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公开(公告)号：US20240329175A1
公开(公告)日：2024-10-03
申请号：US18131246
申请日：2023-04-05
发明人： Zekang DING , Huajun SHE , Yiping DU
IPC分类号： G01R33/567 , A61B5/055 , G01R33/48 , G06T7/30 , G06T11/00
CPC分类号： G01R33/5673 , A61B5/055 , G01R33/4816 , G01R33/4818 , G06T7/30 , G06T11/006 , G06T11/008
摘要： A dynamic pulmonary magnetic resonance imaging method, including: with an ultrashort echo time sequence, acquiring pulmonary magnetic resonance signals in a free-breathing condition; during data acquisition, monitoring a respiratory condition, obtaining a respiration curve; with the respiration curve, performing motion-resolved reconstruction on the acquired pulmonary magnetic resonance data, obtaining motion-resolved lung images; performing motion field estimation on the motion-resolved lung images; performing motion-state weighted motion-compensated reconstruction on results of the motion field estimation, obtaining dynamic pulmonary magnetic resonance images; performing ventilation map estimation on the dynamic pulmonary magnetic resonance images, obtaining a pulmonary ventilation.
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2.发明公开公开(公告)号：US20240206759A1
公开(公告)日：2024-06-27
申请号：US18288267
申请日：2022-04-29
发明人： Curtis A. CORUM
CPC分类号： A61B5/055 , A61B5/0042 , A61B5/7203 , G01R33/4816 , G01R33/561 , G06F16/2365 , G06T11/006 , A61B2576/026
摘要： A system includes a machine readable storage medium storing instructions and a processor to execute the instructions. The processor executes the instructions to receive magnetic resonance imaging (MRI) data of a patient obtained via a free induction decay (FID) sequence, each FID of the FID sequence indicating missing or corrupted points at the beginning of the FID. The processor executes the instructions to replace the missing or corrupted points of each FID with estimated points to generate a corrected FID sequence. The processor executes the instructions to estimate a phase that minimizes an imaginary DC value of each corresponding FID.
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公开(公告)号：US20230366957A1
公开(公告)日：2023-11-16
申请号：US18197706
申请日：2023-05-15
发明人： Mario Zeller
IPC分类号： G01R33/24 , G01R33/48 , G01R33/565 , G01R33/561
CPC分类号： G01R33/243 , G01R33/4828 , G01R33/56563 , G01R33/5617 , G01R33/481 , G01R33/4816
摘要： According to a method, first magnetic resonance signals are captured at a first time point. Second magnetic resonance signals are captured at a second time point. The first magnetic resonance signals are provoked by nuclear spin excitations of fat and water in an examination object. The second magnetic resonance signals are provoked by nuclear spin excitations of fat and water in the examination object. The nuclear spin excitations of fat and water are in phase at the first time point. The nuclear spin excitations of fat and water are in opposed phase at the second time point. A Bo field map is determined based on the first magnetic resonance signals and the second magnetic resonance signals. Further magnetic resonance signals are captured. At least one magnetic resonance mapping is determined by reconstructing the further magnetic resonance signals. The at least one magnetic resonance mapping is corrected based on the Bo field map.
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公开(公告)号：US20190246938A1
公开(公告)日：2019-08-15
申请号：US15747202
申请日：2016-06-09
IPC分类号： A61B5/055 , A61B5/00 , G01R33/48 , G01R33/56 , G01R33/563
CPC分类号： A61B5/055 , A61B5/4064 , A61B5/4088 , A61B5/4244 , A61B5/425 , A61B5/4866 , A61B2576/026 , G01R33/4816 , G01R33/5601 , G01R33/5635 , G01R33/56366
摘要： A quantitative, ultrashort time to echo, contrast-enhanced magnetic resonance imaging technique is provided. The technique can be used to accurately measure contrast agent concentration in the blood, to provide clear, high-definition angiograms, and to measure absolute quantities of cerebral blood volume on a voxel-by-voxel basis.
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5.发明申请公开(公告)号：US20190187231A1
公开(公告)日：2019-06-20
申请号：US16282488
申请日：2019-02-22
申请人： Duke University
IPC分类号： G01R33/483 , G01R33/48 , G01R33/465 , G01R33/34 , A61B5/08 , A61B5/107 , G01R33/56 , G01R33/563 , A61B5/055
CPC分类号： G01R33/483 , A61B5/055 , A61B5/08 , A61B5/1075 , A61B5/416 , A61B5/4887 , A61B5/7239 , G01N24/08 , G01R33/34076 , G01R33/465 , G01R33/4816 , G01R33/5601 , G01R33/56341
摘要： Methods and systems for assessing pulmonary gas exchange and/or alveolar-capillary barrier status include obtaining at least one MRI image and/or image data of 129Xe dissolved in the red blood cells (RBC) in the gas exchange regions of the lungs of a patient. The image is sufficiently sensitive to allow a clinician or image recognition program to assess at least one of pulmonary gas exchange, barrier thickness or barrier function based on the 129Xe MRI RBC image.
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公开(公告)号：US10076249B2
公开(公告)日：2018-09-18
申请号：US14817450
申请日：2015-08-04
发明人： Silke Maria Lechner-Greite , Florian Wiesinger , Desmond Teck Beng Yeo , Matthew Richard Tarasek
CPC分类号： A61B5/015 , A61B5/055 , A61B5/4836 , A61B5/7214 , A61B5/7285 , A61B18/02 , A61B18/04 , A61B18/1815 , A61B2018/00577 , A61B2018/00791 , G01R33/4804 , G01R33/4814 , G01R33/4816 , G01R33/5602
摘要： A system and method for tracking temperature changes in tissue and bone is disclosed. In one aspect, the temperature changes are tracked simultaneously with high spatial encoding and temporal efficiency. The method is robust in terms of B0 and chemical shift off-resonance, as well as insensitive to eddy currents for accurate temperature mapping. Zero TE (ZTE) based MR thermometry is utilized herein to extract temperature changes from proton density and T1 weighted images. Additionally, T1 signal contamination is corrected for by calibrating T1 and B0 by using a variable flip angle method to achieve temperature mapping in bone, aqueous and adipose tissue simultaneously.
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7.发明授权公开(公告)号：US09915718B2
公开(公告)日：2018-03-13
申请号：US14501399
申请日：2014-09-30
IPC分类号： G01R33/561 , G01R33/36 , G01R33/48 , G01R33/24 , G01R33/565
CPC分类号： G01R33/561 , G01R33/246 , G01R33/36 , G01R33/4816 , G01R33/4818 , G01R33/5659
摘要： In a method for the determination of sensitivity profiles of local coils in the acquisition of magnetic resonance data, a first measurement data set of an examination area is acquired with a first acquisition coil, a second measurement data set of the examination area is acquired with a local coil, and a sensitivity profile of the local coil that is used is determined on the basis of the first measurement data set and the measurement data set. The first measurement data set and the second measurement data set are acquired using a pulse sequence with ultrashort echo times. In the determination of the sensitivity profile, errors due to dephasings are avoided as best as possible by the acquisition of the measurement data sets with a pulse sequence with ultrashort echo times (i.e. in particular echo times TE shorter than 0.5 ms); in particular, the dephasings are smaller given these echo times than in the case of gradient echo (GRE)-based pulse sequences.
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公开(公告)号：US20180011158A1
公开(公告)日：2018-01-11
申请号：US15544397
申请日：2016-01-21
CPC分类号： G01R33/443 , A61B5/055 , G01R33/243 , G01R33/246 , G01R33/288 , G01R33/4816 , G01R33/4824 , G01R33/4828 , G01R33/54 , G01R33/5608 , G01R33/56563
摘要： The invention provides for a magnetic resonance imaging system (100, 300, 100) for acquiring magnetic resonance data (110, 1104) from a subject (118) within an imaging zone (108). The magnetic resonance imaging system comprises a memory (136) for storing machine executable instructions (160, 162, 164, 166, 316) and pulse sequence data (140, 1102). The pulse sequence data comprises instructions for controlling the magnetic resonance imaging system to acquire magnetic resonance data according to a magnetic resonance imaging method. The magnetic resonance imaging system further comprises a processor (130) for controlling the magnetic resonance imaging system. Execution of the machine executable instructions causes the processor to: acquire (1200) the magnetic resonance data by controlling the magnetic resonance imaging system with the pulse sequence data; calculate (1202) a B0 inhomogeneity map (148) by analyzing the magnetic resonance data according to the magnetic resonance imaging method, calculate (1204) a B1 phase map (150) and/or a B1 amplitude map (1106) by analyzing the magnetic resonance data according to the magnetic resonance imaging method; and calculate (1206) a second derivative (1110) of the B1 phase map and/or a second derivative of the B1 magnitude map 1 and/or a second derivative of the B0 in homogeneity map in at least one predetermined direction. The second derivative is calculated using a corrected voxel size in the at least one predetermined direction, wherein the corrected voxel size is calculated using a correction factor calculated from the derivative of the B0 inhomogeneity map.
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9.发明授权公开(公告)号：US09645214B2
公开(公告)日：2017-05-09
申请号：US14095707
申请日：2013-12-03
发明人： Ileana Hancu , Selaka Bandara Bulumulla , Florian Wiesinger , Laura Irene Sacolick , Seung Kyun Lee
CPC分类号： G01R33/4816 , G01R33/246
摘要： Systems and methods for determining electrical properties using Magnetic Resonance Imaging (MRI) are provided. One method includes applying an ultra-short echo time (TE) pulse sequence in a Magnetic Resonance Imaging (MRI) system and acquiring a complex B1+B1− quantity from an object following the application of the ultra-short TE pulse sequence, where B1+ is a complex amplitude of a transmit radio-frequency (RF) magnetic field and B1− is a complex amplitude of a receive RF magnetic field. The method also includes estimating, with a processor, one or more electrical properties of the object using the complex amplitudes of the transmit RF magnetic field and the receive RF magnetic field.
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公开(公告)号：US09575151B2
公开(公告)日：2017-02-21
申请号：US14039238
申请日：2013-09-27
申请人： David Grodzki
发明人： David Grodzki
CPC分类号： G01R33/4816 , A61B5/055 , G01R33/4824
摘要： In a method to operate a magnetic resonance apparatus with a magnetic resonance sequence—in particular a PETRA sequence—in which k-space is radially scanned for an image acquisition in a first region of k-space that does not include the center of k-space, and in which an excitation pulse is radiated as the full strength of at least two phase coding gradients is reached, and in which k-space is scanned in a Cartesian manner—in particular by single point imaging—in a second region of k-space remaining without the first region, the gradient strength corresponding to a shortest total acquisition time is determined automatically from predetermined sequence parameters and/or sequence parameters defined by a user. The sequence parameters parameterize the magnetic resonance sequence and describe the number of acquisitions for the regions of k-space and the repetition time, and the gradient strength is indicated to a user as a recommendation and/or is set automatically in the implementation of the magnetic resonance sequence.
摘要翻译： 在具有磁共振序列（特别是PETRA序列）的操作磁共振装置的方法中，其中k空间被径向扫描以在不包括k-空心的中心的k空间的第一区域中进行图像采集， 空间，并且其中激发脉冲被辐射为达到至少两个相位编码梯度的全部强度，并且其中k空间以笛卡尔方式扫描，特别是通过单点成像在k的第二区域中扫描 - 没有第一区域的空间，从用户定义的预定序列参数和/或序列参数自动确定对应于最短总采集时间的梯度强度。 顺序参数参数化磁共振序列，并描述k空间和重复时间的区域的采集次数，梯度强度作为推荐指示给用户，和/或自动设置在磁场的实现中 共振序列。
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