-
公开(公告)号：US20230133700A1
公开(公告)日：2023-05-04
申请号：US17514654
申请日：2021-10-29
发明人： Songhua Chen , Wei Shao
摘要： System and methods for nuclear magnetic resonance (NMR) fluid substitution are provided. NMR logging measurements of a reservoir rock formation are acquired. Fluid zones within the reservoir rock formation are identified based on the acquired measurements. The fluid zones include water zones comprising water-saturated rock and at least one oil zone comprising rock saturated with multiphase fluids. Water zones having petrophysical characteristics matching those of the oil zone(s) within the formation are selected. NMR responses to multiphase fluids resulting from a displacement of water by hydrocarbon in the selected water zones are simulated. A synthetic dataset including NMR T2 distributions of multiphase fluids is generated based on the simulation. The synthetic dataset is used to train a machine learning (ML) model to substitute NMR T2 distributions of multiphase fluids with those of water. The trained ML model is applied to the NMR logging measurements acquired for the oil zone(s).
-
公开(公告)号：US11579230B2
公开(公告)日：2023-02-14
申请号：US16468849
申请日：2017-12-06
IPC分类号： G01R33/561 , G01R33/50 , G01R33/56 , G01R33/54 , G06T11/00 , G06T7/00 , G06K9/00 , G16H30/20 , G06V20/64
摘要： The invention provides for a magnetic resonance imaging system (100) for acquiring magnetic resonance data (142) from a subject (118) within a measurement zone (108). The magnetic resonance imaging system (100) comprises: a processor (130) for controlling the magnetic resonance imaging system (100) and a memory (136) storing machine executable instructions (150, 152, 154), pulse sequence commands (140) and a dictionary (144). The pulse sequence commands (140) are configured for controlling the magnetic resonance imaging system (100) to acquire the magnetic resonance data (142) of multiple steady state free precession (SSFP) states per repetition time. The pulse sequence commands (140) are further configured for controlling the magnetic resonance imaging system (100) to acquire the magnetic resonance data (142) of the multiple steady state free precession (SSFP) states according to a magnetic resonance fingerprinting protocol. The dictionary (144) comprises a plurality of tissue parameter sets. Each tissue parameter set is assigned with signal evolution data pre-calculated for multiple SSFP states.
-
公开(公告)号：US20230038549A1
公开(公告)日：2023-02-09
申请号：US17876734
申请日：2022-07-29
发明人： Mei Yun Wang , Xian Chang Zhang , Yan Bai , Rui Zhang , Ru Shi Chen
摘要： In a method for measuring brain free water content, in response to an RF excitation field generated on the basis of a magnetic resonance fingerprinting sequence and applied to the brain, an equilibrium magnetization mixed term (M0) signal is acquired from radiation emitted by each excited voxel of the brain, to obtain an M0 value of each voxel of the brain; a receive coil sensitivity (RP) value of each voxel of the brain is acquired; the M0 value of each voxel of the brain is divided by the RP value of the corresponding voxel to obtain a proton density (PD) value of each voxel of the brain; a PD value of cerebrospinal fluid is taken to be a reference PD value; and the PD value of each voxel of the brain is divided by the reference PD value to obtain the free water content of each voxel of the brain. The method advantageously increases the speed and accuracy of measurement of brain free water content.
-
公开(公告)号：US11550076B2
公开(公告)日：2023-01-10
申请号：US17155497
申请日：2021-01-22
申请人： Carl Edwards , Marc Ramirez , Otto Fanini , Stanislav Forgang , Ryan Rocheleau
发明人： Carl Edwards , Marc Ramirez , Otto Fanini , Stanislav Forgang , Ryan Rocheleau
摘要： Methods and logging systems for performing nuclear magnetic resonance (NMR) logging in downhole operations are described. The methods include performing a scout logging acquisition operation using an NMR logging tool to determine NMR logging parameters of a formation interval, setting an NMR logging acquisition mode based on the NMR logging parameters from the scout logging acquisition operation, and performing an NMR data logging operation to determine properties of the formation interval based on the set NMR logging acquisition mode.
-
公开(公告)号：US11543478B2
公开(公告)日：2023-01-03
申请号：US16783531
申请日：2020-02-06
发明人： Rene Botnar , Radhouene Neji , Claudia Prieto , Giorgia Milotta
IPC分类号： G01R33/50 , G01R33/48 , G01R33/56 , G01R33/567 , G06T7/00
摘要： A method and apparatus for generating a T1 or T2 map for a three-dimensional (3D) image volume of a subject. The method includes acquiring first, second, and third 3D images of the image volume of the subject. Signal evolutions of voxels through the first to third 3D images by comparing voxel intensity levels of corresponding voxel locations in the first, second, and third 3D images. A simulation dictionary representing the signal evolutions for a number of different tissue parameter combinations is obtained. The T1 or T2 map is generated by comparing the determined signal evolutions to entries in the dictionary and by finding, for each of the determined signal evolutions, the entry in the dictionary that best matches the determined signal evolution.
-
公开(公告)号：US20220361765A1
公开(公告)日：2022-11-17
申请号：US17734768
申请日：2022-05-02
发明人： Michael J. CIMA , Matthew LI , Christophoros C. VASSILIOU , Negar TAVASSOLIAN , Lina Avancini COLUCCI
摘要： The invention features methods for detecting the hydration state or vascular volume of a subject using a device capable of nuclear magnetic resonance (NMR) measurement. The methods involve exposing a portion of a tissue of the subject in vivo to a magnetic field and RF pulse from the device to excite hydrogen nuclei of water within the tissue portion, and measuring a relaxation parameter of the hydrogen nuclei in the tissue portion, the relaxation parameter being a quantitative measure of the hydration state or vascular volume of the subject as a whole. The invention also features devices and computer-readable storage media for performing the methods of the invention.
-
公开(公告)号：US11493461B1
公开(公告)日：2022-11-08
申请号：US17360009
申请日：2021-06-28
申请人： Baoyan Li , Hasan Kesserwan
发明人： Baoyan Li , Hasan Kesserwan
摘要： A method of estimating a wettability characteristic of a rock material includes acquiring a plurality of T2 distributions based on nuclear magnetic resonance (NMR) measurements of a rock material under a plurality of fluid saturated rock conditions, constructing a measurement matrix based on the plurality of T2 distributions, and performing non-negative factorization of the measurement matrix to determine feature components. The method also includes reconstructing the plurality of T2 distributions based on the feature components, and extracting a first set of T2 distributions associated with mobile water under a wetting condition and a second set of T2 distributions associated with mobile water under a non-wetting condition based on the feature components, and calculating a wettability index (WI) based on the first extracted set of T2 distributions and the second extracted set of T2 distributions.
-
公开(公告)号：US11454691B1
公开(公告)日：2022-09-27
申请号：US17472838
申请日：2021-09-13
申请人： THE UNITED STATES OF AMERICA, as represented by the Secretary, Department of Health and Human Services , Siemens Healthcare GmbH
发明人： Peter Kellman , Hui Xue , Kelvin Chow
摘要： Systems and methods to determine a first map of a first parameter based on first signals acquired by a magnetic resonance imaging system, the first map associating each of a plurality of voxels with a respective value of the first parameter, the first parameter quantifying a first physical characteristic of an object represented by the plurality of voxels, determine a second map of a second parameter based on the first signals, the second map associating each of the plurality of voxels with a respective value of the second parameter, the second parameter quantifying a second physical characteristic of the object, and determine a dark-blood phase-sensitive inversion recovery late gadolinium enhancement image based on the first map of the first parameter and on the second map of the second parameter.
-
公开(公告)号：US11442127B2
公开(公告)日：2022-09-13
申请号：US16603335
申请日：2018-04-06
发明人： Chris Flask , Christian Anderson , Xin Yu , Nicole Steinmetz , Mark A. Griswold , Susann Brady-Kalnay
摘要： The present disclosure provides a method of DDCE-MRF. The method can include: a) introducing two or more contrast agents to a region of interest (ROI) of a subject, the two or more contrast agents having different relaxivities; b) measuring a T1 relaxation time and a T2 relaxation time for locations within the ROI using magnetic resonance fingerprinting (MRF); c) determining, using equations that relate the different relaxivities, the T1 relaxation time, the T2 relaxation time, and concentrations of the two or more contrast agents, the concentrations of the two or more contrast agents for each of the locations within the ROI; and d) producing an image depicting the ROI based, at least in part, on the concentrations of the two or more contrast agents.
-
公开(公告)号：US11432736B2
公开(公告)日：2022-09-06
申请号：US16465629
申请日：2017-12-05
发明人： Cristian Lorenz , Peter Bornert , Tobias Klinder
摘要： The invention provides for a medical imaging system (700) comprising: a memory (734) for storing machine executable instructions (740), a display (732) for rendering a user interface (800), and a processor (730). Execution of the machine executable instructions causes the processor to receive (1000) three dimensional medical image data (746) descriptive of a region of interest (709) of a subject (718). The region of interest comprises a spine (200). Execution of the machine executable instructions further causes the processor to receive (1002) a set of spinal coordinate systems (748) each descriptive of a location and an orientation of spinal vertebrae in the three dimensional medical image data. The set of spinal coordinate systems further comprises a set of spine centerline positions (102) each positioned on a spine centerline (108). Execution of the machine executable instructions further causes the processor to receive (1004) a mapping (750) between the set of spinal coordinate systems and a simplified coordinate system. The simplified coordinate system comprises a spinal height (300) descriptive of a position along the spine centerline. The simplified coordinate system further comprises a rotational orientation relative to a local vertebrae orientation. The simplified coordinate system further comprises an offset from the spine centerline. Execution of the machine executable instructions further cause the processor to repeatedly receive (1006) a simplified coordinate (752) of the simplified coordinate system from the user interface. Execution of the machine executable instructions further cause the processor to repeatedly calculate (1008) a spinal image rendering (754). Calculating the spinal image rendering comprises using the mapping to transform the simplified coordinate into the set of spinal coordinate systems to determine an image location in the three dimensional medical image data. Execution of the machine executable instructions further cause the processor to repeatedly render (1010) the spinal image rendering on the display.
-
-
-
-
-
-
-
-
-
搜索结果
837 条记录 (耗时 0.032 秒)