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公开(公告)号：US11703559B2
公开(公告)日：2023-07-18
申请号：US17716001
申请日：2022-04-08
发明人： Fang Dong , De He Weng , Nan Xiao
IPC分类号： G01R33/56 , G01R33/48 , G06T11/00 , G01R33/565
CPC分类号： G01R33/5608 , G01R33/4824 , G01R33/56545 , G06T11/006 , G06T2211/424
摘要： The present disclosure is directed to MRI techniques. The techniques include occupying a central region of a first k-space with full sampling along a Cartesian trajectory, occupying a peripheral region of the first k-space with undersampling along a non-Cartesian trajectory; acquiring sensitivity distribution information of receiving coils; based on a sensitivity distribution chart, merging the Cartesian data of the central region according to multiple channels to obtain a third k-space; based on the sensitivity distribution chart, applying parallel imaging and compressed sensing to the undersampled non-Cartesian trajectory to reconstruct an image, obtaining a second k-space by transformation, and when the second k-space and third k-space are synthesized, using a central region of the second k-space to replace the third k-space of a corresponding region to obtain a k-space suitable for image reconstruction.
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公开(公告)号：US20220273185A1
公开(公告)日：2022-09-01
申请号：US17680130
申请日：2022-02-24
发明人： Liu En Yang , Yuan Yuan Kang , Fang Dong , Le Zhang
摘要： Abdomen scanning techniques are disclosed. The techniques include acquiring a current abdomen positioning image; inputting the current abdomen positioning image into a pre-trained liver outline acquisition model, and obtaining current liver outline information outputted by the liver outline acquisition model; the liver outline acquisition model being obtained by training, using a first quantity of historical abdomen positioning images as an input set, and using a first quantity of historical liver outline information respectively corresponding to the first quantity of historical abdomen positioning images as an output set; based on the current liver outline information, calculating an abdomen scanning range and a scanning center position, and applying the scanning range and scanning center position in a current scanning protocol; and using the scanning protocol to perform a magnetic resonance scan of an abdomen.
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公开(公告)号：US20220057465A1
公开(公告)日：2022-02-24
申请号：US17405285
申请日：2021-08-18
发明人： Shu Qun Xie , Yan Tu Huang , Fang Dong
摘要： A signal processing method including receiving an original reference radio frequency signal from a receiving antenna group; receiving the time series of the control signal associated with the transmission event of the radio frequency pulses; synchronizing the time series with the original reference radio frequency signal, and determining the echo train in the original reference radio frequency signal in a repetition time of the pulse sequence, wherein the echo train corresponds to the part of the time series associated with the transmission event of the radio frequency pulses in time sequence; setting the sampling points in the domains of the starting point and a first ending point of the echo train; and generating a fitting signal based on the sampling points to eliminate the radio frequency interference signal resulted from the transmission event of the radio frequency pulses.
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4.发明申请公开(公告)号：US20210052187A1
公开(公告)日：2021-02-25
申请号：US16998340
申请日：2020-08-20
发明人： Jin Qiang He , De He Weng , Shu Qun Xie , Fang Dong
摘要： The present disclosure provides techniques for determining a respiration phase by extracting a distance characteristic value, a score characteristic value, and an area characteristic value from the respiration signal, wherein the distance characteristic value, the score characteristic value and the area characteristic value are used to indicate waveform variation between two adjacent waveforms in the respiration signal. The techniques include training a respiration signal model according to the distance characteristic value, the score characteristic value, and the area characteristic value to determine the respiration phase of the respiration signal using the respiration signal model.
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公开(公告)号：US20180356487A1
公开(公告)日：2018-12-13
申请号：US16007332
申请日：2018-06-13
IPC分类号： G01R33/565 , G01R33/54 , G01R33/56 , G01R33/483
CPC分类号： G01R33/56554 , G01R33/4616 , G01R33/4833 , G01R33/543 , G01R33/5602 , G01R33/5616 , G01R33/5617 , G01R33/56341 , G01R33/56545
摘要： In a magnetic resonance readout-segmented diffusion-weighted imaging method, apparatus, and storage medium, a non-linear phase RF excitation pulse is applied to nuclear spins that exhibit a magnetization intensity vector, and applying, in a slice selection direction, a slice selection gradient pulse of duration corresponding to the non-linear phase RF excitation pulse, so as to flip the magnetization intensity vector into the X-Y plane. Diffusion weighting is performed on the magnetization intensity vector flipped into the X-Y plane. A readout-segmented sampling sequence is executed to read out raw data in a segmented manner from the magnetization intensity vector resulting from diffusion weighting. A view angle tilting gradient pulse is applied in the slice selection direction.
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公开(公告)号：US11883211B2
公开(公告)日：2024-01-30
申请号：US17338099
申请日：2021-06-03
发明人： Jin Qiang He , Fang Dong , De He Weng
CPC分类号： A61B5/7292 , A61B5/055 , A61B5/0816 , A61B5/7267
摘要： The disclosure relates to techniques for triggering magnetic resonance data acquisition. The techniques include detecting a respiration direction of a respiration signal of an acquisition subject, predicting in real time an amplitude peak value of an expiration signal in the current respiration period according to the real-time respiration signal of the acquisition subject, multiplying the amplitude peak value by a preset coefficient, and using the product as a trigger point threshold of the current respiration period. When it is determined that an expiration stage of the current respiration period is starting, the techniques also include calculating in real time or periodically the absolute value of the difference between the amplitude of the current expiration signal and the trigger point threshold currently calculated, and if the absolute value of the difference is less than a preset difference threshold, then triggering MR data acquisition.
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公开(公告)号：US10928476B2
公开(公告)日：2021-02-23
申请号：US16007332
申请日：2018-06-13
IPC分类号： G01R33/565 , G01R33/54 , G01R33/56 , G01R33/483 , G01R33/563 , G01R33/46 , G01R33/561
摘要： In a magnetic resonance readout-segmented diffusion-weighted imaging method, apparatus, and storage medium, a non-linear phase RF excitation pulse is applied to nuclear spins that exhibit a magnetization intensity vector, and applying, in a slice selection direction, a slice selection gradient pulse of duration corresponding to the non-linear phase RF excitation pulse, so as to flip the magnetization intensity vector into the X-Y plane. Diffusion weighting is performed on the magnetization intensity vector flipped into the X-Y plane. A readout-segmented sampling sequence is executed to read out raw data in a segmented manner from the magnetization intensity vector resulting from diffusion weighting. A view angle tilting gradient pulse is applied in the slice selection direction.
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8.发明申请公开(公告)号：US20230101609A1
公开(公告)日：2023-03-30
申请号：US17954483
申请日：2022-09-28
发明人： Fang Dong , Yan Tu Huang
IPC分类号： G01R33/565 , G06T5/50 , G06T5/00 , G01R33/54
摘要： In a motion correction method, a reference navigation image is obtained before MR data collection is performed on a target region of interest; in a process of performing the MR data collection on the target region of interest, motion detection is performed using a pilot tone signal received by a plurality of coils, and when a motion is detected, MR data collected when the motion occurs is marked as motion damage data; a post-motion navigation image is obtained when the end of the motion is detected by utilizing the pilot tone signal; registration is performed on the post-motion navigation image and the reference navigation image to obtain a motion correction parameter corresponding to the motion; and motion correction on the MR data collection is performed using the motion correction parameter. The method according to the present disclosure advantageously improves MR imaging quality.
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公开(公告)号：US20220326329A1
公开(公告)日：2022-10-13
申请号：US17716001
申请日：2022-04-08
发明人： Fang Dong , De He Weng , Nan Xiao
IPC分类号： G01R33/56 , G01R33/48 , G01R33/565 , G06T11/00
摘要： The present disclosure is directed to MRI techniques. The techniques include occupying a central region of a first k-space with full sampling along a Cartesian trajectory, occupying a peripheral region of the first k-space with undersampling along a non-Cartesian trajectory; acquiring sensitivity distribution information of receiving coils; based on a sensitivity distribution chart, merging the Cartesian data of the central region according to multiple channels to obtain a third k-space; based on the sensitivity distribution chart, applying parallel imaging and compressed sensing to the undersampled non-Cartesian trajectory to reconstruct an image, obtaining a second k-space by transformation, and when the second k-space and third k-space are synthesized, using a central region of the second k-space to replace the third k-space of a corresponding region to obtain a k-space suitable for image reconstruction.
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公开(公告)号：US20220057466A1
公开(公告)日：2022-02-24
申请号：US17405475
申请日：2021-08-18
发明人： Yu Yu Wang , Fang Dong
IPC分类号： G01R33/567 , G01R33/561 , G01R33/565 , A61B5/055
摘要： The disclosure relates to magnetic resonance imaging triggered by a prospective acquisition correction sequence. The technique comprises determining repetition time and an acquisition window time of a single-shot fast spin echo sequence; determining the maximum imaging layer number N in each physiological movement cycle on the basis of the acquisition window time and the repetition time, where N is a positive integer greater than or equal to 2; and enabling the single-shot fast spin echo sequence to obtain M layers of imaging data within at least one acquisition window time when the prospective acquisition correction sequence generates a trigger signal, where M is a positive integer greater than or equal to 2 and less than or equal to N. According to the present disclosure, a plurality of layers of imaging data are obtained within a single acquisition window time, thereby increasing a scanning speed and shortening imaging time.
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