公开(公告)号：US20190261930A1

公开(公告)日：2019-08-29

申请号：US16347828

申请日：2017-11-07

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Qingsong Yang ,  Wenxiang Cong

IPC: A61B6/03 ,  A61B5/055 ,  A61B6/00

Abstract: Methods and systems for stationary computed tomography are disclosed. The methods and systems include a gantry having alternating x-ray sources and x-ray detectors that are stationary during operation of the system. The gantry and pairs of x-ray sources and detectors substantially surrounds an object positioned inside the gantry during operation of the system. Dynamically adjustable collimators are positioned between the x-ray sources and the object. Each of the x-ray sources projects an x-ray beam through the collimators and through the object and the x-ray detectors receive the x-ray beam. The x-ray detectors include means for converting the x-ray beam to raw image data. One or more microprocessors control the x-ray sources and the process raw image data. A data storage device stores instructions, which upon execution by the microprocessor, control the x-ray sources and process the raw image data by converting the raw image data to a digital image.

公开(公告)号：US20180353147A1

公开(公告)日：2018-12-13

申请号：US15579394

申请日：2016-06-06

Applicant: RENSSELAER POLYTECHNIC INSTITUTE

Inventor： Ge Wang ,  Qingsong Yang ,  Wenxiang Cong

IPC: A61B6/00 ,  A61B6/03 ,  G06T11/00 ,  G21H5/02

CPC classification number: A61B6/5205 ,  A61B6/037 ,  A61B6/481 ,  A61B6/5258 ,  G06T11/003 ,  G06T11/005 ,  G21H5/02

Abstract: Systems and methods for determining an attenuation sinogram for a time-of-flight (TOF) positron emission tomography (PET) scan using only TOF PET data, and including use of the total amount of tracer provided to the subject of the TOF PET scan, are provided. The total amount of injected tracer can be used to determine the otherwise unknown constant shift present when an attenuation sinogram is estimated using the gradient of the attenuation sinogram. The attenuation sinogram can therefore be accurately and stably determined without any additional knowledge on the attenuation sinogram or map.

公开(公告)号：US20180325477A1

公开(公告)日：2018-11-15

申请号：US15775906

申请日：2016-11-14

Applicant: Rensselaer Polytechnic Institute

Inventor： Ge Wang ,  Lars Arne Gjesteby

IPC: A61B6/00 ,  A61B5/055 ,  A61B6/02 ,  A61B6/03 ,  A61B5/00 ,  G01R33/383 ,  G01R33/381 ,  G01R33/48

CPC classification number: A61B6/4417 ,  A61B5/0035 ,  A61B5/055 ,  A61B6/027 ,  A61B6/032 ,  A61B6/5217 ,  A61B6/5247 ,  G01R33/381 ,  G01R33/383 ,  G01R33/4812

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.

公开(公告)号：US20180192981A1

公开(公告)日：2018-07-12

申请号：US15741047

申请日：2016-07-27

Applicant: Rensselaer Polytechnic Institute

Inventor： Ge Wang ,  Wenxiang Cong

IPC: A61B6/00

CPC classification number: A61B6/484 ,  A61B6/032 ,  A61B6/4007 ,  A61B6/4021 ,  A61B6/4028 ,  A61B6/4035 ,  A61B6/405 ,  A61B6/4064 ,  A61B6/4225 ,  A61B6/4233 ,  A61B6/4241 ,  A61B6/4291 ,  G21K2207/005 ,  H01J29/488 ,  H01J35/14

Abstract: Novel and advantageous systems and methods for performing X-ray imaging by using an X-ray source with source grating functionality incorporated therein are provided. An electron beam can be electromagnetically manipulated such that the X-ray source emits radiation in a pattern that is the same as if the radiation had already passed through a source grating.

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.