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1. 发明授权

US07428290B2 X-ray CT apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：US07428290B2
公开(公告)日：2008-09-23
申请号：US11534126
申请日：2006-09-21
申请人： Akihiko Nishide , Akira Hagiwara , Yasuhiro Imai , Makoto Gohno
发明人： Akihiko Nishide , Akira Hagiwara , Yasuhiro Imai , Makoto Gohno
IPC分类号： H05G1/60
CPC分类号： G01N23/046 , A61B6/027 , A61B6/032 , A61B6/469 , A61B6/583 , G01N2223/419 , G01N2223/612
摘要： The present invention is intended to improve image quality ensured by a conventional (axial) scan, a cine scan, or a helical scan performed by an X-ray CT apparatus including a two-dimensional area X-ray detector that has a matrix structure. In helical scan image reconstruction based in three-dimensional image reconstruction performed in an X-ray CT apparatus including a two-dimensional area X-ray detector that is represented by a multi-array X-ray detector or a flat-panel X-ray detector and that has a matrix structure, an image expressing a slice thickness larger than the width of one detector array included in a multi-array X-ray detector is reconstructed according to either of a method of convoluting a z-direction filter to projection data items in the direction of detector arrays (z direction) and a method of convoluting a filer to a tomographic image space in the z direction. The two methods are optimized in terms of a calculation time and tomographic image quality. Consequently, a tomographic image can be quickly reconstructed with high quality.
摘要翻译：本发明旨在通过包括具有矩阵结构的二维区域X射线检测器的X射线CT装置进行的常规（轴向）扫描，电影扫描或螺旋扫描来提高图像质量。在基于由包括由多阵列X射线检测器或平板X射线检测器表示的二维区域X射线检测器的X射线CT装置中进行的三维图像重构中的螺旋扫描图像重建中，检测器，并且具有矩阵结构，根据包括在多阵列X射线检测器中的一个检测器阵列的宽度的表示切片厚度的图像根据将z方向滤波器卷积到投影数据的方法中的任一种被重建检测器阵列（z方向）的方向的项目以及将扫描器卷绕到z方向上的断层图像空间的方法。这两种方法在计算时间和断层图像质量方面进行了优化。因此，可以以高质量快速重建断层图像。

2. 发明申请

US20070071160A1 X-RAY CT APPARATUS 有权
标题翻译： X射线CT装置
公开(公告)号：US20070071160A1
公开(公告)日：2007-03-29
申请号：US11534126
申请日：2006-09-21
申请人： Akihiko Nishide , Akira Hagiwara , Yasuhiro Imai , Makoto Gohno
发明人： Akihiko Nishide , Akira Hagiwara , Yasuhiro Imai , Makoto Gohno
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
CPC分类号： G01N23/046 , A61B6/027 , A61B6/032 , A61B6/469 , A61B6/583 , G01N2223/419 , G01N2223/612
摘要： The present invention is intended to improve image quality ensured by a conventional (axial) scan, a cine scan, or a helical scan performed by an X-ray CT apparatus including a two-dimensional area X-ray detector that has a matrix structure. In helical scan image reconstruction based in three-dimensional image reconstruction performed in an X-ray CT apparatus including a two-dimensional area X-ray detector that is represented by a multi-array X-ray detector or a flat-panel X-ray detector and that has a matrix structure, an image expressing a slice thickness larger than the width of one detector array included in a multi-array X-ray detector is reconstructed according to either of a method of convoluting a z-direction filter to projection data items in the direction of detector arrays (z direction) and a method of convoluting a filer to a tomographic image space in the z direction. The two methods are optimized in terms of a calculation time and tomographic image quality. Consequently, a tomographic image can be quickly reconstructed with high quality.
摘要翻译：本发明旨在通过包括具有矩阵结构的二维区域X射线检测器的X射线CT装置进行的常规（轴向）扫描，电影扫描或螺旋扫描来提高图像质量。在基于由包括由多阵列X射线检测器或平板X射线检测器表示的二维区域X射线检测器的X射线CT装置中进行的三维图像重构中的螺旋扫描图像重建中，检测器，并且具有矩阵结构，根据包括在多阵列X射线检测器中的一个检测器阵列的宽度的表示切片厚度的图像根据将z方向滤波器卷积到投影数据的方法中的任一种被重建检测器阵列（z方向）的方向的项目以及将扫描器卷绕到z方向上的断层图像空间的方法。这两种方法在计算时间和断层图像质量方面进行了优化。因此，可以以高质量快速重建断层图像。

3. 发明申请

US20070286332A1 X-RAY CT APPARATUS 有权
标题翻译： X射线CT装置
公开(公告)号：US20070286332A1
公开(公告)日：2007-12-13
申请号：US11757732
申请日：2007-06-04
申请人： Makoto Gohno , Tetsuya Horiuchi , Akihiko Nishide , Akira Hagiwara
发明人： Makoto Gohno , Tetsuya Horiuchi , Akihiko Nishide , Akira Hagiwara
IPC分类号： A61B6/00 , G01N23/00 , G21K1/12 , H05G1/60
CPC分类号： A61B6/032 , A61B6/027 , A61B6/488 , A61B6/542 , H05G1/30
摘要： The present invention aims to obtain a tomographic image similar in image quality to a tomographic image obtained by executing a scan at X-ray tube current value set by an X-ray automatic exposure function even when the X-ray tube current value set by the X-ray automatic exposure function are not within a standard range of the X-ray tube current values settable at the X-ray tube (21). X-ray tube current value supplied to the X-ray tube (21) are set by the X-ray automatic exposure function. Thereafter, when the X-ray tube current value set by the X-ray automatic exposure function is not within in the standard range of the X-ray tube current value settable at the X-ray tube, the X-ray tube current value at a portion not within the standard range are changed so as to be within the standard range, and the set value of helical pitch is changed so as to correspond to the ratio between the pre-changed x-ray tube current value and the post-changed X-ray tube current value.
摘要翻译：本发明的目的在于获得与通过由X射线自动曝光功能设定的X射线管电流值执行扫描而获得的断层图像相似的断层图像，即使当由X射线管电流值 X射线自动曝光功能不在X射线管（21）可设定的X射线管电流值的标准范围内。通过X射线自动曝光功能设定供给X射线管（21）的X射线管电流值。此后，当通过X射线自动曝光功能设定的X射线管电流值不在可设置在X射线管的X射线管电流值的标准范围内时，X射线管电流值在不在标准范围内的部分被改变为在标准范围内，并且改变螺距的设定值，以便对应于预先改变的X射线管电流值和后变化的X射线管电流值之间的比率 X射线管电流值。

4. 发明申请

US20070268996A1 RADIATION IMAGING APPARATUS AND RADIATION IMAGING METHOD 审中-公开
标题翻译：辐射成像装置和辐射成像方法
公开(公告)号：US20070268996A1
公开(公告)日：2007-11-22
申请号：US11745597
申请日：2007-07-26
申请人： Akira Hagiwara , Masatake Nukui , Akihiko Nishide , Makoto Gohno
发明人： Akira Hagiwara , Masatake Nukui , Akihiko Nishide , Makoto Gohno
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
CPC分类号： G01N23/046 , A61B6/032 , A61B6/488 , A61B6/5282 , G01N2223/419 , G01N2223/612
摘要： Embodiments of the present invention improve image quality by preventing artifacts from developing. From the projection data obtained by performing a scan for the imaging area of a subject, a tomographic image for a cross-sectional plane of the imaging area is reconstructed. Based on the tomographic image, the density distribution of the imaging area of the subject is then calculated. Thereafter, the scattered radiation beam data is calculated depending on the density distribution, and the projection data is corrected using the scattered radiation beam data. Finally the corrected image is reconstructed based on the corrected projection data.
摘要翻译：本发明的实施例通过防止伪影显影来提高图像质量。根据对被摄体的成像区域进行扫描获得的投影数据，重建摄像区域的截面的断层图像。基于断层图像，然后计算被检体的成像区域的密度分布。此后，根据密度分布计算散射辐射束数据，并且使用散射辐射束数据校正投影数据。最后，基于校正的投影数据重建校正图像。

5. 发明授权

US07639776B2 X-ray CT apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：US07639776B2
公开(公告)日：2009-12-29
申请号：US11757732
申请日：2007-06-04
申请人： Makoto Gohno , Tetsuya Horiuchi , Akihiko Nishide , Akira Hagiwara
发明人： Makoto Gohno , Tetsuya Horiuchi , Akihiko Nishide , Akira Hagiwara
IPC分类号： A61B6/00
CPC分类号： A61B6/032 , A61B6/027 , A61B6/488 , A61B6/542 , H05G1/30
摘要： The present invention aims to obtain a tomographic image similar in image quality to a tomographic image obtained by executing a scan at X-ray tube current value set by an X-ray automatic exposure function even when the X-ray tube current value set by the X-ray automatic exposure function are not within a standard range of the X-ray tube current values settable at the X-ray tube (21). X-ray tube current value supplied to the X-ray tube (21) are set by the X-ray automatic exposure function. Thereafter, when the X-ray tube current value set by the X-ray automatic exposure function is not within in the standard range of the X-ray tube current value settable at the X-ray tube, the X-ray tube current value at a portion not within the standard range are changed so as to be within the standard range, and the set value of helical pitch is changed so as to correspond to the ratio between the pre-changed x-ray tube current value and the post-changed X-ray tube current value.
摘要翻译：本发明的目的在于获得与通过由X射线自动曝光功能设定的X射线管电流值执行扫描而获得的断层图像相似的断层图像，即使当由X射线管电流值 X射线自动曝光功能不在X射线管（21）可设定的X射线管电流值的标准范围内。通过X射线自动曝光功能设定供给X射线管（21）的X射线管电流值。此后，当通过X射线自动曝光功能设定的X射线管电流值不在可设置在X射线管的X射线管电流值的标准范围内时，X射线管电流值在不在标准范围内的部分被改变为在标准范围内，并且改变螺距的设定值，以便对应于预先改变的X射线管电流值和后变化的X射线管电流值之间的比率 X射线管电流值。

6. 发明申请

US20080002806A1 X-RAY CT APPARATUS AND X-RAY CT IMAGING METHOD 审中-公开
标题翻译： X射线CT装置和X射线CT成像方法
公开(公告)号：US20080002806A1
公开(公告)日：2008-01-03
申请号：US11769424
申请日：2007-06-27
申请人： Akihiko Nishide , Makoto Gohno , Masatake Nukui , Akira Hagiwara , Kotoko Morikawa
发明人： Akihiko Nishide , Makoto Gohno , Masatake Nukui , Akira Hagiwara , Kotoko Morikawa
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
CPC分类号： A61B6/4035 , A61B6/027 , A61B6/032 , G01N23/046 , G01N2223/419 , G06T11/005
摘要： Improvement of the picture quality of tomograms in an X-ray CT apparatus using a multi-row x-ray detector is to be realized. When conventional scanning (axial scanning) or cine-scanning is to be performed in consecutive different scanning positions in the z-axis direction, the width of the X-ray beam at scanning positions at both ends is kept at exactly or approximately D/2 relative to the multi-row x-ray detector. Alternatively, the interval between one scanning position and another is kept at not more than D. Unevenness of picture quality dependent on positions on the z-axis on a reconstructed plane can be improved.
摘要翻译：要实现使用多行x射线检测器的X射线CT装置中的断层图像的图像质量的提高。当在z轴方向的连续不同扫描位置进行常规扫描（轴向扫描）或电影扫描时，两端扫描位置处的X射线束的宽度保持在精确或约为D / 2 相对于多行X射线检测器。或者，一个扫描位置与另一扫描位置之间的间隔保持在不大于D.可以提高依赖于重构平面上的z轴上的位置的图像质量的不均匀性。

7. 发明申请

US20080144764A1 X-RAY COMPUTED TOMOGRAPHY APPARATUS 有权
标题翻译： X射线计算机图像设备
公开(公告)号：US20080144764A1
公开(公告)日：2008-06-19
申请号：US11956813
申请日：2007-12-14
申请人： Akihiko Nishide , Makoto Gohno
发明人： Akihiko Nishide , Makoto Gohno
IPC分类号： A61B6/03
CPC分类号： A61B6/405 , A61B6/027 , A61B6/4035 , A61B6/542 , A61B6/583
摘要： The present invention provides an X-ray CT apparatus capable of improving image quality of a dual energy image. The X-ray CT apparatus comprises an X-ray tube for applying X rays having a first energy spectrum and X rays having a second energy spectrum different from the first energy spectrum to a subject, an X-ray data acquisition unit for acquiring X-ray projection data of the first energy spectrum projected onto the subject and X-ray projection data of the second energy spectrum projected thereonto, dual energy image reconstructing unit for image-reconstructing tomographic images indicative of X-ray tube voltage-dependent information at X-ray absorption coefficients related to a distribution of atoms, based on the X-ray projection data of the first energy spectrum and the X-ray projection data of the second energy spectrum, and adjusting unit for adjusting conditions for the image reconstruction in order to optimize the tomographic images indicative of the X-ray tube voltage-dependent information.
摘要翻译：本发明提供能够提高双能量图像的图像质量的X射线CT装置。 X射线CT装置包括：X射线管，用于将具有第一能谱的X射线和具有与第一能谱不同的第二能谱的X射线施加到被检体; X射线数据获取单元，投影到被摄体上的第一能量谱的射线投影数据和投射到其上的第二能量谱的X射线投影数据，双能量图像重建单元，用于将X射线管电压依赖信息的X射线管电压依赖性信息进行图像重建，基于第一能谱的X射线投影数据和第二能谱的X射线投影数据的与原子分布相关的射线吸收系数，以及用于调整图像重建的条件的调整单元，以优化所述断层图像指示所述X射线管电压依赖性信息。

8. 发明申请

US20070110210A1 X-RAY CT APPARATUS AND X-RAY CT FLUOROSCOPIC APPARATUS 审中-公开
标题翻译： X射线CT装置和X射线CT荧光装置
公开(公告)号：US20070110210A1
公开(公告)日：2007-05-17
申请号：US11559494
申请日：2006-11-14
申请人： Akihiko Nishide , Naoyuki Kawachi , Akira Izuhara , Makoto Gohno , Motoki Watanabe
发明人： Akihiko Nishide , Naoyuki Kawachi , Akira Izuhara , Makoto Gohno , Motoki Watanabe
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
CPC分类号： A61B6/032 , A61B6/027 , A61B6/4085
摘要： Tomography or X-ray CT fluoroscopy reduced in exposure to radiation in an X-ray CT apparatus or an X-ray CT fluoroscopic apparatus is to be substantialized. A channel-direction X-ray collimator or a beam forming X-ray filter is positionally controlled in the channel direction to carry out X-ray data acquisition while irradiation with X-rays limited to only the region of interest. Either the profile area of the whole subject is obtained or the profile area of the whole subject is predicted from views or scout images of irradiation of the whole subject out of X-ray projection data. Image reconstruction of views not irradiating the whole subject out of the collected X-ray projection data is carried out by predicting lacking parts from the profile area of the whole subject and making corrections accordingly. It is thereby made possible to irradiate only the region of interest with X-rays to reduce the exposure of the subject of tomography by the X-ray CT apparatus to X-rays or the exposure the subject to X-rays and the exposure of the operator's hands to radiation at the time of puncturing in X-ray CT fluoroscopy.
摘要翻译： X射线CT装置或X射线CT荧光检查装置中的放射线照射减少的层析成像术或X射线CT透视图被实质化。在通道方向上位置地控制通道方向X射线准直仪或束形成X射线滤波器，以在仅限于感兴趣区域的X射线的照射下进行X射线数据采集。获得整个被摄体的轮廓区域，或者通过X射线投影数据从整个被摄体的照射的视图或侦察图像中预测整个被摄体的轮廓区域。通过从整个被摄体的轮廓区域预测缺少的部分并进行相应的校正来进行从收集的X射线投影数据中不照射整个被摄体的视图的图像重建。由此，能够仅利用X射线照射感兴趣区域，以将X射线CT装置的X线摄影对象的X射线照射或X射线照射，手术时用X射线CT透视时穿刺手术。

9. 发明授权

US07756240B2 X-ray computed tomography apparatus 有权
标题翻译： X射线计算机断层摄影装置
公开(公告)号：US07756240B2
公开(公告)日：2010-07-13
申请号：US11956813
申请日：2007-12-14
申请人： Akihiko Nishide , Makoto Gohno
发明人： Akihiko Nishide , Makoto Gohno
IPC分类号： A61B6/00
CPC分类号： A61B6/405 , A61B6/027 , A61B6/4035 , A61B6/542 , A61B6/583
摘要： The present invention provides an X-ray CT apparatus capable of improving image quality of a dual energy image. The X-ray CT apparatus comprises an X-ray tube for applying X rays having a first energy spectrum and X rays having a second energy spectrum different from the first energy spectrum to a subject, an X-ray data acquisition unit for acquiring X-ray projection data of the first energy spectrum projected onto the subject and X-ray projection data of the second energy spectrum projected thereonto, dual energy image reconstructing unit for image-reconstructing tomographic images indicative of X-ray tube voltage-dependent information at X-ray absorption coefficients related to a distribution of atoms, based on the X-ray projection data of the first energy spectrum and the X-ray projection data of the second energy spectrum, and adjusting unit for adjusting conditions for the image reconstruction in order to optimize the tomographic images indicative of the X-ray tube voltage-dependent information.
摘要翻译：本发明提供能够提高双能量图像的图像质量的X射线CT装置。 X射线CT装置包括：X射线管，用于将具有第一能谱的X射线和具有与第一能谱不同的第二能谱的X射线施加到被检体; X射线数据获取单元，投影到被摄体上的第一能量谱的射线投影数据和投射到其上的第二能量谱的X射线投影数据，双能量图像重建单元，用于将X射线管电压依赖信息的X射线管电压依赖性信息进行图像重建，基于第一能谱的X射线投影数据和第二能谱的X射线投影数据的与原子分布相关的射线吸收系数，以及用于调整图像重建的条件的调整单元，以优化所述断层图像指示所述X射线管电压依赖性信息。

10. 发明申请

US20090097611A1 X-RAY CT APPARATUS AND METHOD FOR PROCESSING X-RAY PROJECTION DATA 有权
标题翻译： X射线CT设备和处理X射线投影数据的方法
公开(公告)号：US20090097611A1
公开(公告)日：2009-04-16
申请号：US12252095
申请日：2008-10-15
申请人： Akihiko Nishide , Makoto Gohno
发明人： Akihiko Nishide , Makoto Gohno
IPC分类号： A61B6/00
CPC分类号： A61B6/032 , A61B6/037 , A61B6/405 , A61B6/482 , A61B6/541 , G06T11/006 , G06T2211/408
摘要： An X-ray CT apparatus includes an X-ray irradiation unit for applying X-rays based on a first X-ray tube voltage and X-rays based on a second X-ray tube voltage to a subject by being switched every one view, a projection data acquisition unit for acquiring projection data by which X-ray tube voltage information about the applied X-rays are identified, and an image reconstruction unit for identifying first energy projection data based on the first X-ray tube voltage, second energy projection data based on the second X-ray tube voltage, and transient energy projection data acquired upon switching between the first and second X-ray tube voltages based on the X-ray tube voltage information, the image reconstruction unit including a conversion processor that converts the transient energy projection data to another data using the transient energy projection data and performs image reconstruction using the data subsequent to the conversion process.
摘要翻译： X射线CT装置包括：X射线照射单元，用于通过每一个视图切换，将X射线基于第一X射线管电压和基于第二X射线管电压的X射线施加到被摄体，投影数据获取单元，用于获取用于识别关于所施加的X射线的X射线管电压信息的投影数据;以及图像重建单元，用于基于第一X射线管电压来识别第一能量投影数据，第二能量投影基于第二X射线管电压的数据和基于X射线管电压信息在第一和第二X射线管电压之间切换时获取的瞬态能量投影数据，所述图像重建单元包括转换处理器，使用瞬态能量投影数据将瞬态能量投影数据转换为另一数据，并使用转换处理之后的数据进行图像重构。

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