Multi-modality imaging is a possible solution for overcoming individual modality limitations. With the use of modality specific contrast agents, contrast-enhanced multi-modality imaging may provide a more comprehensive evaluation of tumour characteristics. This may be possible by combining ultrasound and magnetic resonance imaging, whose contrast agents behave differently within the microvasculature. A novel, microvascular, and leaky phantom is presented that permits ultrasound contrast agents to remain entirely within the mimicking vascular compartment while the magnetic resonance contrast agents may freely diffuse between the mimicking vasculature and tissue compartments. The results show that the phantom is a useful tool for investigating the combination of contrast-enhanced ultrasound and magnetic resonance imaging. This work motivates further combined contrast-enhanced imaging studies, with future work to incorporate additional modalities.

Multi-modality imaging is a possible solution for overcoming individual modality limitations. With the use of modality specific contrast agents, contrast-enhanced multi-modality imaging may provide a more comprehensive evaluation of tumour characteristics. This may be possible by combining ultrasound and magnetic resonance imaging, whose contrast agents behave differently within the microvasculature. A novel, microvascular, and leaky phantom is presented that permits ultrasound contrast agents to remain entirely within the mimicking vascular compartment while the magnetic resonance contrast agents may freely diffuse between the mimicking vasculature and tissue compartments. The results show that the phantom is a useful tool for investigating the combination of contrast-enhanced ultrasound and magnetic resonance imaging. This work motivates further combined contrast-enhanced imaging studies, with future work to incorporate additional modalities.

Graduation date: 1994

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Modal logics with possible worlds semantics can be used to represent mental states such as belief, goal, and intention, allowing one to formally describe the rational behavior of agents. Agent??s beliefs and goals are typically represented in these logics by primitive modal operators. However, the representation of agent??s intentions varies greatly between theories. Some logics characterize intention as a primitive operator, while others define intention in terms of more primitive constructs. Taking the latter approach is a theory due to Philip Cohen and Hector Levesque, under which intentions are a special form of commitment or persistent goal. The theory has motivated theories of speech acts and joint intention and innovative applications in multiagent systems and industrial robotics. However, Munindar Singh shows the theory to have certain logical inconsistencies and permit certain absurd scenarios. This thesis presents a modification of the theory that preserves the desirable aspects of the original while addressing the criticism of Singh. This is achieved by the introduction of an additional operator describing the achievement of expectations, refined assumptions, and new defi- nitions of intention. The modified theory gives a cogent account of the rational balance between agents?? action and deliberation, and suggests the use of meansends reasoning in agent implementations. A rule-based reasoner in Jess facilitates evaluation of the predictiveness and intuitiveness of the theory, and provides a prototypical agent based on the theory.

Thesis (M.S.)--University of Florida, 2001. / Title from first page of PDF file. Document formatted into pages; contains ix, 65 p.; also contains graphics. Vita. Includes bibliographical references (p. 63-64).

Thèse d'exercice : Pharmacie : Université de Nantes : 2003. / Bibliogr. f. 71-75.

Thesis (M.A. (Psychology)--University of Pretoria, 2001. / Includes bibliographical references (p 143-152).

Thesis (Ph. D.)--University of Wisconsin--Madison, 2000. / Includes bibliographical references (leaves 213-223). Also available on Internet.

Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 2004. / Field problem. Includes bibliographical references.