公开(公告)号：US08338791B2

公开(公告)日：2012-12-25

申请号：US12665558

申请日：2008-05-23

申请人： Roland Proksa ,  Jens-Peter Schlomka ,  Ewald Roessl ,  Tuvia Liran ,  Aviv Marks

发明人： Roland Proksa ,  Jens-Peter Schlomka ,  Ewald Roessl ,  Tuvia Liran ,  Aviv Marks

IPC分类号： G01J5/02

CPC分类号： G01T1/171

摘要： An apparatus includes a local minimum identifier (408) that identifies a local minimum between overlapping pulses in a signal, wherein the pulses have amplitudes that are indicative of the energy of successively detected photons from a multi-energetic radiation beam by a radiation sensitive detector, and a pulse pile-up error corrector (232) that corrects, based on the local minimum, for a pulse pile-up energy-discrimination error when energy-discriminating the pulses using at least two thresholds corresponding to different energy levels. This technique may reduce spectral error when counting photons at a high count rate.

摘要翻译： 一种装置包括识别信号中重叠脉冲之间的局部最小值的局部最小标识符（408），其中脉冲具有指示由辐射敏感检测器从多能辐射束连续检测到的光子的能量的幅度， 以及脉冲堆积误差校正器（232），其基于局部最小值来校正针对对应于不同能级的至少两个阈值对脉冲进行能量鉴别的脉冲堆积能量鉴别误差。 当以高计数率计数光子时，该技术可能降低光谱误差。

公开(公告)号：US20110096892A1

公开(公告)日：2011-04-28

申请号：US12996985

申请日：2009-06-01

申请人： Peter Forthmann ,  Udo Van Stevendaal ,  Ewald Roessl ,  Michael Grass ,  Roland Proksa ,  Jens-Peter Schlomka

发明人： Peter Forthmann ,  Udo Van Stevendaal ,  Ewald Roessl ,  Michael Grass ,  Roland Proksa ,  Jens-Peter Schlomka

IPC分类号： H05G1/60

CPC分类号： A61B6/405 ,  A61B6/032 ,  A61B6/4014 ,  A61B6/4035 ,  A61B6/4042 ,  A61B6/4241 ,  A61B6/482

摘要： An imaging system includes a radiation source (106, T1, T2, T3) that rotates about an examination region and emits radiation that traverses the examination region. The radiation source (106, T1, T2, T3) emits radiation having an energy spectrum that is selectively alternately switched between at least two different energy spectra during an imaging procedure. The system further includes an energy-resolving detector array (116, D1, D2, D3) that detects radiation traversing the examination region. The energy-resolving detector array (116, D1, D2, D3) resolves the detected radiation over at least two different energy ranges and produces energy-resolved output signals as a function of both emission energy spectrum and energy range. The system further includes a reconstructor (126) that performs a spectral reconstruction of the energy-resolved output signals. In another embodiment, the detector array (116) includes a photon-counting detector array (116).

摘要翻译： 成像系统包括围绕检查区域旋转并且发射穿过检查区域的辐射的辐射源（106，T1，T2，T3）。 辐射源（106，T1，T2，T3）发射具有在成像过程期间在至少两个不同能量谱之间选择性交替切换的能谱的辐射。 该系统还包括检测穿过检查区域的辐射的能量分辨检测器阵列（116，D1，D2，D3）。 能量分辨检测器阵列（116，D1，D2，D3）通过至少两个不同的能量范围来解析检测到的辐射，并且产生作为发射能量谱和能量范围的函数的能量分辨的输出信号。 该系统还包括执行能量分辨输出信号的频谱重建的重建器（126）。 在另一个实施例中，检测器阵列（116）包括光子计数检测器阵列（116）。

公开(公告)号：US08442184B2

公开(公告)日：2013-05-14

申请号：US12996985

申请日：2009-06-01

申请人： Peter Forthmann ,  Udo Van Stevendaal ,  Ewald Roessl ,  Michael Grass ,  Roland Proksa ,  Jens-Peter Schlomka

发明人： Peter Forthmann ,  Udo Van Stevendaal ,  Ewald Roessl ,  Michael Grass ,  Roland Proksa ,  Jens-Peter Schlomka

IPC分类号： A61B6/00

CPC分类号： A61B6/405 ,  A61B6/032 ,  A61B6/4014 ,  A61B6/4035 ,  A61B6/4042 ,  A61B6/4241 ,  A61B6/482

摘要： An imaging system includes a radiation source (106, T1, T2, T3) that rotates about an examination region and emits radiation that traverses the examination region. The radiation source (106, T1, T2, T3) emits radiation having an energy spectrum that is selectively alternately switched between at least two different energy spectra during an imaging procedure. The system further includes an energy-resolving detector array (116, D1, D2, D3) that detects radiation traversing the examination region. The energy-resolving detector array (116, D1, D2, D3) resolves the detected radiation over at least two different energy ranges and produces energy-resolved output signals as a function of both emission energy spectrum and energy range. The system further includes a reconstructor (126) that performs a spectral reconstruction of the energy-resolved output signals. In another embodiment, the detector array (116) includes a photon-counting detector array (116).

摘要翻译： 成像系统包括围绕检查区域旋转并且发射穿过检查区域的辐射的辐射源（106，T1，T2，T3）。 辐射源（106，T1，T2，T3）发射具有在成像过程期间在至少两个不同能量谱之间选择性交替切换的能谱的辐射。 该系统还包括检测穿过检查区域的辐射的能量分辨检测器阵列（116，D1，D2，D3）。 能量分辨检测器阵列（116，D1，D2，D3）通过至少两个不同的能量范围来解析检测到的辐射，并且产生作为发射能量谱和能量范围的函数的能量分辨的输出信号。 该系统还包括执行能量分辨输出信号的频谱重建的重建器（126）。 在另一个实施例中，检测器阵列（116）包括光子计数检测器阵列（116）。

公开(公告)号：US08213566B2

公开(公告)日：2012-07-03

申请号：US13000371

申请日：2009-06-22

申请人： Ewald Roessl ,  Roland Proksa ,  Jens-Peter Schlomka

发明人： Ewald Roessl ,  Roland Proksa ,  Jens-Peter Schlomka

IPC分类号： A61B6/00 ,  G06K9/00

CPC分类号： G01N23/087 ,  A61B5/4869 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/481 ,  A61B6/482

摘要： An imaging system including a radiation source (110) that emits poly-chromatic radiation that traverses an examination region and a detector (116) that detects radiation traversing the examination region and produces a signal indicative of the energy of a detected photon. The system further includes an energy discriminator (122) that energy resolves the signal based on a plurality of different energy thresholds, wherein at least two of the energy thresholds have values corresponding to at least two different K-edge energies of two different elements in a mixture disposed in the examination region. The system also includes a signal decomposer (132) that decomposes the energy-resolved signal into at least a multi K-edge component representing the at least two different K-edge energies. In one instance, a stoichiometric ratio of the two different elements in the contrast agent is known and substantially constant.

摘要翻译： 一种成像系统，包括发射穿过检查区域的多色辐射的辐射源（110）和检测穿过检查区域的辐射的检测器（116），并产生指示检测到的光子的能量的信号。 所述系统还包括能量鉴别器（122），所述能量鉴别器（122）能量基于多个不同的能量阈值来解析所述信号，其中所述能量阈值中的至少两个具有对应于两个不同元素的至少两个不同K边能量的值 混合物置于检查区域。 该系统还包括信号分解器（132），其将能量分辨信号分解成代表至少两个不同的K边缘能量的至少多个K边缘分量。 在一种情况下，造影剂中两种不同元素的化学计量比是已知的并且基本上是恒定的。

公开(公告)号：US20110096905A1

公开(公告)日：2011-04-28

申请号：US13000371

申请日：2009-06-22

申请人： Ewald Roessl ,  Roland Proksa ,  Jens-Peter Schlomka

发明人： Ewald Roessl ,  Roland Proksa ,  Jens-Peter Schlomka

IPC分类号： G01N23/04

CPC分类号： G01N23/087 ,  A61B5/4869 ,  A61B6/032 ,  A61B6/4241 ,  A61B6/481 ,  A61B6/482

摘要： An imaging system including a radiation source (110) that emits poly-chromatic radiation that traverses an examination region and a detector (116) that detects radiation traversing the examination region and produces a signal indicative of the energy of a detected photon. The system further includes an energy discriminator (122) that energy resolves the signal based on a plurality of different energy thresholds, wherein at least two of the energy thresholds have values corresponding to at least two different K-edge energies of two different elements in a mixture disposed in the examination region. The system also includes a signal decomposer (132) that decomposes the energy-resolved signal into at least a multi K-edge component representing the at least two different K-edge energies. In one instance, a stoichiometric ratio of the two different elements in the contrast agent is known and substantially constant.

摘要翻译： 一种成像系统，包括发射穿过检查区域的多色辐射的辐射源（110）和检测穿过检查区域的辐射的检测器（116），并产生指示检测到的光子的能量的信号。 所述系统还包括能量鉴别器（122），所述能量鉴别器（122）能量基于多个不同的能量阈值来解析所述信号，其中所述能量阈值中的至少两个具有对应于两个不同元素的至少两个不同K边能量的值 混合物置于检查区域。 该系统还包括信号分解器（132），其将能量分辨信号分解成代表至少两个不同的K边缘能量的至少多个K边缘分量。 在一种情况下，造影剂中两种不同元素的化学计量比是已知的并且基本上是恒定的。

公开(公告)号：US20110012014A1

公开(公告)日：2011-01-20

申请号：US12934661

申请日：2009-03-20

申请人： Amir Livne ,  Naor Wainer ,  Jens-Peter Schlomka ,  Ewald Roessl ,  Roland Proksa

发明人： Amir Livne ,  Naor Wainer ,  Jens-Peter Schlomka ,  Ewald Roessl ,  Roland Proksa

IPC分类号： G01D18/00

CPC分类号： G01T7/005 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4042 ,  A61B6/4441 ,  A61B6/482 ,  A61B6/585 ,  G01N2223/3037 ,  G01T1/1647

摘要： A method includes detecting radiation that traverses a material having a known spectral characteristic with a radiation sensitive detector pixel that outputs a signal indicative of the detected radiation and determining a mapping between the output signal and the spectral characteristic. The method further includes determining an energy of a photon detected by the radiation sensitive detector pixel based on a corresponding output of the radiation sensitive detector pixel and the mapping.

摘要翻译： 一种方法包括利用辐射敏感检测器像素检测穿过具有已知光谱特性的材料的辐射，所述辐射敏感检测器像素输出指示检测到的辐射的信号并确定输出信号和光谱特性之间的映射。 该方法还包括基于辐射敏感检测器像素的对应输出和映射来确定由辐射敏感检测器像素检测到的光子的能量。

公开(公告)号：US08585286B2

公开(公告)日：2013-11-19

申请号：US12934661

申请日：2009-03-20

申请人： Amir Livne ,  Naor Wainer ,  Jens-Peter Schlomka ,  Ewald Roessl ,  Roland Proksa

发明人： Amir Livne ,  Naor Wainer ,  Jens-Peter Schlomka ,  Ewald Roessl ,  Roland Proksa

IPC分类号： G01D18/00

CPC分类号： G01T7/005 ,  A61B6/032 ,  A61B6/4035 ,  A61B6/4042 ,  A61B6/4441 ,  A61B6/482 ,  A61B6/585 ,  G01N2223/3037 ,  G01T1/1647

摘要： A method includes detecting radiation that traverses a material having a known spectral characteristic with a radiation sensitive detector pixel that outputs a signal indicative of the detected radiation and determining a mapping between the output signal and the spectral characteristic. The method further includes determining an energy of a photon detected by the radiation sensitive detector pixel based on a corresponding output of the radiation sensitive detector pixel and the mapping.

摘要翻译： 一种方法包括利用辐射敏感检测器像素检测穿过具有已知光谱特性的材料的辐射，所述辐射敏感检测器像素输出指示检测到的辐射的信号并确定输出信号和光谱特性之间的映射。 该方法还包括基于辐射敏感检测器像素的对应输出和映射来确定由辐射敏感检测器像素检测到的光子的能量。

公开(公告)号：US08861674B2

公开(公告)日：2014-10-14

申请号：US13509840

申请日：2010-12-10

申请人： Thomas Koehler ,  Roland Proksa ,  Ewald Roessl

发明人： Thomas Koehler ,  Roland Proksa ,  Ewald Roessl

IPC分类号： A61B6/00 ,  A61B6/03 ,  G01N23/04 ,  G06T11/00

CPC分类号： A61B6/032 ,  A61B6/469 ,  A61B6/542 ,  G01N23/046 ,  G01N2223/419 ,  G06T11/005 ,  Y10S378/901

摘要： The invention relates to a computed tomography apparatus for imaging an object. The computed tomography apparatus comprises a radiation source (2) for generating modulated radiation (4) traversing the object and a detector (6) for generating detection values depending on the radiation (4) after having traversed the object, while the radiation source (2) and the object are moved relative to each other. A weight providing unit (14) provides modulation weights for weighting the detection values depending on the modulation of the radiation (4) and a reconstruction unit (15) reconstructs an image of the object, wherein the detection values are weighted based on the provided modulation weights and an image of the object is reconstructed from the weighted detection values. This can allow to optimize the dose application to the object by modulating the radiation accordingly, wherein the reconstructed images still have a high quality.

摘要翻译： 本发明涉及一种用于对物体成像的计算机断层摄影装置。 计算机断层摄影装置包括用于产生经过物体的调制辐射（4）的辐射源（2）和用于在穿过物体之后产生取决于辐射（4）的检测值的检测器（6），而辐射源 ）并且对象相对于彼此移动。 权重提供单元（14）根据辐射（4）的调制提供用于对检测值进行加权的调制权重，并且重建单元（15）重建对象的图像，其中基于所提供的调制对所述检测值进行加权 从加权检测值重建对象的权重和图像。 这可以通过相应地调节辐射来优化对物体的剂量应用，其中重建的图像仍然具有高质量。

公开(公告)号：US20140005971A1

公开(公告)日：2014-01-02

申请号：US14005041

申请日：2012-03-02

申请人： Ewald Roessl ,  Roland Proksa

发明人： Ewald Roessl ,  Roland Proksa

IPC分类号： G01T7/00

CPC分类号： G01T7/005 ,  G06T11/005 ,  G06T2211/408

摘要： A method for processing projection data in the projection domain includes receiving the projection data. The projection data is generated by a spectral detector and includes two or more independent energy-resolved measurements in which at least one of the two or more measurements has first photon statistics. The method further includes generating a de-noised measurement in electronic format for the at least one of the two or more measurements having the first photon statistics. The de-noised measurement has second photon statistics which are better than the first photon statistics.

摘要翻译： 用于处理投影域中的投影数据的方法包括接收投影数据。 投影数据由光谱检测器产生，并且包括两个或多个独立的能量分辨测量，其中两个或更多个测量中的至少一个具有第一光子统计。 该方法还包括以电子格式生成具有第一光子统计量的两个或多个测量中的至少一个的去噪测量。 去噪测量具有比第一光子统计更好的第二光子统计。

公开(公告)号：US20120250821A1

公开(公告)日：2012-10-04

申请号：US13509840

申请日：2010-12-10

申请人： Thomas Koehler ,  Roland Proksa ,  Ewald Roessl

发明人： Thomas Koehler ,  Roland Proksa ,  Ewald Roessl

IPC分类号： G01N23/04

CPC分类号： A61B6/032 ,  A61B6/469 ,  A61B6/542 ,  G01N23/046 ,  G01N2223/419 ,  G06T11/005 ,  Y10S378/901

摘要： The invention relates to a computed tomography apparatus for imaging an object. The computed tomography apparatus comprises a radiation source (2) for generating modulated radiation (4) traversing the object and a detector (6) for generating detection values depending on the radiation (4) after having traversed the object, while the radiation source (2) and the object are moved relative to each other. A weight providing unit (14) provides modulation weights for weighting the detection values depending on the modulation of the radiation (4) and a reconstruction unit (15) reconstructs an image of the object, wherein the detection values are weighted based on the provided modulation weights and an image of the object is reconstructed from the weighted detection values. This can allow to optimize the dose application to the object by modulating the radiation accordingly, wherein the reconstructed images still have a high quality.

摘要翻译： 本发明涉及一种用于对物体成像的计算机断层摄影装置。 计算机断层摄影装置包括用于产生经过物体的调制辐射（4）的辐射源（2）和用于在穿过物体之后产生取决于辐射（4）的检测值的检测器（6），而辐射源 ）并且对象相对于彼此移动。 权重提供单元（14）根据辐射（4）的调制提供用于对检测值进行加权的调制权重，并且重建单元（15）重建对象的图像，其中基于所提供的调制对所述检测值进行加权 从加权检测值重建对象的权重和图像。 这可以通过相应地调节辐射来优化对物体的剂量应用，其中重建的图像仍然具有高质量。