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8 条记录 (耗时 0.012 秒)

    CURRENT MODE ANALOG SIGNAL MULTIPLEXOR
    2.
    发明授权
    CURRENT MODE ANALOG SIGNAL MULTIPLEXOR 失效
    模拟智能混合器在STROMBETRIEBSART

    公开(公告)号：EP0883930B1

    公开(公告)日：2005-03-02

    申请号：EP97949489.5

    申请日：1997-11-19

    申请人： Varian Medical Systems Technologies, Inc.

    发明人： ALLEN, Max, J. ,  COLBETH, Richard, E. ,  MALLINSON, Martin

    IPC分类号： H03K17/62

    CPC分类号： H03K17/6264 ,  H03K17/04113

    摘要： A current mode analog signal multiplexor includes multiple input multiplexed differential amplifiers (12, 14), a reference amplifier ( 12.0, 14.0) and an output differential current amplifier (18, 20). An input multiplex control signal selects and enables one of the input multiplexed differential amplifiers for buffering and steering the input signal current to one side of the output differential current amplifier. The reference amplifier drives the other side of the output differential current amplifier. The output node of the output differential current amplifier remains at a substantially constant voltage potential while providing an output current which varies in relation to the selected input signal.

    PIPELINED SAMPLE AND HOLD CIRCUIT WITH CORRELATED DOUBLE SAMPLING
    5.
    发明授权
    PIPELINED SAMPLE AND HOLD CIRCUIT WITH CORRELATED DOUBLE SAMPLING 失效
    与流水线结构双重相关信号SCAN采样保持电路

    公开(公告)号：EP0882295B1

    公开(公告)日：2004-02-04

    申请号：EP97949488.7

    申请日：1997-11-19

    申请人： Varian Medical Systems Technologies, Inc.

    发明人： MALLINSON, Martin ,  ALLEN, Max, J. ,  COLBETH, Richard, E.

    IPC分类号： G11C27/02

    CPC分类号： G11C27/026

    摘要： A signal sampling circuit for performing correlated double sampling (CDS) of an input signal with a pipelined sample and hold architecture includes a time multiplexed integrating amplifier circuit in which the output circuit is a pipelined sample and hold circuit which provides time multiplexed input signal samples and the feedback integration capacitor is discharged between samples. At all times, one of the channels of the pipelined sample and hold circuit is providing one of the time multiplexed input signal samples while the other channel continues tracking the input signal. The feedback integration capacitor acts as a clamp to null out residual reset noise received as part of the input signal to be sampled. Hence, with the exception of that very brief period of time necessary for switching between the two pipelined sample and hold circuit channels, one of the two pipelined sample and hold circuit channels is always available for signal acquisition.

    METHOD FOR DISPLAYING DIGITAL X-RAY IMAGE DATA AT HIGH RESOLUTION
    6.
    发明公开
    METHOD FOR DISPLAYING DIGITAL X-RAY IMAGE DATA AT HIGH RESOLUTION 有权
    一种用于获取数字X射线图像数据的方法

    公开(公告)号：EP1611776A2

    公开(公告)日：2006-01-04

    申请号：EP04706081.9

    申请日：2004-01-28

    申请人： Varian Medical Systems Technologies, Inc.

    发明人： COLBETH, Richard, E. ,  MOLLOV, Ivan, P.

    IPC分类号： H05G1/64

    CPC分类号： H04N5/3454 ,  A61B6/032 ,  H04N5/32

    摘要： A method for providing X-ray image data signals corresponding to a selected portion of a two-dimensional image at an enhanced image resolution. During selective exposure of an X-ray receptor to X-ray radiation corresponding to the subject image, image pixel data corresponding to the region of interest (used pixels) are read out with normal pixel data pixel discharge times and at the normal pixel data rate, while image pixel data corresponding to the region not of interest (unused pixels) are read out also with normal pixel data pixel discharge times and at either the normal pixel data rate or an increased pixel data rate. During such pixel data readout intervals, the X-ray radiation exposure can be continuous or selectively pulsed.

    MULTIPLE MODE DIGITAL X-RAY IMAGING SYSTEM
    7.
    发明授权
    MULTIPLE MODE DIGITAL X-RAY IMAGING SYSTEM 失效
    多模式的X射线图像记录系统

    公开(公告)号：EP0900428B1

    公开(公告)日：2005-08-31

    申请号：EP97950706.8

    申请日：1997-11-26

    申请人： Varian Medical Systems Technologies, Inc.

    发明人： COLBETH, Richard, E. ,  PAVOKOVICH, John, M. ,  SEPPI, Edward, J. ,  SHAPIRO, Edward, G.

    IPC分类号： G06T5/20

    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.