| 摘要 |
PURPOSE:To always perform the best imaging, by inserting a peak shift correction circuit between a detection part and a data processing part. CONSTITUTION:A peak shift correction circuit 20 is inserted between a detection part 10 and a data processing part 40. When gamma-rays are incident, the light emitted from a scintillator 11 is sent to an energy/position operating circuit 15 through PMTs13 and preamplifiers 14, and an unblank signal UNB, an energy signal E and position signals X, Y are obtained from the circuit 15. The count value of a counter 22 and a signal obtained by converting the signal E by an A/D converter 23 are encoded by an encoder 24 to be stored in a memory 25 and a correction quantity DELTAE read is converted by a D/A converter 26 to be subtracted 27 from the signal E and peak shift is corrected. The corrected energy signal E' is outputted to a data processing part 40 through a sample holding circuit (SH)28. Further, the position signals X', Y' and the unblank signal UNB' from a timing controller 21 are outputted to the processing part 40 and an peak analyzer 41 discriminates whether or not the peak of the signal E' has entered a preset energy window.
|
