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1.发明公开
公开(公告)号：EP0518588A3
公开(公告)日：1993-07-21
申请号：EP92305223.7
申请日：1992-06-08
CPC分类号： G06T5/20 , G06T2207/10116 , G06T2207/30004 , H04N5/32 , H05G1/60
摘要： A medical imaging system includes a photodetector array which converts an X-ray image into a series of picture elements arranged in rows and columns of a two dimensional matrix. The picture elements are read from the array on a column by column basis. A spatial filter for the picture elements includes a first filter that applies one filter function to the pixels in each column of the image. The partially filtered pixels are stored in a first memory and then read therefrom row by row in a field interlaced order. The rows of picture elements are sent to a second filter that applies another filter function to each row. The fully filtered picture elements from the second filter either are stored or converted to a video signal for display.
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公开(公告)号：EP0365353A3
公开(公告)日：1990-08-16
申请号：EP89310841.5
申请日：1989-10-20
CPC分类号： A61B6/032 , A61B6/06 , A61B6/4035 , A61B6/4291 , G21K1/04 , H01J47/02
摘要： The system comprises an x-ray source (12), a collimator and attenuator (16) an equalization detector (30) and a control circuit (40) which controls the collimater (16) in dependence on the detector (30). The equalization detector (30) detects the intensity of x-rays received via a patient (24) in various zones in the detector (30) and controls the collimator (16) so as to compress the dynamic range of the received x-rays into a range compatible with an image detector (34) such as a photographic film.
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公开(公告)号：EP0365353B1
公开(公告)日：1994-05-04
申请号：EP89310841.5
申请日：1989-10-20
CPC分类号： A61B6/032 , A61B6/06 , A61B6/4035 , A61B6/4291 , G21K1/04 , H01J47/02
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公开(公告)号：EP0435528A3
公开(公告)日：1991-11-27
申请号：EP90313638.0
申请日：1990-12-14
CPC分类号： H05G1/36 , H04N5/2351 , H04N5/32 , H05G1/60
摘要： The brightness of an X-ray video image during fluorography is maintained at a substantially constant level by a control circuit which varies the X-ray dose in relation to changes in the average brightness of the X-ray image. Selected picture elements of the image which lie within a defined region in the image and which have a brightness above a given level are used to derive the average X-ray image brightness. The brightness of the selected picture elements are summed and the number of such picture elements counted. The summation of the brightness and the picture element count are both scaled by a factor of 2 n to reduce the size of the numbers and the complexity of the averaging circuitry. The scaled brightness summation is divided by the scaled picture element count and the result is stored as the average X-ray image brightness.
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5.发明公开Scanning radiographic system and equalization detector therefor 失效Raster-Röntgenbild-System unddafüranwendbarerGleichmässigkeits-Detektor。
公开(公告)号：EP0365353A2
公开(公告)日：1990-04-25
申请号：EP89310841.5
申请日：1989-10-20
CPC分类号： A61B6/032 , A61B6/06 , A61B6/4035 , A61B6/4291 , G21K1/04 , H01J47/02
摘要： The system comprises an x-ray source (12), a collimator and attenuator (16) an equalization detector (30) and a control circuit (40) which controls the collimater (16) in dependence on the detector (30). The equalization detector (30) detects the intensity of x-rays received via a patient (24) in various zones in the detector (30) and controls the collimator (16) so as to compress the dynamic range of the received x-rays into a range compatible with an image detector (34) such as a photographic film.
摘要翻译： 该系统包括根据检测器（30）控制准直器（16）的x射线源（12），准直器和衰减器（16）均衡检测器（30）和控制电路（40）。 均衡检测器（30）检测在检测器（30）中的各个区域中经由患者（24）接收的X射线的强度，并且控制准直器（16），以将接收到的x射线的动态范围压缩成 与诸如摄影胶片的图像检测器（34）兼容的范围。
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公开(公告)号：EP0444869B1
公开(公告)日：1995-07-05
申请号：EP91301526.9
申请日：1991-02-26
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公开(公告)号：EP0444869A3
公开(公告)日：1992-01-15
申请号：EP91301526.9
申请日：1991-02-26
摘要： An image detector (e.g. for X-ray images) includes an array of photodetectors (40,42,44) arranged in n rows and m columns with at least a portion of the photodetectors in each column being selectively connected to a common column output signal line (48⁻¹ - 48-m by a selector means. the image information is read out of the photodetectors by sequentially selecting groups of rows starting with a row near the middle of the array and then sequentially selecting other groups of rows on alternate sides of the array middle. As image data is read out of the photodetectors (40) in the selected row group, groups of column output lines (48) are coupled together to provide a combined output signal. This readout technique provides a reduction in the image data and reduces the likelihood of signal degradation for the central portion of the image.
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公开(公告)号：EP0435528A2
公开(公告)日：1991-07-03
申请号：EP90313638.0
申请日：1990-12-14
CPC分类号： H05G1/36 , H04N5/2351 , H04N5/32 , H05G1/60
摘要： The brightness of an X-ray video image during fluorography is maintained at a substantially constant level by a control circuit which varies the X-ray dose in relation to changes in the average brightness of the X-ray image. Selected picture elements of the image which lie within a defined region in the image and which have a brightness above a given level are used to derive the average X-ray image brightness. The brightness of the selected picture elements are summed and the number of such picture elements counted. The summation of the brightness and the picture element count are both scaled by a factor of 2 n to reduce the size of the numbers and the complexity of the averaging circuitry. The scaled brightness summation is divided by the scaled picture element count and the result is stored as the average X-ray image brightness.
摘要翻译： 通过控制电路将荧光成像期间的X射线视频图像的亮度维持在基本恒定的水平，该控制电路相对于X射线图像的平均亮度的变化改变X射线剂量。 使用位于图像中的限定区域内并且具有高于给定水平的亮度的图像的选定图像元素来导出平均X射线图像亮度。 将所选择的图像元素的亮度相加并计数这些图像元素的数量。 亮度和像素计数的总和都被缩放2倍的因子，以减小数字的大小和平均电路的复杂性。 缩放的亮度求和除以缩放的像素数，并将结果存储为平均X射线图像亮度。
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公开(公告)号：EP0426285A1
公开(公告)日：1991-05-08
申请号：EP90309702.0
申请日：1990-09-05
发明人： Schied, Carl Creglow , McFaul, James Augustine , McDaniel, David Leo , Barrett, David Miller , Pelc, Norbert Joseph
CPC分类号： A61B6/502 , A61B6/4291 , A61B6/4441 , A61B6/544 , A61B6/56 , G21K1/04
摘要： Method and apparatus for minimizing scatter in an X-ray imaging system of the type including a controllable source (50) of X-ray radiation and means for collimating the X-ray radiation into a fan-shaped beam and effecting scanning of the X-ray beam across a target area (60). The improved system includes a grid assembly (62) extending in a transverse direction across the target area and having a relatively narrow width in the beam scanning direction. A drive (74) is coupled to the grid removing the grid in synchronism with the X-ray beam and an X-ray impervious belt (110) is coupled to the grid and extends in a transverse direction across the target area and is movable with the grid for covering the target area outside the grid to prevent scatter radiation from impinging on X-ray film (64) located beneath the grid. In one form, the grid includes a plurality of air interspersed septa to allow reduced beam energy. In another form, the X-ray beam is collimated into a point source by the use of an X-ray impervious disk (132) positioned adjacent to and overlaying an X-ray window (136) in the X-ray source.
摘要翻译： 用于使包括X射线辐射的可控源（50）的类型的X射线成像系统中的散射最小化的方法和装置和用于将X射线辐射准直到扇形束中并实现X射线扫描的装置， 射线束穿过目标区域（60）。 改进的系统包括在横向上延伸穿过目标区域并且在波束扫描方向上具有相对窄的宽度的格栅组件（62）。 驱动器（74）联接到格栅，与X射线束同步地移除栅格，并且X射线不透过带（110）耦合到栅格并且横向延伸穿过目标区域并且可以随着 用于覆盖栅格外部的目标区域的栅格，以防止散射辐射撞击位于栅格下方的X射线胶片（64）上。 在一种形式中，网格包括多个空气散布的隔膜以允许减小的束能量。 在另一种形式中，通过使用与X射线源中的X射线窗口（136）相邻并且覆盖X射线窗口（136）的X射线不透光盘（132）将X射线束准直成点源。
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公开(公告)号：EP0244766A3
公开(公告)日：1989-04-12
申请号：EP87106291.5
申请日：1987-04-30
CPC分类号： A61B6/482 , A61B6/032 , A61B6/4035 , A61B6/405 , A61B6/4241 , G01T1/2935 , H01J47/02
摘要： A method and apparatus for providing dual energy radiation images of a patient in a kinestatic charge detection system utilizes first and second kinestatic charge detectors commonly connected to apparatus for rotating the detectors about a radiation source at a predetermined velocity. The detectors are adjusted such that ion drift velocity in each detector is equal in magnitude but opposite in direction to the velocity of rotation of the detectors. The radiation from the radiation source is modulated such that relatively low average energy radiation impinging on the patient is received by the first detector and relatively high average energy radiation impinging on the patient is received by the second detector. As the radiation is scanned across the patient and received by the detectors, output data from each detector provides information representative of the intensity of radiation received during the scan. The output data is then combined by a imaging system to form a difference image.
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