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1. 发明专利

JP2011067554A X-ray ct apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：JP2011067554A
公开(公告)日：2011-04-07
申请号：JP2009223335
申请日：2009-09-28
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： SUZUKI ATSURO , WATANABE FUMITO , UEKI HIRONORI , KONNO YASUTAKA , KOJIMA SHINICHI , TSUBOTA YUJI
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/4021 , A61B6/4291 , A61B6/4411 , A61B6/585 , A61B6/587
摘要： PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus easily and accurately correcting a change in the incident X-ray dose caused by the movement of a focus. SOLUTION: A preprocessor 7 changes a focal position used as the position of an X-ray tube 2 in a condition without a subject 5 to acquire the X-ray incidence rate of each detection module in every focal position, approximates the X-ray incidence rate of each detection module with the X-ray incidence rate of the module with the presence of a reference detector obtained in the condition without the subject, and stores a coefficient of an approximate polynominal in a storage device 8. When imaging the subject 5, the X-ray incidence rate when imaging the subject of each detection module is computed using the X-ray incidence rate of the module with the presence of the reference detector, and the stored coefficient, and sensitivity correction data for every focal position is obtained using the computed X-ray incidence rate when imaging the subject. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：要解决的问题：提供X射线CT装置容易且准确地校正由焦点的移动引起的入射X射线剂量的变化。解决方案：预处理器7在没有被摄体5的状态下改变用作X射线管2的位置的焦点位置，以获取每个焦点位置处的每个检测模块的X射线入射率，近似X 在具有在没有受试者的条件下获得的参考检测器的情况下，具有模块的X射线发生率的每个检测模块的射线发生率，并将近似多项式的系数存储在存储装置8中。主体5，使用存在参考检测器的模块的X射线入射率，存储系数和每个焦点位置的灵敏度校正数据来计算对每个检测模块的被摄体成像时的X射线发生率使用计算的X射线发生率在成像对象时获得。版权所有（C）2011，JPO＆INPIT

2. 发明专利

JP2012034745A X-ray ct apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：JP2012034745A
公开(公告)日：2012-02-23
申请号：JP2010175541
申请日：2010-08-04
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： TSUBOTA YUJI , WATANABE FUMITO , UEKI HIRONORI , KONNO YASUTAKA , KOJIMA SHINICHI
IPC分类号： A61B6/03
摘要： PROBLEM TO BE SOLVED: To enhance detection efficiency of a detector by suppressing a sensitivity change of each detection element by heat transfer of an X-ray focus and crosstalk between the detection elements, in an X-ray CT apparatus and the X-ray detector disposed with a scattered radiation prevention grid.SOLUTION: The X-ray CT apparatus includes: an X-ray source generating X-rays from an X-ray focus position; an X-ray detection element array wherein the X-ray detection elements for detecting X-rays are two-dimensionally arranged in first and second directions with separators therebetween; the scattered radiation prevention grid, wherein X-ray transmission members and X-ray shielding members disposed between the X-ray detection element array and the X-ray focus are alternately arranged in the first and second directions, and wherein the X-ray shielding members each have a slant angle oriented to the X-ray focus; and at least one X-ray detector module with the X-ray detection element array as a unit. The separators are inclined against an X-ray focus direction within a range wherein the separators are stored in areas of the shadow of the X-rays generated by the X-ray shielding members of the scattered radiation prevention grid.
摘要翻译：要解决的问题：为了提高检测器的检测效率，通过在X射线CT装置和X射线CT装置中抑制X射线焦点的热传递和串扰的每个检测元件的灵敏度变化射线检测器设置有散射辐射防护网格。解决方案：X射线CT装置包括：X射线源，其从X射线焦点位置产生X射线; X射线检测元件阵列，其中用于检测X射线的X射线检测元件在第一和第二方向上二维布置，其间具有隔膜; 布置在X射线检测元件阵列和X射线焦点之间的X射线透射元件和X射线屏蔽元件沿第一和第二方向交替布置的散射辐射防护栅格，其中X射线屏蔽构件各自具有朝向X射线焦点的倾斜角度; 以及具有X射线检测元件阵列作为一个单元的至少一个X射线检测器模块。分离器在分散体存储在由散射辐射防护网格的X射线屏蔽构件产生的X射线的阴影的区域中的范围内，相对于X射线聚焦方向倾斜。版权所有（C）2012，JPO＆INPIT

3. 发明专利

JP2011251018A X-ray ct apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：JP2011251018A
公开(公告)日：2011-12-15
申请号：JP2010127401
申请日：2010-06-03
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： KOJIMA SHINICHI , WATANABE FUMITO , UEKI HIRONORI , KONNO YASUTAKA , TSUBOTA YUJI
IPC分类号： A61B6/03
CPC分类号： G01N23/046 , A61B6/032 , A61B6/5205 , A61B6/5258 , A61B6/5282 , A61B6/583 , A61B6/585
摘要： PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus in which an operation amount at the time of crosstalk correction is reduced and operation throughput is raised.SOLUTION: The X-ray CT apparatus includes: an X-rays generating part which generates X-rays; an X-ray detection section which has two or more X-ray detectors for detecting X-rays which has permeated a subject from the X-rays generating part; and an image generation section which rectifies a signal acquired in the X-ray detection section, and reconstructs an image, wherein when crosstalk correction in the two or more X-ray detectors is carried out in the image generation section, only correction of a component which decreases locally is carried out previously, and correction of the whole crosstalk component is carried out simultaneously with image reconstruction.
摘要翻译：解决的问题：提供一种其中减少串扰校正时的操作量并提高操作吞吐量的X射线CT装置。解决方案：X射线CT装置包括：产生X射线的X射线产生部; X射线检测部，其具有两个以上的X射线检测器，用于检测从X射线产生部渗透到被检体的X射线; 以及图像生成部，其对在X射线检测部中获取的信号进行整流，并重建图像，其中，如果在图像生成部中进行两个以上的X射线检测器的串扰校正，则仅修正成分这在本地进行减少，并且与图像重构同时执行整个串扰分量的校正。版权所有（C）2012，JPO＆INPIT

4. 发明专利

JP2011067555A X-ray ct apparatus 有权
标题翻译： X射线CT装置
公开(公告)号：JP2011067555A
公开(公告)日：2011-04-07
申请号：JP2009223336
申请日：2009-09-28
申请人： Hitachi Medical Corp , 株式会社日立メディコ
发明人： TSUBOTA YUJI , WATANABE FUMITO , UEKI HIRONORI , KONNO YASUTAKA , KOJIMA SHINICHI , SUZUKI ATSURO
IPC分类号： A61B6/03
CPC分类号： A61B6/032 , A61B6/06 , A61B6/4021 , A61B6/4208 , A61B6/58
摘要： PROBLEM TO BE SOLVED: To solve the problem that a scattered X-ray has to be corrected in order to highly accurately calculate an X-ray focal position deviation since the scattered X-ray scattered by a subject or a structural object is made incident to a detector (a shift detector) for detecting the X-ray focal position deviation and becomes a noise source, so as to reduce accuracy in detecting the position deviation, and, especially, the scattered X-ray caused by the subject allows a dose to be hardly estimated before measurement. SOLUTION: An X-ray CT apparatus includes: a scattered ray detector 6 for measuring the scattered dose to be made incident to the detector (the shift detector 5) for detecting the position deviation of an X-ray focal point 9; and a function of correcting the output of the shift detector 5 through the use of the scattered dose measured in the detector 6. COPYRIGHT: (C)2011,JPO&INPIT
摘要翻译：解决的问题为了解决为了高精度地计算X射线焦点位置偏差而必须校正散射X射线的问题，由于被检体或结构物体散射的散射X射线是入射到用于检测X射线焦点位置偏差的检测器（移位检测器），并成为噪声源，以降低检测位置偏差的精度，特别是由被检体引起的散射X射线允许在测量之前几乎不估计的剂量。解决方案：X射线CT装置包括：用于测量入射到检测器（移位检测器5）的散射剂量的散射射线检测器6，用于检测X射线焦点9的位置偏差; 以及通过使用在检测器6中测量的散射剂量来校正移位检测器5的输出的功能。版权所有（C）2011，JPO＆INPIT

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