To develop high resolution gamma camera

a novel readout method is adopted.The detector of the gamma camera is based on CsI(Na) scintillation crystal array coupling with position-sensitive photomultiplier(PSPMT).The novel readout scheme utilizes the truncated center-of-gravity(TCOG) method

which hybridizes the conventional re-sistive readout and the individual analogue readout.The TCOG design was tested on a readout circuit board made by ourselves.As a result

the gamma camera could achieve an intrinsic spatial-resolution of 1 mm.The field-of-view(FOV) was also improved to cover the active area of the detector.In conclusion

the TCOG method is an effective approach to developing high-resolution compact gamma camera.This method can also be used in the newly high-integrated multi-anode PSPMT.