Study of continuous DOI positioning for solid-state PET detectors = 양전자방출단층촬영장치에서 고체형 검출기의 연속적 상호작용 깊이 결정에 관한 연구

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PET is a nuclear imaging technique that measures the spatial and temporal distribution of compounds labeled with a positron emitting radionuclide introduced into a subject to be determined non-invasively. Spatial resolution degradation occurs at the edge of Field Of View (FOV) due to parallax error. To improve spatial resolution at the edge of FOV, Depth-Of-Interaction (DOI) PET has been investigated and there are several methods for DOI positioning. Among DOI positioning methods, sharing scintillation light output is the cost-effective and accurate method while solid-state photosensors such as Avalanche Photodiodes have been well developed. Avalanche photodiodes have internal gain by impact ionizations in high electric field. High gain and low noise are good characteristics for use in PET. In this thesis, DOI-PET detector using two APD with LSO scintillation crystal was designed and evaluated, and parameter to affect DOI positioning was investigated. Energy resolution of the designed detector was 12 % in 662 keV photopeak. Comparing photopeak channels of two APD output, DOI position was measured. DOI positioning error was ±2.5 mm. DOI resolution in current DOI-PET systems is still ~ cm. Minimum 4 step positions can be obtained with 2 cm long LSO crystal in this result.
Advisors
Cho, Gyu-Seongresearcher조규성researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2007
Identifier
264919/325007  / 020053486
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2007.2, [ v, 41 p. ]

Keywords

Depth Of Interaction; Positron Emission Tomography; Avalanche Photodiode; 사태광다이오드; 상호작용 깊이 결정; 양전자방출촬영장치

URI
http://hdl.handle.net/10203/49528
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=264919&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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