This document describes the development of control systems for positron emission tomography (PET) detectors. It outlines improvements made to the existing ClearPEM Detector Control System, including more robust power supply and temperature monitoring. A new ClearPEM-Sonic Detector Control System was developed with additional chiller control and service board monitoring capabilities. The service boards for both systems were calibrated, achieving high precision for threshold voltage, bias voltage, and temperature measurement. Testing showed the systems function reliably and can handle error conditions.

1. Development and Implementation of the ClearPEM-Sonic Detector Control SystemGonçalo Nuno Bento Duarte da SilvaSupervisor: Prof. João Manuel Coelho dos Santos VarelaCo-Supervisor: Prof. Maria Helena da Costa Matos SarmentoInstituto Superior Técnico – September 10, 2010 bento@lip.pt

2. Outline2 Introduction

3. ClearPEM Detector Control System

4. ClearPEM-Sonic Detector Control System

5. Service Boards Calibration

6. ConclusionsPositron Emission Tomography3 PET is a metabolic imaging technique used in cancer detection.

7. Patient injected with a radiotracer.ClearPEM ClearPEM-Sonic

8. Scanner’s Hardware4ISEG

9. Detector Heads’ Electronics551 Super Module:12 detector modules

10. 2 APD arrays

11. 1 Crystal array

12. 2 Frontend Electronic Boards (FEBs)

13. 2 ASICs

14. PT100 probesDetector Heads’ Electronics66Service Boards Provide low voltage to the FEBs.

15. Provide 32 threshold voltages (Vth).

16. Provide 32 HVs to bias the APDs.

17. Monitor temperature.Thesis Objectives7 To study and improve the ClearPEM Detector Control System.

18. To develop the ClearPEM-Sonic Detector Control System.

19. To calibrate the ClearPEM-Sonic Service Boards.ClearPEM DCS8Main function:

20. Control and monitor the ClearPEM hardware.

21. Power supplies

22. Service Boards

23. Data Acquisition ElectronicsState Machine

24. ClearPEM DCS9Kepco LV power supplies

25. GPIB (SCPI)

26. Set output

27. Voltages & Currents

28. ISEG HV power supplies

29. CAN bus (C++ DLL)

30. Set output

31. Voltages & Currents