公开(公告)号：US20180068467A1

公开(公告)日：2018-03-08

申请号：US15558053

申请日：2016-03-21

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Mianyi Chen ,  Yan Xi ,  Wenxiang Cong

IPC: G06T11/00 ,  A61B6/00 ,  A61B6/03

CPC classification number: G06T11/005 ,  A61B6/032 ,  A61B6/5205 ,  A61B6/582 ,  G06T11/006 ,  G06T2207/10116 ,  G06T2207/20 ,  G06T2211/412 ,  G06T2211/424

Abstract: Systems and methods for geometric calibration and image reconstruction in computed tomography (CT) scanning using iterative reconstruction algorithms are provided. An iterative reconstruction algorithm can be used to reconstruct an improved image, and then the improved image can be used to adjust inaccurate parameters by using a Locally Linear Embedding (LLE) method. Adjusted parameters can then be used to reconstruct new images, which can then be used to further adjust the parameters. The steps of this iterative process can be repeated until a quality threshold is met.

公开(公告)号：US20240070938A1

公开(公告)日：2024-02-29

申请号：US18238605

申请日：2023-08-28

Applicant: Rensselaer Polytechnic Institute

Inventor： Ge Wang ,  Weiwen Wu ,  Yan Xi

IPC: G06T11/00

CPC classification number: G06T11/008 ,  G06T11/005 ,  G06T2211/412 ,  G06T2211/428 ,  G06T2211/441

Abstract: In one embodiment, there is provided a dynamic multi-source image reconstruction apparatus. The apparatus includes a first reconstruction stage, a second reconstruction stage, and a refinement stage. The first reconstruction stage is configured to receive an input data set including a group of data frames. Each data frame corresponds to a respective time step. Each data frame includes a number of projection data sets. Each projection data set corresponds to a respective source-detector pair of a stationary multi-source tomography system. The first reconstruction stage is further configured to reconstruct a first intermediate image based, at least in part, on the group of data frames. The second reconstruction stage is configured to receive a selected data frame and to reconstruct a second intermediate image with a constraint of the first intermediate image as prior. The refinement stage is configured to refine the second intermediate image to produce a three-dimensional output image.

公开(公告)号：US20220257203A1

公开(公告)日：2022-08-18

申请号：US17734311

申请日：2022-05-02

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Wenxiang Cong ,  Yan Xi

IPC: A61B6/00 ,  A61B6/03

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.

公开(公告)号：US11337663B2

公开(公告)日：2022-05-24

申请号：US16092393

申请日：2017-04-06

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Wenxiang Cong ,  Yan Xi

IPC: A61B6/00 ,  A61B6/03

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.

公开(公告)号：US11020077B2

公开(公告)日：2021-06-01

申请号：US15759326

申请日：2016-09-14

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Yan Xi ,  Wenxiang Cong ,  Jun Zhao

IPC: A61B5/055 ,  A61B6/00 ,  A61B5/00 ,  A61B6/03 ,  G01R33/3815 ,  G01R33/48 ,  G01R33/56 ,  G06T11/00

Abstract: Novel and advantageous systems and method for obtaining and/or reconstructing simultaneous computed tomography (CT)-magnetic resonance imaging (MRI) images are provided. Structural coupling (SC) and compressive sensing (CS) techniques can be combined to unify and improve CT and MRI reconstruction. A bidirectional image estimation method can be used to connect images from different modalities, with CT and MRI data serving as prior knowledge to each other to produce better CT and MRI image quality than would be realized with individual reconstruction.

公开(公告)号：US20170360385A1

公开(公告)日：2017-12-21

申请号：US15538376

申请日：2015-12-22

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Yan Xi ,  Wenxiang Cong ,  Zaifeng Shi

IPC: A61B6/00 ,  A61B6/03 ,  G01T1/29

CPC classification number: A61B6/4233 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/4266 ,  A61B6/4275 ,  A61B6/4291 ,  A61B6/482 ,  A61B6/5205 ,  A61B6/5217 ,  G01T1/2985

Abstract: Novel and advantageous methods and systems for performing spectral computed tomography are provided. An edge-on detector, such as a silicon strip detector, can be used to receive X-rays after passing through a sample to be imaged. An energy resolving process can be performed on the collected X-ray radiation. The CT scanner can have third-generation or fourth-generation geometry.

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

IPC: A61B6/40 ,  A61B6/00 ,  A61B6/03

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.

公开(公告)号：US10548543B2

公开(公告)日：2020-02-04

申请号：US15538376

申请日：2015-12-22

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Yan Xi ,  Wenxiang Cong ,  Zaifeng Shi

IPC: A61B6/00 ,  A61B6/03 ,  G01T1/29

Abstract: Novel and advantageous methods and systems for performing spectral computed tomography are provided. An edge-on detector, such as a silicon strip detector, can be used to receive X-rays after passing through a sample to be imaged. An energy resolving process can be performed on the collected X-ray radiation. The CT scanner can have third-generation or fourth-generation geometry.