公开(公告)号：US09514549B2

公开(公告)日：2016-12-06

申请号：US14748935

申请日：2015-06-24

Applicant: Institute for Basic Science

Inventor： Sung Whan Kim ,  Ki Wan Jeon ,  Chi Young Ahn

IPC: G06K9/00 ,  G06T11/00 ,  A61B6/03 ,  A61B6/00 ,  G06T7/00 ,  G06T5/00

CPC classification number: G06T11/003 ,  A61B6/032 ,  A61B6/5205 ,  A61B6/5258 ,  A61B6/5264 ,  G06T5/001 ,  G06T7/0012 ,  G06T11/005 ,  G06T2207/10081 ,  G06T2207/30004 ,  G06T2210/41 ,  G06T2211/421

Abstract: A method for reducing metal artifacts in computed tomography (CT) is disclosed. The method for reducing metal artifacts in CT includes: obtaining a sinogram reduced in size from an original sinogram; setting up a linear algebraic equation according to remaining data excluding data damaged by a metal based on the obtained sinogram; restoring a low-resolution image based on the set up linear algebraic equation; calculating a sinogram from the restored low-resolution image; restoring a sinogram by disposing the calculated sinogram data in the original sinogram and by utilizing the calculated sinogram data as pre-information; and restoring a final CT image from the restored sinogram. Through introduction of a novel metal artifact reduction (MAR) technique referred to as an algebraic correction technique (ACT) using an intermediate image of an attenuation coefficient of an outside of a metal area, an image closest to an original image can be obtained by minimizing metal artifacts in CT.

Abstract translation: 公开了一种在计算机断层摄影（CT）中减少金属伪影的方法。 降低CT中金属伪影的方法包括：从原始正弦图获得尺寸减小的正弦图; 根据剩余的数据建立线性代数方程，不包括基于获得的正弦图的金属损坏的数据; 基于建立的线性代数方程恢复低分辨率图像; 从恢复的低分辨率图像中计算正弦图; 通过将计算的正弦图数据放置在原始正弦图中并通过利用计算的正弦图数据作为预信息来恢复正弦图; 并从恢复的正弦图恢复最终CT图像。 通过引入使用金属区域的外部的衰减系数的中间图像被称为代数校正技术（ACT）的新颖的金属伪影减少（MAR）技术，可以通过最小化最小化原始图像的图像来获得最接近原始图像的图像 CT中的金属文物。

公开(公告)号：US09354187B2

公开(公告)日：2016-05-31

申请号：US14538150

申请日：2014-11-11

Applicant: INSTITUTE FOR BASIC SCIENCE

Inventor： Ki Wan Jeon ,  Chi Young Ahn ,  Sung Whan Kim

IPC: G06K9/00 ,  G01N23/04 ,  G06T11/00

CPC classification number: G01N23/046 ,  G06T11/003 ,  G06T11/005 ,  G06T2211/408

Abstract: An apparatus and method for computed tomography image processing is provided. The apparatus includes: an X-ray detection unit that detects an X-ray beam having passed through a subject and outputs an energy value thereof; a line integral calculation unit that calculates line integral values of attenuation coefficients representing attenuation of the energy value of the X-ray beam having passed through the subject and been detected, based on the energy value; an image processing unit that reconstructs a tomogram based on the line integral values; and an image output unit that outputs the tomogram. The apparatus and method for computed tomography image processing can calculate line integral values of attenuation coefficients constituting an integrand of an X-ray projection function using the mean value theorem for integrals in order to restore an image of a subject from an X-ray beam detected in computed tomography image processing.

Abstract translation: 提供了一种用于计算机断层摄影图像处理的装置和方法。 该装置包括：X射线检测单元，其检测通过被检体的X射线束，并输出其能量值; 线积分计算单元，其基于能量值计算表示已经通过被检体并被检测的X射线束的能量值的衰减的衰减系数的线积分值; 图像处理单元，其基于线积分值重建断层图像; 以及输出断层图像的图像输出单元。 计算机断层图像处理的装置和方法可以使用积分的平均值定理来计算构成X射线投影函数的被积函数的衰减系数的线积分值，以便从检测到的X射线束恢复被摄体的图像 在计算机断层摄影图像处理中。