A time-compensation method and apparatus

The present invention discloses a method and apparatus for time compensation, the method comprising: operating state of the at least two signal acquisition module arranged to compensate for the time mode; control signal processing module generates a test signal and the clock signal, so that at least two signal acquisition modules using a test signal and the clock signal time indices, and using the signal processing module calibrations each time the signal acquisition module measuring time compensation value calculated, and further by using the time value of the time scaling compensation value correction signal acquisition module; at least two signal acquisition time calibration when the correction value module satisfying the predetermined condition, the operating state of the at least two signal acquisition modules is set to the operation mode, so that each of the signal acquisition module using the time offset value corresponding to each of the photomultiplier tube output to PET time measurement of the electrical signal. Thus, measurement errors can be eliminated their difference, working environment and other factors caused by discrete devices, improving the accuracy of time measurement.