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1. 发明授权

US07149277B2 Correction coefficient calculating method for X-ray CT systems, beam hardening post-processing method therefor, and X-ray CT system 有权
标题翻译： X射线CT系统的校正系数计算方法，射束硬化后处理方法和X射线CT系统
公开(公告)号：US07149277B2
公开(公告)日：2006-12-12
申请号：US10816626
申请日：2004-04-02
申请人： Shunichiro Tanigawa , Masatake Nukui
发明人： Shunichiro Tanigawa , Masatake Nukui
IPC分类号： A61B6/03
CPC分类号： A61B6/583 , A61B6/032 , A61B6/06 , A61B6/5258
摘要： An object of the present invention is to calculate a more accurate beam-hardening correction coefficient. A phantom having an oblong section or a phantom having an annular (sector) section and a uniform thickness is positioned in an X-ray CT system, and scanned from plural directions in order to acquire a plurality of views. The results of the scan are used to calculate a correction coefficient that is used to correct projection information to be acquired from a subject.
摘要翻译：本发明的一个目的是计算更准确的光束硬化校正系数。具有椭圆形截面或具有环形（扇形）部分和均匀厚度的体模的体模被定位在X射线CT系统中，并且从多个方向扫描以获得多个视图。扫描的结果用于计算用于校正要从对象获取的投影信息的校正系数。

2. 发明授权

US07088800B2 X-ray CT system and beam-hardening post-processing method 失效
标题翻译： X射线CT系统和射束硬化后处理方法
公开(公告)号：US07088800B2
公开(公告)日：2006-08-08
申请号：US10825526
申请日：2004-04-15
申请人： Masatake Nukui , Shunichiro Tanigawa
发明人： Masatake Nukui , Shunichiro Tanigawa
IPC分类号： A61B6/03
CPC分类号： A61B6/583 , A61B6/032 , A61B6/488 , A61B6/542 , G01N23/046 , G01N2223/419
摘要： An X-ray computed tomographic (CT) system includes: a beam-hardening correction block that corrects first projection information in terms of the beam-hardening effect so as to produce second projection information; a first fitting block that fits a first function to the second projection information so as to produce third projection information; a second fitting block that fits a second function to the third projection information values that are provided as functions having as independent variables the second projection information values sampled in relation to all the views and each of the channels of an X-ray detector; and a correction coefficient modification block that modifies a second correction coefficient, which is calculated using a second phantom larger in dimensions than a first phantom, using a first correction coefficient calculated using the first phantom.
摘要翻译： X射线计算机断层摄影（CT）系统包括：光束硬化校正块，其根据光束硬化效应校正第一投影信息，以产生第二投影信息; 第一装配块，其将第一功能适配到所述第二投影信息，以便产生第三投影信息; 第二装配块，其将第二功能拟合到作为具有作为独立变量的函数提供的第三投影信息值，所述第二投影信息值相对于X射线检测器的所有视图和每个通道进行采样的第二投影信息值; 以及校正系数修改块，其使用使用第一体模计算的第一校正系数来修改使用尺寸大于第一体模的第二体模计算的第二校正系数。

3. 发明授权

US06944258B2 Beam hardening post-processing method and X-ray CT apparatus 失效
标题翻译：光束硬化后处理方法和X射线CT装置
公开(公告)号：US06944258B2
公开(公告)日：2005-09-13
申请号：US10717382
申请日：2003-11-19
申请人： Masatake Nukui , Shunichiro Tanigawa
发明人： Masatake Nukui , Shunichiro Tanigawa
IPC分类号： A61B6/00 , A61B6/03 , G01N23/04
CPC分类号： A61B6/583 , A61B6/032 , A61B6/585 , G01N23/04 , Y10S378/901
摘要： A beam hardening post-processing method that can improve the accuracy of channel-by-channel correction on a BH effect easily and yet taking a non-linear effect into account, phantoms of different diameters are disposed at a position offset from an imaging center to acquire projection information having a transmission length of an X-ray beam varying from view to view, hence, acquire projection information having a projection information value varying from view to view, for each channel, correction factors are determined, and a corrective function containing even a non-linear effect is determined by higher-order function fitting from the correction factors; and therefore, correction with high accuracy can be achieved in the channel-by-channel correction on the projection information values conducted after BH correction, and moreover, correction with high accuracy can be achieved using a smaller amount of phantom projection information, thus reducing the time for calibration work.
摘要翻译：能够容易地提高BH效应的逐通道校正精度并且考虑非线性效应的光束硬化后处理方法，将不同直径的幻影设置在偏离成像中心的位置处获取具有从视图变化的X射线束的透射长度的投影信息，因此，对于每个通道，获取具有从视野变化的投影信息值的投影信息，确定校正因子，以及包含均匀的校正因子通过校正因子拟合的高阶函数来确定非线性效应; 因此，可以在通过BH校正后进行的投影信息值的逐通道校正中实现高精度的校正，此外，可以使用较少量的幻影投影信息来实现高精度的校正，从而减少校准工作时间。

4. 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。

5. 发明申请

US20070165772A1 Methods and apparatus for scatter correction 有权
公开(公告)号：US20070165772A1
公开(公告)日：2007-07-19
申请号：US11331727
申请日：2006-01-14
申请人： Paavana Sainath , Xiaoye Wu , Masatake Nukui , Ronald Lundgren , Thomas Myers
发明人： Paavana Sainath , Xiaoye Wu , Masatake Nukui , Ronald Lundgren , Thomas Myers
IPC分类号： H05G1/60 , A61B6/00 , G01N23/00 , G21K1/12
CPC分类号： G06T11/005 , A61B6/027 , Y10S378/901
摘要： A method for reconstructing an image of an object includes scanning the object with a computed tomography (CT) system to obtain data, estimating a size of the object using the obtained data, using the estimated size of the object to perform scatter correction on the obtained data, and reconstructing an image using the scatter corrected data.

6. 发明授权

US06466639B2 X-ray CT imaging method, subject center position detection method, and X-ray CT apparatus 失效
标题翻译： X射线CT成像方法，对象中心位置检测方法，X射线CT装置等
公开(公告)号：US06466639B2
公开(公告)日：2002-10-15
申请号：US09751953
申请日：2000-12-29
申请人： Masatake Nukui , Akihiko Nishide
发明人： Masatake Nukui , Akihiko Nishide
IPC分类号： A61B603
CPC分类号： A61B6/032 , A61B6/04 , A61B6/488
摘要： In order to detect whether the center position of a subject is offset from a scan center and notify a human operator of the result of the detection, the subject center position is detected based on a projection profile of a parallel view at a view angle of 90° (S5). If the distance between the subject center position and the scan center exceeds a predefined range (e.g., 50 cm) (S6), a warning is displayed on a CRT to prompt the operator to adjust the position of the subject and repeat imaging (S7).
摘要翻译：为了检测被摄体的中心位置是否偏离扫描中心，并向人类操作者通知检测结果，基于视角为90°的平行视图的投影轮廓来检测被摄体中心位置 °（S5）。如果主体中心位置和扫描中心之间的距离超过预定范围（例如50厘米）（S6），则在CRT上显示警告以提示操作者调整被摄体的位置并重复成像（S7）。

7. 发明授权

US07508903B2 Collimator control method and X-ray CT apparatus 失效
标题翻译：准直仪控制方法和X射线CT装置
公开(公告)号：US07508903B2
公开(公告)日：2009-03-24
申请号：US11199429
申请日：2005-08-08
申请人： Akihiko Nishide , Masatake Nukui , Katsumi Azu
发明人： Akihiko Nishide , Masatake Nukui , Katsumi Azu
IPC分类号： G01N23/083 , G21K1/04
CPC分类号： A61B6/06 , A61B6/027 , A61B6/4085 , A61B6/542
摘要： A collimator control method for an X-ray CT apparatus includes changing an aperture of the collimator according to a position of a helical scan on the body axis of the subject in the progress of the helical scan.
摘要翻译：用于X射线CT装置的准直器控制方法包括在螺旋扫描的进行中根据螺旋扫描在被检体的体轴上的位置来改变准直器的孔径。

8. 发明授权

US07336759B2 Scattering compensating method and scattering measuring method 有权
标题翻译：散射补偿方法和散射测量方法
公开(公告)号：US07336759B2
公开(公告)日：2008-02-26
申请号：US11365249
申请日：2006-03-01
申请人： Masatake Nukui
发明人： Masatake Nukui
IPC分类号： H05G1/60
CPC分类号： G01N23/046 , A61B6/5282 , A61B6/583 , G01N2223/419 , G01N2223/612 , Y10S378/901
摘要： A method for compensating scattering includes acquiring the projective length of non-subject entities and acquiring the projective length of an object of radiography wherein the object of radiography is radiographed with a beam thickness set to the same value as a detector thickness and the object of radiography is radiographed with the beam thickness set to a value larger than the detector thickness. An amount of scattering is calculated based on the difference between the object data from the first scan and the object data from the second scan and stored in association with the sum of projective lengths. A subject is radiographed to produce data and the projective length of the subject is calculated along with the projective length of the non-subject entities having affected the data. The amount of scattering associated with the sum of the projective length and the projective length is then determined.
摘要翻译：用于补偿散射的方法包括获取非对象实体的投影长度并获取放射线照相目标的投影长度，其中放射线照相的对象被放射照相，其中光束厚度被设置为与检测器厚度相同的值，并且射线成像对象被放射照相，其光束厚度设定为大于检测器厚度的值。基于来自第一扫描的对象数据与来自第二扫描的对象数据之间的差异计算散射量，并且与投影长度之和相关联地存储。拍摄主题以产生数据，并计算受试者的投影长度以及受影响数据的非主体实体的投影长度。然后确定与投影长度和投影长度之和相关联的散射量。

9. 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。

10. 发明授权

US07164746B2 X-ray CT apparatus and imaging method 有权
标题翻译： X射线CT装置及成像方法
公开(公告)号：US07164746B2
公开(公告)日：2007-01-16
申请号：US11032559
申请日：2005-01-10
申请人： Makoto Gohno , Masatake Nukui
发明人： Makoto Gohno , Masatake Nukui
IPC分类号： A61B6/03
CPC分类号： A61B6/488 , A61B6/027 , A61B6/032 , A61B6/469 , A61B6/5223 , G01N23/04 , Y10S378/901
摘要： An imaging method for an X-ray CT apparatus having an X-ray source and an X-ray detector disposed to face the X-ray source with a subject placed therebetween, for rotating at least one of the X-ray source and X-ray detector around the subject and detecting X-rays emitted from the X-ray source toward the subject by the X-ray detector, comprises the steps of: defining a reconstruction plane for the subject in a plane non-parallel to a plane formed by rotation of at least one of the X-ray source and X-ray detector around the subject; scanning the subject by emitting cone-shaped X-rays from the X-ray source; and reconstructing a tomographic image of the subject based on the defined reconstruction plane.
摘要翻译：一种具有X射线源和X射线检测器的X射线CT装置的成像方法，该X射线源和X射线检测器被设置为面对X射线源，被摄体位于其间，用于旋转X射线源和X射线源中的至少一个，并且通过X射线检测器检测从X射线源朝向被检体发射的X射线，包括以下步骤：在与平面不平行的平面中定义被摄体的重建平面，所述平面不平行于由 X射线源和X射线检测器中的至少一个围绕被检体旋转; 通过从X射线源发射锥形X射线来扫描受试者; 以及基于所述确定的重建平面重建所述对象的断层图像。

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