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公开(公告)号：US12154193B2
公开(公告)日：2024-11-26
申请号：US17859061
申请日：2022-07-07
Applicant: RENSSELAER POLYTECHNIC INSTITUTE
Inventor： Ge Wang , Wenxiang Cong , Qingsong Yang
Abstract: Systems and methods for reconstructing images for computed tomography are provided. Image reconstruction can be based on a realistic polychromatic physical model, and can include use of both an analytical algorithm and a single-variable optimization method. The optimization method can be used to solve the non-linear polychromatic X-ray integral model in the projection domain, resulting in an accurate decomposition for sinograms of two physical basis components.
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公开(公告)号：US20240290014A1
公开(公告)日：2024-08-29
申请号：US18569764
申请日：2022-06-17
Applicant: RENSSELAER POLYTECHNIC INSTITUTE
Inventor： Ge Wang , Weiwen Wu , Chuang Niu
IPC: G06T11/00 , G06T3/4046 , G06T3/4053
CPC classification number: G06T11/006 , G06T3/4046 , G06T3/4053 , G06T2211/421 , G06T2211/441 , G06T2211/444
Abstract: In one embodiment, there is provided an apparatus for ultra-low-dose (ULD) computed tomography (CT) reconstruction. The apparatus includes a low dimensional estimation neural network, and a high dimensional refinement neural network. The low dimensional estimation neural network is configured to receive sparse sinogram data, and to reconstruct a low dimensional estimated image based, at least in part, on the sparse sinogram data. The high dimensional refinement neural network is configured to receive the sparse sinogram data and intermediate image data, and to reconstruct a relatively high resolution CT image data. The intermediate image data is related to the low dimensional estimated image.
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公开(公告)号：US12051134B2
公开(公告)日：2024-07-30
申请号：US17194946
申请日：2021-03-08
Applicant: University of Iowa Research Foundation , Shandong University , Shandong Public Health Clinical Center , Rensselaer Polytechnic Institute
Inventor： Wenxiang Cong , Ye Yangbo , Ge Wang , Shuwei Mao , Yingmei Wang
CPC classification number: G06T11/006 , A61B6/032 , G06T11/003 , G06T11/005 , G06T2211/408 , G06T2211/424
Abstract: The disclosed apparatus, systems and methods relate to a framelet-based iterative algorithm for polychromatic CT which can reconstruct two components using a single scan. The algorithm can have various steps including a scaled-gradient descent step of constant or variant step sizes; a non-negativity step; a soft thresholding step; and a color reconstruction step.
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公开(公告)号：US12036055B2
公开(公告)日：2024-07-16
申请号：US17734311
申请日：2022-05-02
Applicant: RENSSELAER POLYTECHNIC INSTITUTE
Inventor： Ge Wang , Wenxiang Cong , Yan Xi
CPC classification number: A61B6/4042 , A61B6/032 , A61B6/405 , A61B6/482
Abstract: Systems and method for performing X-ray computed tomography (CT) that can improve spectral separation and decrease motion artifacts without increasing radiation dose are provided. The systems and method can be used with either a kVp-switching source or a single-kVp source. When used with a kVp-switching source, an absorption grating and a filter grating can be disposed between the X-ray source and the sample to be imaged. Relative motion of the filter and absorption gratings can by synchronized to the kVp switching frequency of the X-ray source. When used with a single-kVp source, a combination of absorption and filter gratings can be used and can be driven in an oscillation movement that is optimized for a single-kVp X-ray source. With a single-kVp source, the absorption grating can also be omitted and the filter grating can remain stationary.
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公开(公告)号：US20240036135A1
公开(公告)日：2024-02-01
申请号：US18228064
申请日：2023-07-31
Applicant: Rensselaer Polytechnic Institute
Inventor： Xun Jia , Ge Wang , Mengzhou Li , Weiwen Wu , Wenxiang Cong , Yuting Peng , Jace Grandinetti
IPC: G01R33/48 , G01R33/385
CPC classification number: G01R33/4812 , G01R33/385
Abstract: In one embodiment, there is provided a magnetic resonance (MR) subsystem for magnetic resonance imaging (MRI). The MR subsystem includes a first magnet-coil assembly and a second magnet-coil assembly. The first magnet-coil assembly includes a first magnet structure and a first gradient coil. The second magnet-coil assembly includes a second magnet structure and a second gradient coil. The first magnet-coil assembly and the second magnet-coil assembly are separated by a gap. The gap is configured to facilitate transmission of an x-ray beam from an x-ray source to an x-ray detector. The x-ray source and the x-ray detector are included in a computed tomography (CT) subsystem.
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Patent Agency Ranking
公开(公告)号：US11727569B2
公开(公告)日：2023-08-15
申请号：US17404361
申请日：2021-08-17
Applicant: Rensselaer Polytechnic Institute
Inventor： Ge Wang , Lars Arne Gjesteby , Hongming Shan
CPC classification number: G06T7/0014 , G06T5/002 , G06T5/005 , G06T2207/10081 , G06T2207/20081 , G06T2207/20084 , G06T2207/30052
Abstract: Training a CNN with pseudo ground truth for CT artifact reduction is described. An estimated ground truth apparatus is configured to generate an estimated ground truth image based, at least in part, on an initial CT image that includes an artifact. Feature addition circuitry is configured to add a respective feature to each of a number, N, copies of the estimated ground truth image to create the number, N, initial training images. A computed tomography (CT) simulation circuitry is configured to generate a plurality of simulated training CT images based, at least in part, on at least some of the N initial training images. An artifact reduction circuitry is configured to generate a plurality of input training CT images based, at least in part, on the simulated training CT images. A CNN training circuitry is configured to train the CNN based, at least in part, on the input training CT images and based, at least in part, on the initial training images.
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公开(公告)号：US11592406B2
公开(公告)日：2023-02-28
申请号：US17711171
申请日：2022-04-01
Applicant: RENSSELAER POLYTECHNIC INSTITUTE
Inventor： Ge Wang , Guang Li , Wenxiang Cong
IPC: G01N23/201 , G01N23/20008 , A61B6/00
Abstract: A detection scheme for x-ray small angle scattering is described. An x-ray small angle scattering apparatus may include a first grating and a complementary second grating. The first grating includes a plurality of first grating cells. The complementary second grating includes a plurality of second grating cells. The second grating is positioned relative to the first grating. A configuration of the first grating, a configuration of the second grating and the relative positioning of the gratings are configured to pass one or more small angle scattered photons and to block one or more Compton scattered photons and one or more main x-ray photons.
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公开(公告)号：US11589834B2
公开(公告)日：2023-02-28
申请号：US16978258
申请日：2019-03-06
Applicant: RENSSELAER POLYTECHNIC INSTITUTE
Inventor： Ge Wang , Lars Arne Gjesteby , Qingsong Yang , Hongming Shan
Abstract: A deep neural network for metal artifact reduction is described. A method for computed tomography (CT) metal artifact reduction (MAR) includes generating, by a projection completion circuitry, an intermediate CT image data based, at least in part, on input CT projection data. The intermediate CT image data is configured to include relatively fewer artifacts than an uncorrected CT image reconstructed from the input CT projection data. The method further includes generating, by an artificial neural network (ANN), CT output image data based, at least in part, on the intermediate CT image data. The CT output image data is configured to include relatively fewer artifacts compared to the intermediate CT image data. The method may further include generating, by detail image circuitry, detail CT image data based, at least in part, on input CT image data. The CT output image data is generated based, at least in part, on the detail CT image data.
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公开(公告)号：US20220221413A1
公开(公告)日：2022-07-14
申请号：US17711171
申请日：2022-04-01
Applicant: RENSSELAER POLYTECHNIC INSTITUTE
Inventor： Ge Wang , Guang Li , Wenxiang Cong
IPC: G01N23/20008 , G01N23/201 , G21K1/02 , A61B6/03 , G01N23/046
Abstract: A detection scheme for x-ray small angle scattering is described. An x-ray small angle scattering apparatus may include a first grating and a complementary second grating. The first grating includes a plurality of first grating cells. The complementary second grating includes a plurality of second grating cells. The second grating is positioned relative to the first grating. A configuration of the first grating, a configuration of the second grating and the relative positioning of the gratings are configured to pass one or more small angle scattered photons and to block one or more Compton scattered photons and one or more main x-ray photons.
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公开(公告)号：US11278250B2
公开(公告)日：2022-03-22
申请号：US15775906
申请日：2016-11-14
Applicant: Rensselaer Polytechnic Institute
Inventor： Ge Wang , Lars Arne Gjesteby
IPC: G01R33/48 , A61B6/00 , A61B5/055 , G01R33/381 , G01R33/383 , A61B5/00 , A61B6/02 , A61B6/03
Abstract: Systems and methods for obtaining simultaneous X-ray-magnetic resonance imaging (MRI) images are provided. A magnetic resonance X-ray CT (MRX) system can combine X-ray imaging and MRI in a cost-effective and relatively simple solution for improved imaging. During imaging of a subject, the X-ray source and X-ray detector can be simultaneously rotated around the subject, and the means for generating a magnetic field can also be rotated around the subject. The means for generating a magnetic field can be a plurality of permanent magnets.
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