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1. 发明授权

US08503750B2 Method and apparatus for reduction of metal artifacts in CT images 有权
标题翻译：减少CT图像中金属伪影的方法和装置
公开(公告)号：US08503750B2
公开(公告)日：2013-08-06
申请号：US12574502
申请日：2009-10-06
申请人： Thomas Matthew Benson , Naveen Chandra , David Allen Langan
发明人： Thomas Matthew Benson , Naveen Chandra , David Allen Langan
IPC分类号： A61B6/03
CPC分类号： G06T11/005 , A61B6/5258
摘要： A method and apparatus include acquisition of a view dataset based on x-rays received by a detector corresponding to a energy level, reconstruction of an initial image using the view dataset, the initial image comprising a plurality of metal voxels at respective metal voxel locations, and generation of a metal mask corresponding to the plurality of metal voxels within the initial image. The method and apparatus also include forward projection of the metal mask onto the view dataset to identify metal dexels in the view dataset, performance of a weighted interpolation based on the identified metal dexels to generate a completed view dataset, reconstruction of a final image using the completed view dataset, the final image comprising a plurality of image voxels corresponding to the metal voxel locations, and replacement of a portion of the plurality of image voxels corresponding to the metal voxel locations with smoothed metal values.
摘要翻译：一种方法和装置包括：基于由能量级对应的检测器接收的X射线获取视图数据集，使用视图数据集重构初始图像，初始图像包括在相应的金属体素位置处的多个金属体素，以及生成与初始图像内的多个金属体素相对应的金属掩模。所述方法和装置还包括将金属掩模向视图数据集向前投影以识别视图数据集中的金属像素，基于所识别的金属像素来执行加权内插以生成完整的视图数据集，使用完成的视图数据集，最终图像包括对应于金属体元位置的多个图像体素，以及用平滑的金属值替换与金属体元位置相对应的多个图像体素的一部分。

2. 发明申请

US20110081071A1 METHOD AND APPARATUS FOR REDUCTION OF METAL ARTIFACTS IN CT IMAGES 有权
标题翻译：用于减少CT图像中金属制品的方法和装置
公开(公告)号：US20110081071A1
公开(公告)日：2011-04-07
申请号：US12574502
申请日：2009-10-06
申请人： Thomas Matthew Benson , Naveen Chandra , David Allen Langan
发明人： Thomas Matthew Benson , Naveen Chandra , David Allen Langan
IPC分类号： G06K9/00
CPC分类号： G06T11/005 , A61B6/5258
摘要： A method and apparatus include acquisition of a view dataset based on x-rays received by a detector corresponding to a energy level, reconstruction of an initial image using the view dataset, the initial image comprising a plurality of metal voxels at respective metal voxel locations, and generation of a metal mask corresponding to the plurality of metal voxels within the initial image. The method and apparatus also include forward projection of the metal mask onto the view dataset to identify metal dexels in the view dataset, performance of a weighted interpolation based on the identified metal dexels to generate a completed view dataset, reconstruction of a final image using the completed view dataset, the final image comprising a plurality of image voxels corresponding to the metal voxel locations, and replacement of a portion of the plurality of image voxels corresponding to the metal voxel locations with smoothed metal values.
摘要翻译：一种方法和装置包括：基于由能量级对应的检测器接收的X射线获取视图数据集，使用视图数据集重构初始图像，初始图像包括在相应的金属体素位置处的多个金属体素，以及生成与初始图像内的多个金属体素相对应的金属掩模。所述方法和装置还包括将金属掩模向视图数据集向前投影以识别视图数据集中的金属像素，基于所识别的金属像素来执行加权内插以生成完整的视图数据集，使用完成的视图数据集，最终图像包括对应于金属体元位置的多个图像体素，以及用平滑的金属值替换与金属体元位置相对应的多个图像体素的一部分。

3. 发明申请

US20110150183A1 DUAL-ENERGY IMAGING AT REDUCED SAMPLE RATES 有权
标题翻译：降低采样率的双能量成像
公开(公告)号：US20110150183A1
公开(公告)日：2011-06-23
申请号：US12962972
申请日：2010-12-08
申请人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lia , Dan Xu , Thomas Matthew Benson
发明人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lia , Dan Xu , Thomas Matthew Benson
IPC分类号： H05G1/64
CPC分类号： A61B6/4241 , A61B6/032 , A61B6/405 , A61B6/482 , A61B6/505 , G06T11/005 , G06T2211/408
摘要： The present disclosure relates to the generation of dual-energy X-ray data using a data sampling rate comparable to the rate utilized for single-energy imaging. In accordance with the present technique a reduced kVp switching rate is employed compared to conventional dual-energy imaging. Full angular resolution is achieved in the generated images.
摘要翻译：本公开涉及使用与用于单能量成像的速率相当的数据采样率来生成双能量X射线数据。根据本技术，与传统的双能量成像相比，采用了降低的kVp开关速率。在生成的图像中实现全角度分辨率。

4. 发明授权

US08160206B2 Dual-energy imaging at reduced sample rates 有权
标题翻译：降低采样率的双能量成像
公开(公告)号：US08160206B2
公开(公告)日：2012-04-17
申请号：US12962972
申请日：2010-12-08
申请人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lai , Dan Xu , Thomas Matthew Benson
发明人： Xiaoye Wu , David Allen Langan , Jiang Hsieh , Robert Franklin Senzig , Hao Lai , Dan Xu , Thomas Matthew Benson
IPC分类号： H05G1/64
CPC分类号： A61B6/4241 , A61B6/032 , A61B6/405 , A61B6/482 , A61B6/505 , G06T11/005 , G06T2211/408
摘要： The present disclosure relates to the generation of dual-energy X-ray data using a data sampling rate comparable to the rate utilized for single-energy imaging. In accordance with the present technique a reduced kVp switching rate is employed compared to conventional dual-energy imaging. Full angular resolution is achieved in the generated images.
摘要翻译：本公开涉及使用与用于单能量成像的速率相当的数据采样率来生成双能量X射线数据。根据本技术，与传统的双能量成像相比，采用了降低的kVp开关速率。在生成的图像中实现全角度分辨率。

5. 发明授权

US07826587B1 System and method of fast kVp switching for dual energy CT 有权
标题翻译：双能CT快速kVp开关系统及方法
公开(公告)号：US07826587B1
公开(公告)日：2010-11-02
申请号：US12558248
申请日：2009-09-11
申请人： David Allen Langan , John Eric Tkaczyk , James Walter LeBlanc , Colin R. Wilson , Xiaoye Wu , Dan Xu , Thomas Matthew Benson , Jed Douglas Pack
发明人： David Allen Langan , John Eric Tkaczyk , James Walter LeBlanc , Colin R. Wilson , Xiaoye Wu , Dan Xu , Thomas Matthew Benson , Jed Douglas Pack
IPC分类号： H05G1/60
CPC分类号： A61B6/405 , A61B6/032 , A61B6/482
摘要： A CT system includes a gantry, an x-ray source, a generator configured to energize the x-ray source to a first kVp and to a second kVp, a detector, and a controller. The controller is configured energize the x-ray source to the first kVp for a first time period, subsequently energize the x-ray source to the second kVp for a second time period, integrate data for a first integration period that includes a portion of a steady-state period of the x-ray source at the first kVp, integrate data for a second integration period that includes a portion of a steady-state period of the x-ray source at the second kVp, compare a signal-to-noise ratio (SNR) during the first integration period (SNRH) and the second integration period (SNRL), adjust an operating parameter of the CT system to optimize an SNRH with SNRL, and generate an image using the integrated data.
摘要翻译： CT系统包括台架，x射线源，被配置为将x射线源激发到第一kVp的发生器和到第二kVp的检测器和控制器的发生器。控制器被配置为在第一时间段内将x射线源激励到第一kVp，随后将x射线源激励到第二kVp第二时间段，将包含第一时间段的第一积分周期的数据整合在第一kVp处的x射线源的稳态周期，将包括X射线源的稳态周期的一部分的第二积分周期的数据集成在第二kVp处，比较信号与噪声在第一积分周期（SNRH）和第二积分周期（SNRL）期间的比率（SNR），调整CT系统的运行参数以利用SNRL优化SNRH，并使用积分数据生成图像。

6. 发明申请

US20120308099A1 METHOD AND SYSTEM FOR RECONSTRUCTION OF TOMOGRAPHIC IMAGES 有权
标题翻译：重建图像图像的方法和系统
公开(公告)号：US20120308099A1
公开(公告)日：2012-12-06
申请号：US13149698
申请日：2011-05-31
申请人： Thomas Matthew Benson , Bruno Kristiaan Bernard DeMan
发明人： Thomas Matthew Benson , Bruno Kristiaan Bernard DeMan
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , G06T2211/424 , G06T2211/432
摘要： Approaches are described for addressing artifacts associated with iterative reconstruction of image data acquired using a cone-beam CT system. Such approaches include, but are not limited to, the use of asymmetric regularization during iterative reconstruction, the modulation of regularization strength for certain voxels, the modification of statistical weights, and/or the generation and use of synthesized data.
摘要翻译：描述了用于寻址与使用锥束CT系统获取的图像数据的迭代重建相关联的伪影的方法。这些方法包括但不限于在迭代重建期间使用不对称正则化，对于某些体素的正则化强度的调制，统计权重的修改和/或合成数据的生成和使用。

7. 发明申请

US20120155728A1 TOMOGRAPHIC ITERATIVE RECONSTRUCTION 有权
标题翻译： TOMOGRAPHIC迭代重建
公开(公告)号：US20120155728A1
公开(公告)日：2012-06-21
申请号：US12973649
申请日：2010-12-20
申请人： Bruno Kristiaan Bernard DeMan , Thomas Matthew Benson , Lin Fu
发明人： Bruno Kristiaan Bernard DeMan , Thomas Matthew Benson , Lin Fu
IPC分类号： G06K9/00
CPC分类号： G06T11/006 , G06T2211/424
摘要： The present disclosure relates to iterative reconstruction of images. In certain embodiments, a deconvolution filter is used to approximate the inversion of a Hessian matrix associated with the reconstruction. In one such embodiment, the desired image is not reconstructed directly in the iterative process. Instead, an image is reconstructed that yields the desired image when filtered by the deconvolution filter.
摘要翻译：本公开涉及图像的迭代重建。在某些实施例中，使用去卷积滤波器近似与重建相关联的赫西矩阵的反演。在一个这样的实施例中，期望的图像不是在迭代过程中直接重构。相反，重构图像，其通过去卷积滤波器滤波时产生期望的图像。

8. 发明申请

US20110262054A1 SYSTEM AND METHOD FOR ITERATIVE IMAGE RECONSTRUCTION 有权
标题翻译：用于迭代图像重建的系统和方法
公开(公告)号：US20110262054A1
公开(公告)日：2011-10-27
申请号：US13174461
申请日：2011-06-30
申请人： Thomas Matthew Benson , Bruno Kristiaan Bernard DeMan , Lin Fu
发明人： Thomas Matthew Benson , Bruno Kristiaan Bernard DeMan , Lin Fu
IPC分类号： G06K9/40
CPC分类号： G01N23/046 , A61B6/03 , G01N2223/419 , G06T11/006 , G06T2211/424
摘要： Methods are provided for iteratively reconstructing an image signal to generate a reconstructed image signal. In one embodiment, sub-iterations of each iteration are performed on pixel or voxel subsets. The subsets may be composed of neighboring or spatially separated pixel or voxels and may extend in the z-direction. In one embodiment, an update step of the iterative reconstruction involves the direct inversion of an approximation of a Hessian matrix associated with the respective subsets. In further embodiments, non-negativity or other limitations or constraints on update values may be enforced.
摘要翻译：提供了用于迭代重建图像信号以产生重建图像信号的方法。在一个实施例中，对像素或体素子集执行每次迭代的子迭代。子集可以由相邻或空间上分离的像素或体元组成，并且可以在z方向上延伸。在一个实施例中，迭代重建的更新步骤包括与相应子集相关联的Hessian矩阵的近似的直接反转。在另外的实施例中，可以执行非消极性或对更新值的其他限制或限制。

9. 发明授权

US08867805B2 Method and system for reconstruction of tomographic images 有权
公开(公告)号：US08867805B2
公开(公告)日：2014-10-21
申请号：US13149698
申请日：2011-05-31
申请人： Thomas Matthew Benson , Bruno Kristiaan Bernard DeMan
发明人： Thomas Matthew Benson , Bruno Kristiaan Bernard DeMan
IPC分类号： G06K9/00 , G06T11/00
摘要： Approaches are described for addressing artifacts associated with iterative reconstruction of image data acquired using a cone-beam CT system. Such approaches include, but are not limited to, the use of asymmetric regularization during iterative reconstruction, the modulation of regularization strength for certain voxels, the modification of statistical weights, and/or the generation and use of synthesized data.

10. 发明申请

US20130003914A1 METHOD AND SYSTEM FOR REDUCED DOSE X-RAY IMAGING 有权
标题翻译：用于减少剂量X射线成像的方法和系统
公开(公告)号：US20130003914A1
公开(公告)日：2013-01-03
申请号：US13174438
申请日：2011-06-30
申请人： Zhye Yin , Roy Arnulf Helge Nilsen , Jiahua Fan , Thomas Matthew Benson , Bruno Kristiaan Bernard De Man , Jed Douglas Pack , Kai Zeng
发明人： Zhye Yin , Roy Arnulf Helge Nilsen , Jiahua Fan , Thomas Matthew Benson , Bruno Kristiaan Bernard De Man , Jed Douglas Pack , Kai Zeng
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/06 , A61B6/405 , A61B6/4085 , A61B6/4435 , A61B6/542
摘要： Approaches for acquiring CT image data corresponding to a full scan, but at a reduced dose are disclosed. In one implementation, X-ray tube current modulation is employed to reduce the effective dose. In other implementations, acquisition of sparse views, z-collimation, and two-rotation acquisition protocols may be employed to achieve a reduced dose relative to a full-scan acquisition protocol.
摘要翻译：公开了用于获取对应于全扫描但以减小剂量的CT图像数据的方法。在一个实施方案中，采用X射线管电流调制来降低有效剂量。在其他实施方案中，可采用稀疏视图，z准直和双旋转采集协议的采集来实现相对于全扫描采集协议的减少的剂量。

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