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Title: THz medical imaging : with an emphasis on dental tissues
Author: Crawley, D.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2003
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This thesis concerns imaging with THz radiation. Principally this thesis examines the problem of using THz for medical imaging, concentrating on problems relating to dentistry. In Chapter 1 the background is introduced. Chapters 2, 3 and 4 are broadly chapters covering techniques. Chapter 2 discusses the basics of the main imaging systems used for this research. Chapter 3 introduces the idea that imaging is effectively an information gathering process and outlines some novel techniques for analysing optics using these concepts. In particular the concept that the transmission of information requires the transmission of a commensurate amount of energy is put forward. This leads to key wavelength independent results such as limitations on the detail that may be observed in a live tissue that cannot tolerate absorbing more than a certain amount of energy. Chapter 4 discusses the design, construction and optimisation of high power Thz systems, including the construction of high speed, high voltage pulsed power systems to bias high repetition rate, wide aperture emitters for enhanced THz output. The following chapters 5, 6, 7, 8 and 9 present the main experimental results. Chapter 5 principally concerns determining the basic THz optical properties of dental tissues for the following chapters. Chapter 5 demonstrates that it is possible to detect early stage caries by looking for an increased absorption of THz and shows that this is possible in hemi-sected teeth as well as whole teeth. Chapters 6 and 7 principally discuss 3-dimensional imaging and demonstrate that tomographic imaging of human teeth is possible and can be used to measure the thickness of enamel, which may be useful for enamel erosion monitoring.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available