI system are disclosed herein. An exemplary method comprises applying a first set of gradient fields, receiving data information acquired by an RF coil and generating a first image; applying a second set of gradient fields in directions different than those of the first set of gradient fields, receiving data information acquired by the RF coil and generating a second image; calculating a shift of the center frequency based on the first image and the second image; and correcting the center frequency based on the shift of the center frequency.
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