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1. 发明申请

WO1992000567A1 COMPUTED TOMOGRAPHY APPARATUS USING IMAGE INTENSIFIER DETECTOR 审中-公开
标题翻译：使用图像增强器检测器的计算机图像设备
公开(公告)号：WO1992000567A1
公开(公告)日：1992-01-09
申请号：PCT/US1991004778
申请日：1991-07-02
申请人： VARIAN ASSOCIATES, INC.
发明人： VARIAN ASSOCIATES, INC. , SEPPI, Edward, J. , SHAPIRO, Edward, G. , ANDERSON, Robert, L.
IPC分类号： G06F15/42
CPC分类号： H05G1/64 , A61B6/032 , A61B6/548 , A61B6/583 , H04N5/32 , Y10S128/92
摘要： Disclosed is a low cost computer tomographic (CT) scanner system specifically designed for radiation therapy treatment planning. A 512-channel photo-diode array (44) with digitizing electronics converts image intensifier (40) optical projection data directly into digital signals and has a dynamic range on the order of 1000,000:1. The new simulator includes a rotating gantry, an X-ray generator (30) with radiographic and fluoroscopic modes and a therapy style patient support assembly. Results on head and body size phantoms indicate that the simulator X-ray generator and image intensifier tube (IIT) (40) with multi-channel photo-detector (44) can produce photon statistic limited CT images. Software and hardware compensation methods are described which minimize geometrical distortions. Low noise, high input impedance electronics are employed which are phase locked to the line frequency. A dual sample interval method is employed which effectively increases the range of the digital signal produced by the front-end electronics by three additional bits.
摘要翻译：公开了专门用于放射治疗治疗计划的低成本计算机断层摄影（CT）扫描仪系统。具有数字化电子设备的512通道光电二极管阵列（44）将图像增强器（40）的光学投影数据直接转换为数字信号，并具有大约1000,000:1的动态范围。新的模拟器包括旋转机架，具有射线照相和透视模式的X射线发生器（30）和治疗方式的患者支架组件。头部和体型模型的结果表明，具有多通道光电探测器（44）的模拟器X射线发生器和图像增强管（II）（40）可以产生光子统计有限的CT图像。描述了最小化几何失真的软件和硬件补偿方法。使用低噪声，高输入阻抗电子器件，其被锁相到线路频率。采用双采样间隔方法，其通过三个附加位有效地增加由前端电子器件产生的数字信号的范围。

2. 发明申请

WO1992000657A1 METHOD FOR INCREASING THE ACCURACY OF A RADIATION THERAPY APPARATUS 审中-公开
标题翻译：增加辐射治疗装置精度的方法
公开(公告)号：WO1992000657A1
公开(公告)日：1992-01-09
申请号：PCT/US1991004768
申请日：1991-07-02
申请人： VARIAN ASSOCIATES, INC.
发明人： VARIAN ASSOCIATES, INC. , SEPPI, Edward, J. , SHAPIRO, Edward, G. , PAVKOVICH, John, M.
IPC分类号： H05G01/64
CPC分类号： H05G1/64 , A61B6/032 , A61B6/548 , A61B6/583 , A61N5/1048 , G01T1/1645
摘要： Disclosed is a method for increasing the accuracy of images obtained in radiation therapy apparatus, such as computer tomography simulator which employs an image intensifier (40) and a photodiode detector (44) for converting light from the image intensifier to electrical signals for further processing. The method recognizes that a significant amount of crosstalk can exist in the image intensifier and photodiode detector chain and provides a series of steps for adjusting the electrical signals obtained from the photodiode detector to compensate for the crosstalk.

3. 发明申请

WO1993018822A1 IMPROVED X-RAY VOLUMETRIC CT SCANNER 审中-公开
标题翻译：改进的X射线体积CT扫描仪
公开(公告)号：WO1993018822A1
公开(公告)日：1993-09-30
申请号：PCT/US1993002762
申请日：1993-03-24
申请人： VARIAN ASSOCIATES, INC.
发明人： VARIAN ASSOCIATES, INC. , SEPPI, Edward, J. , PAVKOVICH, John, M. , SHAPIRO, Edward, G.
IPC分类号： A61N05/10
CPC分类号： A61B6/032 , A61B6/4021 , A61B6/4085 , A61B6/4291 , A61N5/1048
摘要： A slow scanning CT Scanner providing slice data simultaneously for a plurality of slices so as to avoid blurring between adjacent slices due to patient movement.
摘要翻译：慢扫描CT扫描器同时提供多个切片的切片数据，以避免由于患者移动而导致相邻切片之间的模糊。

4. 发明申请

WO1992000574A1 METHOD FOR IMPROVING THE DYNAMIC RANGE OF AN IMAGING SYSTEM 审中-公开
标题翻译：改进成像系统动态范围的方法
公开(公告)号：WO1992000574A1
公开(公告)日：1992-01-09
申请号：PCT/US1991004777
申请日：1991-07-02
申请人： VARIAN ASSOCIATES, INC.
发明人： VARIAN ASSOCIATES, INC. , SEPPI, Edward, J. , SHAPIRO, Edward, G. , PAVKOVICH, John, M.
IPC分类号： G06K09/60
CPC分类号： H05G1/60 , A61B6/548 , A61B6/583 , H04N5/32
摘要： Disclosed is a method for improving the dynamic resolution of an imaging system. The method employs a dual sampling or exposure technique which samples light from an image intensifier (40) over a long and a short sample interval. When the resulting measurement for the long sample interval exceeds a threshold level, the short sample interval measurement is used, multiplied by a scaling factor (50). Below the treshold the long sample interval is used.

5. 发明申请

WO1998024059A1 MULTIPLE MODE DIGITAL X-RAY IMAGING SYSTEM 审中-公开
标题翻译：多模式数字X射线成像系统
公开(公告)号：WO1998024059A1
公开(公告)日：1998-06-04
申请号：PCT/US1997021685
申请日：1997-11-26
申请人： VARIAN ASSOCIATES, INC.
发明人： VARIAN ASSOCIATES, INC. , COLBETH, Richard, E. , PAVOKOVICH, John, M. , SEPPI, Edward, J. , SHAPIRO, Edward, G.
IPC分类号： G06T05/20
CPC分类号： A61B6/00 , A61B6/5235 , H04N5/217 , H04N5/32 , H04N5/347 , H04N5/367
摘要： A multiple mode digital X-ray imaging system providing for preprocessing "binning" of analog pixel signals from a detector array by selectively summing, within the detector array, adjacent pixel charges on a row-by-row basis and selectively summing, within detector array readout circuits, the previously summed pixel charges (by rows) on a column-by-column basis. An array, or mapping, of "defective pixel" flags is used to identify defective pixels within the detector array, with such flags being added to, or inserted into, the incoming data stream for dynamic processing along with the incoming pixel data. A buffer and filter is used to perform still image capture during the radiographic mode of operation and to recursively filter incoming data frames during the fluoroscopic mode of operation by summing a scaled amount of pixel data from prior data frames with a scaled amount of incoming pixel data from the present data frame.
摘要翻译：一种多模式数字X射线成像系统，其通过在检测器阵列内通过在检测器阵列内逐行求和相邻像素电荷并在检测器阵列内进行选择性求和来预处理来自检测器阵列的模拟像素信号“ 读出电路，先前相加的像素电荷（按行）逐列。使用“缺陷像素”标志的阵列或映射来识别检测器阵列内的有缺陷的像素，其中这些标记被附加到输入数据流中或插入到输入数据流中，以便与输入像素数据一起进行动态处理。使用缓冲器和滤波器在放射线照相操作模式下执行静态图像捕获，并且在荧光镜操作模式期间递归滤波输入数据帧，通过将来自先前数据帧的像素数据的缩放量与输入像素数据的标度量相加从当前的数据帧。

6. 发明申请

WO1992000656A1 ELECTRONICALLY ENHANCED X-RAY DETECTOR APPARATUS 审中-公开
标题翻译：电子增强X射线探测器设备
公开(公告)号：WO1992000656A1
公开(公告)日：1992-01-09
申请号：PCT/US1991004767
申请日：1991-07-02
申请人： VARIAN ASSOCIATES, INC.
发明人： VARIAN ASSOCIATES, INC. , SEPPI, Edward, J. , SHAPIRO, Edward, G. , PAVKOVICH, John, M.
IPC分类号： H05G01/64
CPC分类号： H05G1/64 , A61B6/032 , A61B6/548 , A61B6/583 , A61N5/1048
摘要： The detector of the present invention is suitable for use in a radiation therapy simulator machine. The detector comprises an x-ray image intensifier tube (40) to convert x-rays into photons, a linear array of photodiodes (44) to convert the photons to electrical signals, optical means (52, 54) for coupling the photons to the linear array of photodiodes, and electronic signal processing means (46) for conditioning the signals from the photodiodes. The conditioning includes the use of low noise, phaselocked sampling electronics, implementation of a dual sampling technique for increasing dynamic range, implementation of linearizing technique for increasing the accuracy of the measurements, and implementation of techniques for adjusting the measurements for point spread and background noise effects.

7. 发明申请

WO1992000566A1 PARTIAL FAN BEAM TOMOGRAPHIC APPARATUS AND DATA RECONSTRUCTION METHOD 审中-公开
标题翻译：部分风扇光束计算机和数据重建方法
公开(公告)号：WO1992000566A1
公开(公告)日：1992-01-09
申请号：PCT/US1991004776
申请日：1991-07-02
申请人： VARIAN ASSOCIATES, INC.
发明人： VARIAN ASSOCIATES, INC. , SEPPI, Edward, J. , PAVKOVICH, John, M.
IPC分类号： G06F15/42
CPC分类号： G06T11/005
摘要： A computed tomography method and apparatus for sequentially projecting partial fan beams through a sample (32), measuring data resulting from each projection, and generating an image of a sample section from the measured data without reordering the measured data to simulate data obtained by projecting parallel ray beams through the sample (32). Partial fan beam radiation received at a detector array (44) is processed to image a larger diameter sample section than could be imaged with full fan beams projected from the same source to the same detector array (44) with the same source-to-detector spacing(s). Preferably, X-ray radiation is transmitted through the sample (32) and the system includes an image intensifier tube (40) for receiving data representing at least a portion of the transmitted radiation. Preferably, the invention includes a linear detector array (44) which receives the image intensifier tube output and an extension detector array (45) which receives partial fan beam radiation which has propagated through the sample but which is not incident at the image intensifier tube. The data measured during each partial fan beam scan are preferably weighted to simulate full fan beam data. The weighted partial fan data signals are then processed in the same way as if they were unweighted data signals resulting from exposure of the sample (32) to full fan beams.
摘要翻译：一种计算机断层摄影方法和装置，用于顺序地将部分扇形光束通过样本（32）投影，测量由每个投影产生的数据，并且从所测量的数据生成样本部分的图像，而不对所测量的数据进行重新排序以模拟通过投影并行获得的数据射线束穿过样品（32）。处理在检测器阵列（44）处接收到的部分风扇光束辐射被处理以对比可以从具有相同源到检测器的相同源投射到相同检测器阵列（44）的全扇形光束成像的更大直径的采样部分成像间距（S）。优选地，X射线辐射透射通过样品（32），并且系统包括用于接收表示透射辐射的至少一部分的数据的图像增强管（40）。优选地，本发明包括接收图像增强管输出的线性检测器阵列（44）和延伸检测器阵列（45），所述延伸检测器阵列接收已经传播通过样品但不入射在图像增强管上的部分扇形束辐射。在每个部分扇形波束扫描期间测量的数据优选地被加权以模拟全扇形波束数据。然后以与从样品（32）暴露于全扇形光束而得到的未加权数据信号相同的方式处理加权的部分风扇数据信号。

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