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Investigation of problems created in SPECT images by artifacts in the attenuation map and correction methods Chang, Zheng

Abstract

This thesis consists of five chapters. Chapter 1 presents the basic ideas of SPECT imaging. This chapter also explains the phenomenon of attenuation and shows how the attenuation effect affects SPECT imaging. Chapter 2 reviews various attenuation estimation methods and attenuation compensation methods. The advantages and disadvantages of these methods are discussed in this chapter. Moreover, this chapter discusses three artifacts such as missing counts, truncation and cross-talk effect, and their corrections. Additionally, this chapter presents three map reconstruction methods: FBP, OSEM and OSTGS. OSTGS has been tested by using computer simulations described in Chapter 3. Chapter 3 presents transmission simulations performed analytically. The analytical transmission simulations can be used to simulate simultaneous transmission /emission data acquisition by combining Monte Carlo SLMSET emission simulations. Different reconstruction methods have been tested in this computer simulation and the thorax phantom experiment described in Chapter 4. The results of these tests indicate that the cross-talk correction performance achieved by using OSTGS is better than that achieved by using conventional subtraction cross-talk correction. Finally, a summary is presented in Chapter 5 in which three topics for future work are being discussed.

Item Metadata

Title
Investigation of problems created in SPECT images by artifacts in the attenuation map and correction methods
Creator
Chang, Zheng
Publisher
University of British Columbia
Date Issued
2002
Description
This thesis consists of five chapters. Chapter 1 presents the basic ideas of SPECT imaging. This chapter also explains the phenomenon of attenuation and shows how the attenuation effect affects SPECT imaging. Chapter 2 reviews various attenuation estimation methods and attenuation compensation methods. The advantages and disadvantages of these methods are discussed in this chapter. Moreover, this chapter discusses three artifacts such as missing counts, truncation and cross-talk effect, and their corrections. Additionally, this chapter presents three map reconstruction methods: FBP, OSEM and OSTGS. OSTGS has been tested by using computer simulations described in Chapter 3. Chapter 3 presents transmission simulations performed analytically. The analytical transmission simulations can be used to simulate simultaneous transmission /emission data acquisition by combining Monte Carlo SLMSET emission simulations. Different reconstruction methods have been tested in this computer simulation and the thorax phantom experiment described in Chapter 4. The results of these tests indicate that the cross-talk correction performance achieved by using OSTGS is better than that achieved by using conventional subtraction cross-talk correction. Finally, a summary is presented in Chapter 5 in which three topics for future work are being discussed.
Extent
17203621 bytes
Genre
Thesis/Dissertation
Type
Text
File Format
application/pdf
Language
eng
Date Available
2009-08-20
Provider
Vancouver : University of British Columbia Library
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
DOI
10.14288/1.0085132
URI
http://hdl.handle.net/2429/12413
Degree
Master of Science - MSc
Program
Physics
Affiliation
Science, Faculty of; Physics and Astronomy, Department of
Degree Grantor
University of British Columbia
Graduation Date
2002-11
Campus
UBCV
Scholarly Level
Graduate
Aggregated Source Repository
DSpace

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Rights

For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.