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    • 4. 发明授权
      US06396613B1 Optical high speed communications for a computed tomography x-ray machine 失效
    • Optical high speed communications for a computed tomography x-ray machine
    • 计算机断层扫描X光机的光学高速通信
    • US06396613B1
    • 2002-05-28
    • US09218638
    • 1998-12-22
    • Daniel David Harrison , Deva Narayan Pattanayak
    • Daniel David Harrison , Deva Narayan Pattanayak
    • H04B1012
    • A61B6/56 , H04B10/801
    • A computed tomography system employs an optical communications link to reliably transmit high data rate data. The communications link comprises an optical emitter, an optical transmission line, a plurality of optical deflectors disposed randomly within the transmission line, and an optical receiver. The optical emitter is attached to the gantry of the computed tomography system and extends along the length of the gantry. The optical emitter generates a high data rate optical data signal, which travels along the optical transmission line in correspondence with data generated by detector array on the gantry. The plurality of optical deflectors causes portions the high data rate optical data signal to be internally reflected and subsequently refracted from the transmission line. The optical receiver disposed near the transmission line detects the portion of high data rate data refracted from the transmission line.
    • 计算机断层摄影系统采用光通信链路可靠地传输高数据速率数据。 通信链路包括光发射器，光传输线，随机地布置在传输线内的多个光偏转器和光接收器。 光发射器连接到计算机断层摄影系统的台架，并沿着台架的长度延伸。 光发射器产生高数据速率光学数据信号，其沿着光传输线行进，与机架上的检测器阵列产生的数据相对应。 多个光学偏转器使得高数据速率光学数据信号的内部部分被内部反射并随后从传输线折射。 设置在传输线附近的光接收器检测从传输线折射的高数据速率数据的部分。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 5. 发明授权
      US06366231B1 Integrate and fold analog-to-digital converter with saturation prevention 失效
    • Integrate and fold analog-to-digital converter with saturation prevention
    • 集成和折叠具有饱和度预防的模数转换器
    • US06366231B1
    • 2002-04-02
    • US09546623
    • 2000-04-10
    • Naresh Kesavan Rao , Daniel David Harrison , Donald Thomas McGrath , Jerome Johnson Tiemann
    • Naresh Kesavan Rao , Daniel David Harrison , Donald Thomas McGrath , Jerome Johnson Tiemann
    • H03M150
    • H03M1/141 , H03M1/1215 , H03M1/60
    • An analog to digital conversion circuit for converting an analog input signal into a plurality of binary output bits includes an operational amplifier and an integrating capacitor for storing a charge proportional to the integral of the input signal. A charge subtracting circuit removes a first predetermined charge from the integrating capacitor when an output charge of the operational amplifier is substantially equal to a second predetermined charge. The first predetermined charge level is removed from the integrating capacitor a number of times. The removal of the first predetermined charge from the integrating capacitor allows the integral of the analog input signal to be larger than a maximum charge capable of being stored by the integrating capacitor. A digital logic circuit tracks the number of times that the first predetermined charge is removed from the integrating capacitor by the charge subtracting circuit, and the digital logic circuit provides at least one bit of the plurality of binary output bits. A residue quantizing circuit determines a residual charge in the integrating capacitor and provides at least one additional bit of the plurality of binary output bits corresponding to the residual charge. The residual charge is substantially equal to a stored charge in the integrating capacitor after the first predetermined charge has been removed the number of times.
    • 用于将模拟输入信号转换成多个二进制输出位的模数转换电路包括运算放大器和用于存储与输入信号的积分成比例的电荷的积分电容器。 当运算放大器的输出电荷基本上等于第二预定电荷时，电荷减去电路从积分电容器去除第一预定电荷。 第一预定电荷电平从积分电容器中多次去除。 从积分电容器去除第一预定电荷允许模拟输入信号的积分大于能够由积分电容器存储的最大电荷。 数字逻辑电路跟踪由电荷减法电路从积分电容器去除第一预定电荷的次数，数字逻辑电路提供多个二进制输出位的至少一位。 残余量化电路确定积分电容器中的残余电荷，并提供与剩余电荷相对应的多个二进制输出位中的至少一个附加位。 残余电荷基本上等于在第一预定电荷已被去除次数之后积分电容器中的存储电荷。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 6. 发明申请
      US20120069952A1 SYSTEM AND METHOD OF SPECTRAL CALIBRATION AND BASIS MATERIAL DECOMPOSITION FOR X-RAY CT SYSTEMS 有权
    • SYSTEM AND METHOD OF SPECTRAL CALIBRATION AND BASIS MATERIAL DECOMPOSITION FOR X-RAY CT SYSTEMS
    • X射线CT系统的光谱校准和基础材料分解系统与方法
    • US20120069952A1
    • 2012-03-22
    • US12883631
    • 2010-09-16
    • Xiaoye Wu , Dan Xu , Naveen Chandra , Zhanyu Ge , Jiang Hsieh , Daniel David Harrison , Mary Sue Kulpins
    • Xiaoye Wu , Dan Xu , Naveen Chandra , Zhanyu Ge , Jiang Hsieh , Daniel David Harrison , Mary Sue Kulpins
    • A61B6/03
    • A61B6/583 , A61B6/032 , A61B6/482 , A61B6/585
    • An imaging system includes an x-ray source that emits a beam of x-rays toward an object, a detector that receives high frequency electromagnetic energy attenuated by the object, a data acquisition system (DAS) operably connected to the detector, and a computer operably connected to the DAS. The computer is programmed to compute detector coefficients based on a static low kVp measurement and a static high kVp measurement, capture incident spectra at high and low kVp during fast kVp switching, compute effective X-ray incident spectra at high and low kVp during fast kVp switching using the captured incident spectra, scan a water phantom and normalize the computed detector coefficients to water, adjust the computed effective X-ray incident spectra based on the normalized detector coefficients, compute basis material decomposition functions using the adjusted X-ray incident spectra, and generate one or more basis material density images using the computed basis material decomposition functions.
    • 成像系统包括：x射线源，其朝向物体发射X射线束;接收被物体衰减的高频电磁能的检测器;可操作地连接到检测器的数据采集系统（DAS）;以及计算机 可操作地连接到DAS。 计算机被编程为基于静态低kVp测量和静态高kVp测量来计算检测器系数，在快速kVp切换期间在高和低kVp处捕获入射光谱，在快速kVp期间计算高和低kVp处的有效X射线入射光谱 使用捕获的入射光谱切换，扫描水体模型并将计算的检测器系数归一化为水，基于归一化的检测器系数调整计算的有效X射线入射光谱，使用调整的X射线入射光谱计算基础材料分解函数， 并使用所计算的基础材料分解函数生成一个或多个基础材料密度图像。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Global Dossier Espacenet 法律信息 同族专利 专利引用
    • 7. 发明授权
      US06324213B1 Asset tracking system employing reduced order GPS with compressed GPS satellite identification data 有权
    • Asset tracking system employing reduced order GPS with compressed GPS satellite identification data
    • 资产跟踪系统采用降序GPS与压缩GPS卫星识别数据
    • US06324213B1
    • 2001-11-27
    • US09388085
    • 1999-09-01
    • Daniel David Harrison
    • Daniel David Harrison
    • H04B166
    • B61L25/021 , B61L25/025 , B61L2205/04 , G01S19/06 , G01S19/09 , G01S19/34
    • Satellite identification data generated when using the Reduced Order GPS (ROGPS) system are compressed, allowing for shorter data transmission times, reduced transmitter energy and reduced satellite channel occupancy. An indexed list of all possible constellations of a subset of all satellites is created. This list is then used at both the tracked object location and the central station to which the satellite identifications must be sent. At the tracked object location, the chosen satellite GPS indices are identified and the list index is found, encoded, and transmitted with only enough bits to uniquely identify it from all other indices in the list. At the central station, the received list index is used to find the satellite constellation corresponding to the chosen satellite GPS indices. The number of bits used to encode the index can be further reduced by reducing the indexed list size. This can be done at both the tracked object and the central station by using a priori knowledge to reduce the possible number of satellites from the full GPS set down to only those that could possibly be visible from the object to be tracked location at a given time.
    • 使用简化GPS（ROGPS）系统时生成的卫星识别数据被压缩，允许更短的数据传输时间，减少的发射机能量和减少的卫星信道占用。 创建所有卫星子集的所有可能星座的索引列表。 然后，该列表用于必须发送卫星标识的跟踪对象位置和中心站。 在跟踪对象位置，识别所选择的卫星GPS索引，并且仅发现足够的比特来发送，编码和发送列表索引，以便从列表中的所有其他索引中唯一地识别该索引。 在中心站，接收到的列表索引用于找到对应于所选择的卫星GPS指标的卫星星座。 通过减少索引列表大小，可以进一步减少用于编码索引的比特数。 这可以通过使用先验知识来将跟踪对象和中心站两者在完整GPS集中的可能数量减少到仅在给定时间内可被跟踪的对象可能可见的那些 。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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