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公开(公告)号：US4352020A
公开(公告)日：1982-09-28
申请号：US109088
申请日：1980-01-02
申请人： Isao Horiba , Shigenobu Yanaka , Yasuo Kuwabara , Kouichi Koike
发明人： Isao Horiba , Shigenobu Yanaka , Yasuo Kuwabara , Kouichi Koike
CPC分类号： A61B6/583 , G06T11/005 , Y10S378/901
摘要： In the X-ray CT system, the X-ray detectors vary in output characteristics such as linearity, directivity and radiation quality from one detector to another. To make compensations for such irregularities, a plurality of phantoms of different absorption is prepared in the CT system according to the present invention. Namely, this plurality of phantoms is set one by one in the measuring space in the same manner as in the examination of an examinee or subject to be examined; the coefficient of X-ray absorption is determined for each of these phantoms. Further, theoretical values of absorption for each phantom are compared to the actual absorption measurements on each phantom to provide an absorption error value for each detector at differing absorption levels. The actual subject absorption value for each detector is used to pick the two error values closest to the actual value. The two error values are interpolated or extrapolated to find an error value for correcting the actual absorption value. The above method steps are advantageously implemented by one or more digital computers. The corrected subject absorption values are provided to a conventional image reconstruction device to provide the desired X-ray video image.
摘要翻译： 在X射线CT系统中，X射线检测器的输出特性如线性度，方向性和辐射质量从一个检测器到另一个检测器的不同。 为了对这种不规则性进行补偿，在根据本发明的CT系统中制备了不同吸收的多个体模。 即，在测量空间中以与检查对象或被检查对象相同的方式一个接一个地设置多个幻影， 确定每个这些幻影的X射线吸收系数。 此外，将每个体模的吸收的理论值与每个体模上的实际吸收测量进行比较，以在不同吸收水平下为每个检测器提供吸收误差值。 每个检测器的实际物体吸收值用于选择最接近实际值的两个误差值。 两个误差值进行内插或外插，以找到用于校正实际吸收值的误差值。 上述方法步骤有利地由一个或多个数字计算机实现。 校正的被摄体吸收值被提供给常规图像重建装置以提供期望的X射线视频图像。
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公开(公告)号：US4942468A
公开(公告)日：1990-07-17
申请号：US343382
申请日：1989-04-26
CPC分类号： H04N3/155
摘要： In an image input device, in which an image is photographed by a television camera using a plurality of operational modes having numbers of scanning lines different from each other, a video signal thus obtained is subjected to an analogue to digital conversion and a digital image signal is stored, one of a plurality of sampling clocks obtained by dividing a main clock is selected; the analogue to digital conversion is effected by using the sampling clock thus selected; and at the same time synchronization signals of the horizontal and the vertical scannings of the television camera are formed by counting the selected sampling clock.
摘要翻译： 在图像输入装置中，通过电视摄像机使用具有彼此不同的扫描线数的多个操作模式来拍摄图像，由此获得的视频信号经受模数转换和数字图像信号 选择通过分割主时钟获得的多个采样时钟之一; 通过使用如此选择的采样时钟实现模数转换; 并且同时通过对所选择的采样时钟进行计数来形成电视摄像机的水平和垂直扫描的同步信号。
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3.发明授权System for computing correction factors for sensitivity differences in detector channels of an X-ray tomography apparatus 失效用于计算X射线断层摄影装置的检测器通道中灵敏度差异的校正因子的系统
公开(公告)号：US4654796A
公开(公告)日：1987-03-31
申请号：US644376
申请日：1984-08-27
申请人： Hiroshi Takagi , Kouichi Koike , Hiroyuki Takeuchi
发明人： Hiroshi Takagi , Kouichi Koike , Hiroyuki Takeuchi
CPC分类号： G06T11/005 , Y10S378/901
摘要： In an X-ray tomograph having an X-ray source and a multi-channel detector rotatable around a body under examination, circuitry for compensating for changes in the characteristics of the X-ray source or the channels of the detector by extracting from the X-ray transmission data at least one sensitivity correction component and using this component to correct the transmission data and thus effect the desired compensation.
摘要翻译： 在具有X射线源的X射线断层摄影机和可检测身体周围旋转的多通道检测器的X射线断层摄影机中，用于通过从X射线X提取X射线源或检测器的通道的特性的变化来补偿电路 - 传输数据至少一个灵敏度校正分量，并使用该分量校正传输数据，从而实现所需的补偿。
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公开(公告)号：US5023896A
公开(公告)日：1991-06-11
申请号：US356419
申请日：1989-05-25
申请人： Hisatake Yokouchi , Yukio Takasaki , Tadaaki Hirai , Kouichi Koike , Masayuki Tsuneoka , Yoichi Onodera , Takakazu Funo
发明人： Hisatake Yokouchi , Yukio Takasaki , Tadaaki Hirai , Kouichi Koike , Masayuki Tsuneoka , Yoichi Onodera , Takakazu Funo
摘要： An X-ray television apparatus applies an X-ray to an object to be inspected, converts the X-ray projection image of the object into an optical image by a fluorescent screen or an X-ray image intensifier, picks up the optical image by a TV camera, displays the video signal obtained by a TV monitor for fluoroscopic monitoring, and records radiograph of the object by using the video signal. Avalanche multiplication is caused on the photoconductive layer of the image pick-up tube of the TV camera so as to enable monitoring or imaging with high sensitivity at a low X-ray dose rate.
摘要翻译： X射线电视装置将X射线施加到被检查物体，通过荧光屏或X射线图像增强器将物体的X射线投影图像转换为光学图像，通过以下方式拾取光学图像： 电视摄像机显示由TV监视器获得的用于荧光透视监视的视频信号，并且通过使用视频信号记录对象的放射线照片。 在电视摄像机的摄像管的光电导层上引起雪崩乘法，以便以低X射线剂量率以高灵敏度进行监测或成像。
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公开(公告)号：US4598203A
公开(公告)日：1986-07-01
申请号：US663945
申请日：1984-10-23
申请人： Keiji Umetani , Atsushi Suzuki , Manabu Nakagawa , Minoru Yoshida , Fumio Kawaguchi , Hiromichi Yamada , Kouichi Koike
发明人： Keiji Umetani , Atsushi Suzuki , Manabu Nakagawa , Minoru Yoshida , Fumio Kawaguchi , Hiromichi Yamada , Kouichi Koike
CPC分类号： G01T1/2018 , G01T1/1644
摘要： A multielement radiation detector in which many elements are arranged in array. Each element includes a scintillator which is tilted with respect to the incident direction of radiant rays, and a silicon photodiode which is opposed to the plane of incidence of the scintillator. The light-receiving plane of the silicon photodiode is tilted to meet the inclination of the scintillator. Therefore, the gradient of detection sensitivity distribution is reduced in the thickness direction of the detectors.
摘要翻译： 多元素辐射检测器，其中许多元件排列成阵列。 每个元件包括相对于辐射线的入射方向倾斜的闪烁体和与闪烁体的入射平面相对的硅光电二极管。 硅光电二极管的光接收面倾斜以满足闪烁体的倾斜度。 因此，检测器的厚度方向的检测灵敏度分布的梯度减小。
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