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.