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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：US5022063A
公开(公告)日：1991-06-04
申请号：US468692
申请日：1990-01-23
摘要： In a real-time digital radiographic apparatus, an image is picked up by means of a TV camera. In a fluoroscopic monitoring mode, an output of the TV camera is displayed on a display in real time. In a radiographic imaging mode, the output of the TV camera is A/D converted, subjected to a necessary image processing and held as image data for diagnosis. In the fluoroscopic monitoring mode, a beam scanning for an image pickup tube corresponding to an NTSC system is performed whereas in the radiographic imaging mode a high-density and low-speed beam scanning can be selected in which the number of scanning lines is increased and the frame rate is lowered. In order to suppressing the lowering of the maximum signal current derivable from the image pickup tube which may occur in such a high-resolution scanning, a target voltage of the image pickup tube in a high-resolution mode is changed to a value higher than a standard value of the target voltage, thereby acquiring an image which has a wide dynamic range and a high S/N ratio.
摘要翻译： 在实时数字放射线照相设备中，通过电视摄像机拾取图像。 在透视监视模式中，电视摄像机的输出实时显示在显示器上。 在放射照相成像模式中，电视摄像机的输出被A / D转换，进行必要的图像处理，并作为用于诊断的图像数据保存。 在透视监视模式中，执行对应于NTSC系统的图像拾取管的光束扫描，而在放射照相成像模式中，可以选择扫描线数量增加的高密度和低速光束扫描， 帧速率降低。 为了抑制在这样的高分辨率扫描中可能发生的从图像拾取管导出的最大信号电流的降低，将高分辨率模式的图像拾取管的目标电压改变为高于 目标电压的标准值，从而获得具有宽动态范围和高S / N比的图像。
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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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公开(公告)号：US5485500A
公开(公告)日：1996-01-16
申请号：US186471
申请日：1994-01-26
申请人： Rika Baba , Ken Ueda , Hisatake Yokouchi , Yoichi Onodera , Keiji Umetani , Masayuki Tsuneoka
发明人： Rika Baba , Ken Ueda , Hisatake Yokouchi , Yoichi Onodera , Keiji Umetani , Masayuki Tsuneoka
摘要： A digital X-ray imaging system having an X-ray generator, an X-ray generator controller for controlling the X-ray generator, an X-ray detecting unit for detecting an X-ray transmitted through a subject, the X-ray detecting unit having an X-ray grid for shielding a scattered X-ray, a signal processor for acquiring a signal from the X-ray detecting unit and processing the signal to obtain a digital X-ray image of the subject, and a display device for displaying an image of the subject obtained by the signal processor. The system is provided with a position changing unit for changing a relative position between the X-ray detecting unit and the subject, a position change controller for controlling the position changing unit, and an imaging-sequence controller for controlling the position change controller and the X-ray generator controller. The imaging controller controls setting of each of a plurality of target imaging regions of the subject to generally a central area of an X-ray detecting plane of the X-ray detector, the X-ray detecting plane being an incident plane of the transmitted X-ray, and to set at least one imaging view field to contain an intermediate region between target imaging regions. The whole or part of a plurality of obtained digital X-ray images is used to join a single or a plurality of digital X-ray images for display.
摘要翻译： 一种具有X射线发生器，用于控制X射线发生器的X射线发生器控制器，用于检测通过被摄体透射的X射线的X射线检测单元的X射线成像系统，X射线检测 具有用于屏蔽散射X射线的X射线栅格的单元，用于从X射线检测单元获取信号并处理该信号以获得被摄体的数字X射线图像的信号处理器，以及用于 显示由信号处理器获得的被摄体的图像。 该系统设置有用于改变X射线检测单元和被摄体之间的相对位置的位置改变单元，用于控制位置改变单元的位置改变控制器，以及用于控制位置变化控制器和 X射线发生器控制器。 成像控制器将被摄体的多个目标摄像区域中的每一个的设置控制为X射线检测器的X射线检测平面的大致中心区域，X射线检测面是透射X的入射面 并且设置至少一个成像视野以包含目标成像区域之间的中间区域。 多个获得的数字X射线图像的全部或一部分用于连接单个或多个数字X射线图像以进行显示。
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公开(公告)号：US4881124A
公开(公告)日：1989-11-14
申请号：US220978
申请日：1988-07-18
CPC分类号： H04N5/3205 , H05G1/60
摘要： An X-ray television apparatus in which an X-ray image which is obtained by an X-ray image intensifier is converted to an electrical signal by a television camera. This electrical signal is converted to a digital signal and stored into an image memory, and the angiographic imaging can be performed due to a differential process of data between two X-ray images. Either one of first, second, and third operating modes in which the scanning periods and the numbers of scanning lines of the television camera differ and a fourth operating mode to obtain the X-ray images by a further low X-ray dose and to simultaneously monitor the X-ray images can be selected. Thus, proper time resolution and spatial resolution according to a desired purpose can be obtained and the beam current of the image pickup tube of the television camera which is optimum in each operating mode is set.
摘要翻译： 一种X射线电视设备，其中由X射线图像增强器获得的X射线图像由电视摄像机转换成电信号。 该电信号被转换为数字信号并存储到图像存储器中，并且由于两个X射线图像之间的数据的差分处理，可以执行血管造影成像。 第一，第二和第三操作模式中的任何一个，其中电视摄像机的扫描周期和扫描线的数量不同，以及通过进一步的低X射线剂量获得X射线图像的第四操作模式，并且同时 可以选择监视X射线图像。 因此，可以获得根据期望目的的适当的时间分辨率和空间分辨率，并且设置在每个操作模式中最佳的电视摄像机的图像拾取管的束电流。
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6.发明授权
公开(公告)号：US4809071A
公开(公告)日：1989-02-28
申请号：US941641
申请日：1986-12-15
摘要： A television camera device for obtaining an image of high resolution by making the number of scanning lines on the target plate of an image pickup tube about twice larger than that in the television standard system and making the scanning speed of electron beam at the surface of the target plate smaller than that in the television standard system, is disclosed in which an electric field intensity in a region between the target plate and a mesh electrode (namely, the fourth grid electrode) is made greater than or equal to 5.3 KV/cm, to improve the landing characteristics of scanning electron beam, thereby preventing the occurrence of the water fall phenomenon peculiar to a slow scanning operation.
摘要翻译： 一种电视照相机装置，用于通过使图像拾取管的目标板上的扫描线数量大于电视标准系统中的扫描线数量的两倍而获得高分辨率的图像，并使电子束的扫描速度在 目标板比电视标准系统小的目标板，其中目标板和网格电极（即第四栅极）之间的区域中的电场强度大于或等于5.3KV / cm， 以改善扫描电子束的着陆特性，从而防止慢扫描操作特有的水落下现象的发生。
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