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    • 28. 发明申请
    • METHOD AND APPARATUS FOR TREATMENT OF SIGNALS OBTAINED FROM PHOTOMULTIPLIER TUBES
    • 用于处理从光电管获得的信号的方法和装置
    • WO2006043147A3
    • 2009-09-24
    • PCT/IB2005003098
    • 2005-10-17
    • I S E INGEGNERIA DEI SISTEMI EDI BENE GIULIOCREMONCINI ANDREASANI ANTONIOBIANCHI DANIELELAZZAROTTI MARCO
    • DI BENE GIULIOCREMONCINI ANDREASANI ANTONIOBIANCHI DANIELELAZZAROTTI MARCO
    • G01T1/208G01T1/29
    • G01T1/208A61B6/037G01T1/2985
    • An apparatus for treatment of signals obtained from photomultiplier tubes, in particular for carrying out a PET, by at least one couple of scintillators associated to photomultiplier tubes (100, 200). For each head (100) of sensors, a relative phototube (3) generates current pulses that are weighed by two resistive chains (6), each of which generates two output currents, and respectively X'A, X'B for the first chain and Y'A, Y'B for the second chain. The phototube (3) generates also a synchronization signal (S'), or last dynode signal, that serves as signals synchronism indicator for a coincidence comparation with signals coming from the other phototube of a paired head (200). The current pulses are transformed into voltage pulses and processed by correcting circuits (40, 41, 42 and 43), obtaining respective transformed signals XA, XB, and YA, YB, whereas the last dynode signals S' are amplified at S by a amplifying block (44). The signals reach a board (47) that carries out a sampling of the signals, their conversion into numeric values, a coincidence comparation and transfers them to a PC (49) through an USB interface (48). The software present on the PC (49) computes then the received signals and carries out a reconstruction of the images, which are then final result of the PET. The correcting circuits (40, 41, 42 and 43) of the position signals of the phototube at the same obtain a position signal with a controlled peak value, in order to retrieve the position immediately after the detection of a coincidence, and a quick decay of the signals after the peak value, within a time such that the probability of pile-up between different signals is minimum.
    • 用于通过与光电倍增管(100,200)相关联的至少一对闪烁体处理从光电倍增管获得的信号,特别是用于执行PET的装置。 对于传感器的每个头部(100),相对光电管(3)产生由两个电阻链(6)称重的电流脉冲,每个电阻链产生两个输出电流,并且分别产生用于第一链的X'A,X'B 和Y'A,Y'B为第二连锁。 光管(3)还产生同步信号(S')或最后的倍增电极信号,其用作与来自成对磁头(200)的另一个光控管的信号进行一致比较的信号同步指示符。 电流脉冲被变换为电压脉冲,并通过校正电路(40,41,42和43)进行处理,获得各自的变换信号XA,XB和YA,YB,而最后的倍增电极信号S'在S处被放大 块(44)。 信号到达板(47),其执行信号采样,转换成数值,重合比较,并通过USB接口(48)将其传送到PC(49)。 存在于PC(49)上的软件计算接收到的信号并执行图像的重建,这是PET的最终结果。 在同一光电管的位置信号的校正电路(40,41,42和43)获得具有受控峰值的位置信号,以便在检测到重合之后立即检索位置,并且快速衰减 的峰值之后的信号,使得不同信号之间堆积的概率最小。