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1.发明授权公开(公告)号：US07313218B2
公开(公告)日：2007-12-25
申请号：US10901212
申请日：2004-07-29
申请人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
发明人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
IPC分类号： G12K1/12
CPC分类号： G01T1/171 , A61B6/4233 , A61B6/4441 , A61B6/583 , A61B6/587 , Y10S378/901
摘要： A radiographic apparatus removes lag-behind parts from radiation detection signals taken from an FPD as X rays are emitted from an X-ray tube, on an assumption that the lag-behind part included in each X-ray detection signal is due to an impulse response formed of a plurality of exponential functions with different attenuation time constants. When a single attenuation time constant and intensity are provisionally set, checking is made whether an attenuation to a noise level of X-ray detection signals occurs in an X-ray non-emission state following an X-ray emission state. When the set attenuation time constant and intensity are found appropriate (OK), the impulse response having the single exponential function is determined valid. Corrected radiation detection signals are obtained by removing the lag-behind parts using the impulse response determined.
摘要翻译： 假设每个X射线检测信号中包含的滞后部分是由于脉冲而引起的，X射线从X射线管发射，从放射线检测信号中取出的放射线检测信号中的放射线照相设备 响应由具有不同衰减时间常数的多个指数函数形成。 当暂时设定单个衰减时间常数和强度时，检查在X射线发射状态之后的X射线非发射状态下是否产生对X射线检测信号的噪声水平的衰减。 当确定设定的衰减时间常数和强度是合适的（OK）时，具有单指数函数的脉冲响应被确定为有效。 使用确定的脉冲响应去除滞后部分来获得校正的放射线检测信号。
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2.发明授权公开(公告)号：US07203279B2
公开(公告)日：2007-04-10
申请号：US11087555
申请日：2005-03-24
申请人： Keiichi Fujii , Shoichi Okamura , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
发明人： Keiichi Fujii , Shoichi Okamura , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
IPC分类号： H05G1/58
CPC分类号： G01T1/2928 , A61B6/00 , A61B6/585 , H04N5/32 , H04N5/367
摘要： In the radiographic apparatus according to this invention, when a radiographic mode designator 16 designates a non-standard radiographic mode, a signal corrector 15 uses defect information stored in one of non-standard image defect information memories 18B–18E for correcting X-ray detection signals outputted from an FPD 2. Since the pixel defect information for non-standard X-ray images is acquired by a pixel defect information converter 19 through a conversion from defect information for standard X-ray images stored in a standard image defect information memory 18A, it is unnecessary to collect output signals for pixel defect information acquisition from the FPD 2 all over again. As a result, abnormal X-ray detection signals due to defects of radiation detecting elements may be corrected promptly, regardless of how the radiation detecting elements are assigned to the pixels in the X-ray images.
摘要翻译： 在根据本发明的射线照相设备中，当射线照相模式指示符16指定非标准射线照相模式时，信号校正器15使用存储在非标准图像缺陷信息存储器18B-18E之一中的缺陷信息来校正X- 从FPD2输出的射线检测信号。由于通过从存储在标准图像缺陷信息中的标准X射线图像的缺陷信息的转换，由像素缺陷信息转换器19获取非标准X射线图像的像素缺陷信息 存储器18A，不需要再次从FPD 2采集用于像素缺陷信息获取的输出信号。 结果，可以迅速地校正由于放射线检测元件的缺陷引起的异常X射线检测信号，而不管X射线图像中的像素如何分配辐射检测元件。
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3.发明申请公开(公告)号：US20050031070A1
公开(公告)日：2005-02-10
申请号：US10901212
申请日：2004-07-29
申请人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
发明人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
IPC分类号： G01N23/04 , A61B6/00 , G01T1/00 , G01T1/17 , G01T1/24 , G21K5/02 , G21K1/12 , G01N23/00 , H05G1/60
CPC分类号： G01T1/171 , A61B6/4233 , A61B6/4441 , A61B6/583 , A61B6/587 , Y10S378/901
摘要： A radiographic apparatus removes lag-behind parts from radiation detection signals taken from an FPD as X rays are emitted from an X-ray tube, on an assumption that the lag-behind part included in each X-ray detection signal is due to an impulse response formed of a plurality of exponential functions with different attenuation time constants. When a single attenuation time constant and intensity are provisionally set, checking is made whether an attenuation to a noise level of X-ray detection signals occurs in an X-ray non-emission state following an X-ray emission state. When the set attenuation time constant and intensity are found appropriate (OK), the impulse response having the single exponential function is determined valid. Corrected radiation detection signals are obtained by removing the lag-behind parts using the impulse response determined.
摘要翻译： 假设每个X射线检测信号中包含的滞后部分是由于脉冲而引起的，X射线从X射线管发射，从放射线检测信号中取出的放射线检测信号中的放射线照相设备 响应由具有不同衰减时间常数的多个指数函数形成。 当暂时设定单个衰减时间常数和强度时，检查在X射线发射状态之后的X射线非发射状态下是否产生对X射线检测信号的噪声水平的衰减。 当确定设定的衰减时间常数和强度是合适的（OK）时，具有单指数函数的脉冲响应被确定为有效。 使用确定的脉冲响应去除滞后部分来获得校正的放射线检测信号。
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4.发明申请公开(公告)号：US20050031088A1
公开(公告)日：2005-02-10
申请号：US10887920
申请日：2004-07-12
申请人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
发明人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
摘要： A subtraction image is obtained, by a subtraction process (DSA process), from a live image and a mask image. A lag-behind part included in each X-ray detection signal is considered due to an impulse response formed of exponential functions. The lag-behind part is removed from each X-ray detection signal by a recursive computation to obtain a corrected X-ray detection signal. The live image and mask image are obtained from such corrected detection signals.
摘要翻译： 通过减法处理（DSA处理）从实时图像和掩模图像获得减法图像。 由于由指数函数形成的脉冲响应，考虑了每个X射线检测信号中包含的滞后部分。 通过递归计算从每个X射线检测信号中去除滞后部分，以获得校正的X射线检测信号。 从这种校正的检测信号获得实时图像和掩模图像。
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5.发明申请公开(公告)号：US20050031079A1
公开(公告)日：2005-02-10
申请号：US10885634
申请日：2004-07-08
申请人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
发明人： Shoichi Okamura , Keiichi Fujii , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
IPC分类号： G01T1/00 , A61B6/00 , G01N23/00 , G01T1/17 , G03B42/02 , G06T1/00 , H04N5/225 , H04N5/325 , H05G1/08
CPC分类号： H04N5/325
摘要： A radiographic apparatus removes lag-behind parts from radiation detection signals taken from an FPD as X rays are emitted from an X-ray tube, on an assumption that the lag-behind part included in each X-ray detection signal is due to an impulse response formed of a plurality of exponential functions with different attenuation time constants. The lag-behind parts are removed by using impulse responses of the FPD corresponding, for example, to an X-ray dose used in a fluoroscopic image pickup and an X-ray dose used in a radiographic image pickup. X-ray images are created from corrected radiation detection signals with the lag-behind parts removed therefrom.
摘要翻译： 假设每个X射线检测信号中包含的滞后部分是由于脉冲而引起的，X射线从X射线管发射，从放射线检测信号中取出的放射线检测信号中的放射线照相设备 响应由具有不同衰减时间常数的多个指数函数形成。 通过使用FPD的脉冲响应来除去滞后部分，例如对应于例如在透视图像拾取中使用的X射线剂量和在放射线照相图像拾取中使用的X射线剂量。 从修正的放射线检测信号产生X射线图像，其中从其中移除滞后部分。
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6.发明申请公开(公告)号：US20050220268A1
公开(公告)日：2005-10-06
申请号：US11087555
申请日：2005-03-24
申请人： Keiichi Fujii , Shoichi Okamura , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
发明人： Keiichi Fujii , Shoichi Okamura , Susumu Adachi , Shinya Hirasawa , Toshinori Yoshimuta , Koichi Tanabe , Shigeya Asai , Akihiro Nishimura
CPC分类号： G01T1/2928 , A61B6/00 , A61B6/585 , H04N5/32 , H04N5/367
摘要： In the radiographic apparatus according to this invention, when a radiographic mode designator 16 designates a non-standard radiographic mode, a signal corrector 15 uses defect information stored in one of non-standard image defect information memories 18B-18E for correcting X-ray detection signals outputted from an FPD 2. Since the pixel defect information for non-standard X-ray images is acquired by a pixel defect information converter 19 through a conversion from defect information for standard X-ray images stored in a standard image defect information memory 18A, it is unnecessary to collect output signals for pixel defect information acquisition from the FPD 2 all over again. As a result, abnormal X-ray detection signals due to defects of radiation detecting elements may be corrected promptly, regardless of how the radiation detecting elements are assigned to the pixels in the X-ray images.
摘要翻译： 在根据本发明的射线照相设备中，当射线照相模式指示符16指定非标准射线照相模式时，信号校正器15使用存储在非标准图像缺陷信息存储器18B-18E之一中的缺陷信息来校正X- 从FPD2输出的射线检测信号。由于通过从存储在标准图像缺陷信息中的标准X射线图像的缺陷信息的转换，由像素缺陷信息转换器19获取非标准X射线图像的像素缺陷信息 存储器18A，不需要再次从FPD 2采集用于像素缺陷信息获取的输出信号。 结果，可以迅速地校正由于放射线检测元件的缺陷引起的异常X射线检测信号，而不管X射线图像中的像素如何分配辐射检测元件。
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