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    • 16. 发明申请
    • Method and apparatus to recover a deal pixel in digital imaging systems
    • 在数字成像系统中恢复处理像素的方法和装置
    • US20060097179A1
    • 2006-05-11
    • US10541562
    • 2004-01-05
    • Michael PetrilloKim HansenThomas Karpati
    • Michael PetrilloKim HansenThomas Karpati
    • G01T1/20
    • G01T1/1644G01T1/1647
    • Gamma radiation events are received individually at elements of a detector array (18) at least one of the elements (P0) being defective. Each detector element converts incident radiation into a radiation event signal which is digitized by an analog-to-digital converter (42) into a coordinate position (x,y) on the detector array and energy (z). An event generator (48) generates radiation event signals for each defective element based on radiation events received at contributing elements, e.g., nearest neighbor elements (P1-P8). In a preferred embodiment, the contribution from each of the contributing elements is randomized by passing a token (56) among positions of a table (54) corresponding to each of the contributing elements. Each time a radiation event is received at the contributing element whose corresponding table position holds the token, that event also generates an event signal for the defective element and the token is passed (58). The energy of the generated event for the defective detector element is randomized (62), such as by replacing the least significant bits with random numbers.
    • 在检测器阵列(18)的元件处单独接收伽马辐射事件,至少一个元件(P 0)是有缺陷的。 每个检测器元件将入射辐射转换成由模拟数字转换器(42)数字化为检测器阵列上的坐标位置(x,y)和能量(z)的辐射事件信号。 事件发生器(48)基于在诸如最近邻元素(P 1 -P 8)的贡献元件处接收到的辐射事件来为每个缺陷元件产生辐射事件信号。 在优选实施例中,通过在对应于每个贡献元素的表(54)的位置之间传递令牌(56)来随机分配来自每个贡献元素的贡献。 每当在其对应的表位置保持令牌的贡献元件处接收到辐射事件时,该事件也为缺陷元件生成事件信号,并且令牌被通过(58)。 用于缺陷检测器元件的生成事件的能量被随机化(62),例如通过用随机数替换最低有效位。