Introducing of Novel Method to Improve the Process of Imaging in a Gamma Camera Equipped with Square PMTs

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Amir Mozafari Sabet, Kiarash | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52795 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Bagheri Shouraki, Saeed; Fatemizadeh, Emad; Ay, Mohammad Reza
Abstract:
The gamma cameras, based on scintillation crystal followed by an array of photomultiplier tubes (PMTs), play a crucial role in nuclear medicine. The use of square PMTs provides the minimum dead zones in the camera. The camera with squared PMTs also reduces the number of PMTs relative to the detection area.In this thesis, we introduced a new read-out method whereby the total cost of the read-out board will be decreased by a factor of 2.4; in return, the energy and spatial resolution of the system will be reduced by 0.3% and 0.4% respectively. We also implemented a positioning module in the FPGA chip via that the transmission rate between FPGA and the computer will be tripled, and the computational burden will be moved from PC into FPGA. At last, we developed a novel method with using of SOM neural network, for improving the energy calibration in gamma camera by means of which the total imaging time for computing energy calibration will be divided by ten, and the accuracy of this calibration will be improved by 1.7%
Keywords:
Gama Camera ; Gamma Rays ; Readout Loop ; Field Programmable Gate Array (FPGA) ; Gamma Photon Positioning ; Self-Organizing Map (SOM)Nueral Networks ; Square Photomultiplier Tubes (PMTs) ; Energy Calibration