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

IPC分类号： H05G1/64 ,  H01J29/45 ,  H01J31/38 ,  H04N5/32 ,  H05G1/60

CPC分类号： H05G1/60 ,  H01J29/45 ,  H01J31/38 ,  H04N5/32

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。

公开(公告)号：US5022063A

公开(公告)日：1991-06-04

申请号：US468692

申请日：1990-01-23

申请人： Hisatake Yokouchi ,  Yoichi Onodera ,  Takakazu Funo ,  Masayuki Tsuneoka

发明人： Hisatake Yokouchi ,  Yoichi Onodera ,  Takakazu Funo ,  Masayuki Tsuneoka

IPC分类号： A61B6/00 ,  H04N5/228 ,  H04N5/32 ,  H05G1/60

CPC分类号： H05G1/60 ,  H04N5/32

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。