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1. 发明公开

EP0450970A3 Automatic brightness compensation for x-ray imaging systems 失效
标题翻译： X射线成像系统的自动亮度补偿
公开(公告)号：EP0450970A3
公开(公告)日：1992-01-02
申请号：EP91303011.0
申请日：1991-04-05
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Belanger, Barry Fredric
IPC分类号： H05G1/36 , H05G1/60 , H04N5/321 , H05G1/46
CPC分类号： H05G1/46 , H05G1/36 , H05G1/60
摘要： The brightness of an X-ray video image during fluorography is maintained at a substantially constant level varying the X-ray dose in relation to changes in the average brightness of the X-ray image. As the X-ray system approaches the limits of its imaging capability, varying the X-ray dose alone may not yield the desired brightness level. At this point, the gain applied to the video signal is increased to improve the brightness. A linear brightness taper function is used such that, as the level of video gain required to maintain constant brightness increases, the actual video gain increases by a smaller proportional amount. This function results in the brightness of the video image decreasing somewhat as the video gain is required to provide a greater degree of brightness compensation. This reduction in brightness not only provides a visual indication to the image observer that the system is approaching the imaging limits, but also creates an illusion that noise artifacts in the image are not intensifying as the video gain increases.

2. 发明公开

EP0228648A3 Automatic X-ray image brightness controll 有权
标题翻译：自动X射线图像亮度控制
公开(公告)号：EP0228648A3
公开(公告)日：1990-01-03
申请号：EP86117536.2
申请日：1986-12-17
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Relihan, Gary Francis
IPC分类号： H05G1/36 , H05G1/46 , H04N5/32 , G01N23/04
CPC分类号： H05G1/36 , H04N5/32 , H05G1/46 , H05G1/60
摘要： A voltage signal proportional to the brightness of an x-ray image is derived. In a mA loop the ratio of a reference voltage to brightness is determined. If the brightness ratio does not equal 1 it causes the x-ray tube current controller to adjust current (mA) to eliminate the error. A command proportionate to the ratio is stored until the next image frame. In a kV loop a ratio of the last mA command and a set limit for mA is taken. This error ratio is multiplied by the brightness ratio to provide a kV control ratio indicative of how much of the brightness error the kV loop is obliged to correct. The kV control ratio is corrected for nonlinearity between kV change and brightness change and the resulting command is used to adjust the kV applied to the x-ray tube anode. In a video gain control loop a ratio is taken between the stored last brightness ratio or mA command and maximum mA command limit and the brightness change resulting from the last kV control command is ratioed to the maximum brightness factor limit. The result of multiplying the last two mentioned ratios and the brightness ratio is the new video gain (VG) control signal. The VG signal is used to adjust the f-stop of the video camera and the electronic gain to change brightness.

3. 发明公开

EP0450970A2 Automatic brightness compensation for x-ray imaging systems 失效
标题翻译： Automaticallyche HelligkeitskompensationfürbildgebendeRöntgenanlage。
公开(公告)号：EP0450970A2
公开(公告)日：1991-10-09
申请号：EP91303011.0
申请日：1991-04-05
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Belanger, Barry Fredric
IPC分类号： H05G1/36 , H05G1/60 , H04N5/321 , H05G1/46
CPC分类号： H05G1/46 , H05G1/36 , H05G1/60
摘要： The brightness of an X-ray video image during fluorography is maintained at a substantially constant level varying the X-ray dose in relation to changes in the average brightness of the X-ray image. As the X-ray system approaches the limits of its imaging capability, varying the X-ray dose alone may not yield the desired brightness level. At this point, the gain applied to the video signal is increased to improve the brightness. A linear brightness taper function is used such that, as the level of video gain required to maintain constant brightness increases, the actual video gain increases by a smaller proportional amount. This function results in the brightness of the video image decreasing somewhat as the video gain is required to provide a greater degree of brightness compensation. This reduction in brightness not only provides a visual indication to the image observer that the system is approaching the imaging limits, but also creates an illusion that noise artifacts in the image are not intensifying as the video gain increases.
摘要翻译：荧光成像期间的X射线视频图像的亮度维持在相对于X射线图像的平均亮度的变化改变X射线剂量的基本上恒定的水平。随着X射线系统接近其成像能力的极限，单独改变X射线剂量可能不会产生所需的亮度水平。此时，增加施加到视频信号的增益以提高亮度。使用线性亮度渐变功能，使得随着保持恒定亮度所需的视频增益的水平增加，实际的视频增益增加了较小的比例量。该功能导致视频图像的亮度随着视频增益需要提供更大程度的亮度补偿而稍微降低。亮度的这种降低不仅为图像观察者提供了系统正在接近成像限制的视觉指示，而且还产生了视频增益增加时图像中的噪声伪影不会增强的错觉。

4. 发明公开

EP0228648A2 Automatic X-ray image brightness controll 有权
标题翻译： Automaticallyche HelligkeitssteuerungfürRöntgenbilder。
公开(公告)号：EP0228648A2
公开(公告)日：1987-07-15
申请号：EP86117536.2
申请日：1986-12-17
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Relihan, Gary Francis
IPC分类号： H05G1/36 , H05G1/46 , H04N5/32 , G01N23/04
CPC分类号： H05G1/36 , H04N5/32 , H05G1/46 , H05G1/60
摘要： A voltage signal proportional to the brightness of an x-ray image is derived. In a mA loop the ratio of a reference voltage to brightness is determined. If the brightness ratio does not equal 1 it causes the x-ray tube current controller to adjust current (mA) to eliminate the error. A command proportionate to the ratio is stored until the next image frame. In a kV loop a ratio of the last mA command and a set limit for mA is taken. This error ratio is multiplied by the brightness ratio to provide a kV control ratio indicative of how much of the brightness error the kV loop is obliged to correct. The kV control ratio is corrected for nonlinearity between kV change and brightness change and the resulting command is used to adjust the kV applied to the x-ray tube anode. In a video gain control loop a ratio is taken between the stored last brightness ratio or mA command and maximum mA command limit and the brightness change resulting from the last kV control command is ratioed to the maximum brightness factor limit. The result of multiplying the last two mentioned ratios and the brightness ratio is the new video gain (VG) control signal. The VG signal is used to adjust the f-stop of the video camera and the electronic gain to change brightness.
摘要翻译：导出与X射线图像的亮度成比例的电压信号。在mA环路中，确定参考电压与亮度的比值。如果亮度比不等于1，则X射线管电流控制器调节电流（mA）以消除误差。与比例成比例的命令被存储直到下一个图像帧。在一个kV环路中，采用最后一个mA指令的比例和mA的设定极限。该误差比乘以亮度比，以提供kV控制比，其指示kV环路必须校正多少亮度误差。对kV变化和亮度变化之间的非线性校正了kV控制比，并且所得到的命令用于调整施加到x射线管阳极的kV。在视频增益控制环路中，存储的最后一个亮度比或mA指令与最大mA指令极限之间取一个比例，并且将最后一个kV控制命令产生的亮度变化与最大亮度因子限制进行比较。乘以最后两个比例和亮度比的结果是新的视频增益（VG）控制信号。 VG信号用于调整摄像机的f-stop和电子增益以改变亮度。

5. 发明授权

EP0450970B1 Automatic brightness compensation for x-ray imaging systems 失效
标题翻译：自动亮度补偿x射线成像系统。
公开(公告)号：EP0450970B1
公开(公告)日：1994-10-05
申请号：EP91303011.0
申请日：1991-04-05
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Belanger, Barry Fredric
IPC分类号： H05G1/36 , H05G1/60 , H04N5/321 , H05G1/46
CPC分类号： H05G1/46 , H05G1/36 , H05G1/60

6. 发明公开

EP0276170A3 Automatic X-ray image brightness control 失效
标题翻译：自动X射线图像亮度控制
公开(公告)号：EP0276170A3
公开(公告)日：1990-01-03
申请号：EP88300539.9
申请日：1988-01-22
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Relihan, Gary Francis , Kautzer, Jeffrey Alan
IPC分类号： H05G1/36 , H05G1/46 , H04N5/32
CPC分类号： H05G1/46 , H04N5/32 , H05G1/36 , H05G1/60
摘要： A voltage signal (29,42) proportional to the brightness of an x-ray image is derived. In a mA loop the ratio of a reference voltage to brightness is determined (in 70). If the brightness ratio does not equal 1 it causes the x-ray tube current controller (21,61) to adjust current (mA) to eliminate the error. A command proportionate to the ratio is stored (in 71) until the next image frame. In a kV loop a ratio of the last mA command and a set limit for mA is taken (in 80). This error ratio is multiplied (in 83) by the brightness ratio to provide a kV control ratio indicative to how much of the brightness error the kV loop is obliged to correct. The kV control ratio is corrected for nonlinearity between kV change and brightness change and the resulting command is used to adjust the kV applied to the x-ray tube anode. In a video gain control loop a ratio is taken (in 110) between the stored last brightness ratio of mA command and maximum mA command limit and the brightness change resulting from the last kV control command is ratioed (in 114) to the maximum brightness factor limit. The result of multiplying (in117) the last two mentioned ratios and the brightness ratio is the new video gain (VG) control signal. The VG signal is used to adjust the f-stop of the video camera and the electronic gain to change brightness.

7. 发明授权

EP0228648B1 Automatic X-ray image brightness controll 有权
标题翻译：对于X射线自动亮度控制
公开(公告)号：EP0228648B1
公开(公告)日：1998-04-15
申请号：EP86117536.2
申请日：1986-12-17
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Relihan, Gary Francis
IPC分类号： H05G1/36 , H05G1/46 , H04N5/32 , G01N23/04
CPC分类号： H05G1/36 , H04N5/32 , H05G1/46 , H05G1/60

8. 发明公开

EP0276170A2 Automatic X-ray image brightness control 失效
标题翻译： Automaticallyche HelligkeitssteuerungfürRöntgenbilder。
公开(公告)号：EP0276170A2
公开(公告)日：1988-07-27
申请号：EP88300539.9
申请日：1988-01-22
申请人： GENERAL ELECTRIC COMPANY
发明人： Meccariello, Thomas Vincent , Relihan, Gary Francis , Kautzer, Jeffrey Alan
IPC分类号： H05G1/36 , H05G1/46 , H04N5/32
CPC分类号： H05G1/46 , H04N5/32 , H05G1/36 , H05G1/60
摘要： A voltage signal (29,42) proportional to the brightness of an x-ray image is derived. In a mA loop the ratio of a reference voltage to brightness is determined (in 70). If the brightness ratio does not equal 1 it causes the x-ray tube current controller (21,61) to adjust current (mA) to eliminate the error. A command proportionate to the ratio is stored (in 71) until the next image frame. In a kV loop a ratio of the last mA command and a set limit for mA is taken (in 80). This error ratio is multiplied (in 83) by the brightness ratio to provide a kV control ratio indicative to how much of the brightness error the kV loop is obliged to correct. The kV control ratio is corrected for nonlinearity between kV change and brightness change and the resulting command is used to adjust the kV applied to the x-ray tube anode. In a video gain control loop a ratio is taken (in 110) between the stored last brightness ratio of mA command and maximum mA command limit and the brightness change resulting from the last kV control command is ratioed (in 114) to the maximum brightness factor limit. The result of multiplying (in117) the last two mentioned ratios and the brightness ratio is the new video gain (VG) control signal. The VG signal is used to adjust the f-stop of the video camera and the electronic gain to change brightness.
摘要翻译：导出与X射线图像的亮度成比例的电压信号（29,42）。在mA环路中，确定参考电压与亮度的比值（70）。如果亮度比不等于1，则X射线管电流控制器（21,61）调节电流（mA）以消除误差。与比例成比例的命令被存储（在71中）直到下一个图像帧。在一个kV环路中，采用最后的mA指令和mA的设定极限的比例（80）。该误差率乘以亮度比（83），以提供kV控制比，其指示kV环必须校正多少亮度误差。对kV变化和亮度变化之间的非线性校正了kV控制比，并且所得到的命令用于调整施加到x射线管阳极的kV。在视频增益控制环路中，mA存储的最后一个亮度比和最大mA指令限制之间的比例（以110为单位），并且由上一个kV控制命令引起的亮度变化与（114）中的最大亮度因子限制。最后两个比例和亮度比的乘积（in117）是新的视频增益（VG）控制信号。 VG信号用于调整摄像机的f-stop和电子增益以改变亮度。

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