532 results on '"Bruza P"'
Search Results
202. Concept combination, emergence and abduction
- Author
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Bruza, P. D., primary
- Published
- 2010
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203. Time-gated imaging of protoporphyrin delayed fluorescence shows high hypoxia contrast in pancreatic cancer.
- Author
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PETUSSEAU, Arthur, BRUZA, Petr, and POGUE, Brian
- Abstract
Surgical guidance with fluorescent tracers has seen significant adoption in the last decade
1 , including the ability to image tissue perfusion2,3 . More recently, tissue metabolism tracers have been approved for human use, such as protoporphyrin IX (PpIX)4,5 , which is induced by oral or topical administration of aminolevulinic acid (ALA)6 . One of the most striking things about the ALA-PpIX system is that it is produced throughout most tissues of the body and demarcates glioma tumors in neurosurgery, skin lesions and bladder cancers. However, a less studied PpIX phenomenon in surgical guidance is its delayed fluorescence (DF) signal, which is directly related to the ambient oxygen level around it7,8 . The lack of oxygen, or hypoxia, induces a strong DF component which has significant relevance to oncology, where the vast majority of tumors have microregional hypoxia present9 . Hypoxia imaging for surgical guidance has never been possible, but here it is shown that PpIX emits unique signal in hypoxic tumor tissue regions, as a delayed fluorescence (DF) signal in the red to near-infrared spectrum. PpIX is endogenously synthesized by mitochondria in most tissues and the particular property of DF emission is directly related to low microenvironmental oxygen concentration10,11 . Most tumors have microregional chronic and/or cycling hypoxia present as well as chaotic blood flow. In this report, we show the first demonstration of imaging hypoxia signals from PpIX in a pancreatic cancer model, exhibiting >5X contrast relative to surrounding normal oxygenated tissues. Additionally, tissue palpation amplifies the signal and provides intuitive temporal contrast based upon neoangiogenic blood flow differences. This new mechanism for contrast could easily be translated to human use as an intrinsic contrast mechanism for oncologic surgical guidance. [ABSTRACT FROM AUTHOR]- Published
- 2023
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204. Augmenting Web Service Discovery by Cognitive Semantics and Abduction
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Bruza, P. D., primary, Barros, A., additional, and Kaiser, M., additional
- Published
- 2009
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205. Projecting Computational Sense of Self: A Study of Transition in a Chronic Illness Online Community
- Author
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McArthur, R., primary, Bruza, P., additional, Warren, J., additional, and Kralik, D., additional
- Published
- 2006
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206. Abduction in Semantic Space: Towards a Logic of Discovery
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Bruza, P., primary
- Published
- 2004
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207. Two-Stage Model for Information Filtering.
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Xujuan Zhou, Yuefeng Li, Bruza, P., Yue Xu, and Lau, R.Y.K.
- Published
- 2008
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208. Knowing and Indexical Psychology.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., and Day, Ronald E.
- Abstract
This chapter has two parts. The first part critiques mentalism in cognitive psychology and Knowledge Management theory's basis in mentalism. The second part proposes a reading of indexical psychology as an alternative to mentalism. The purpose of the chapter is to reposition our understanding of psychological events, including personal knowledge expressions, from a mysticism of private minds and their public representations to a conception of human agency constructing person and self through cultural forms and in social situations. Such an analysis leads to a breakdown of the "inner" and "outer" dichotomy which has formed the basis for much of psychological theory and for Knowledge Management theory (the latter in terms of a dichotomized notion of private knowledge and public mediums for that knowledge's representation). The view proposed here is that psychological research, including research into knowing acts, must begin with the understanding of persons and their selves as dynamically constructed by learning and by experience. In this way, this analysis also is associated with what is sometimes referred to as "activity theory." [ABSTRACT FROM AUTHOR]
- Published
- 2007
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209. Management of the Knowing and the Known in Transactional Theory of Action (TTA).
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Zacklad, Manuel
- Abstract
In this paper we will support a view that considers the explicitation of knowledge as being one among the diverse strategies allowing transferring the activities performed by a small community of action in a larger collective whose practices will have to be distributed spatially, socially and temporally. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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210. Knowledge Processes and Organizational Learning.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Nobre, Angela Lacerda
- Abstract
The present chapter discusses the different epistemologies behind different strands of management thinking and calls for the need for further theoretical development. It proposes a specific management methodology, Semiotic Learning, that corresponds to an innovative approach to the field of organizational learning, one that draws on social semiotics and on ontological hermeneutics in order to develop an integrative perspective to the individual and to the social dimensions of organizational learning. Pragmatism stands for the inseparable nature of the individual and the collective aspects of learning. Though many organizational learning theories draw on pragmatism, Semiotic Learning argues for the need to develop further this perspective because once its underlying assumptions are understood its consequences imply a radical shift in relation to dominant management thinking. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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211. Consumer Knowledge, Social Sensemaking and Negotiated Brand Identity.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Mandelli, Andreina
- Abstract
Strong consumer brands have shifted, lately, from a traditional—advertising-based—way of communicating with consumers to a more interactive and networked approach, which often include relevant investments in a brand community. A brand community is described in the literature as "a specialized, nongeographically bound community, based on a structured set of social relations among admirers of a brand." These communities play a relevant role in building a stronger bond between brands and consumers, so that the affective ties tend to transform in advocative consumer behavior and loyal relationships. But brand communities can also provide a number of valuable learning opportunities for both customers and the organizations that sponsor them. This paper wants to explore the process through which these learning objectives are met, and the social level variables that influence the nature and the evolution of this process. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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212. Sensemaking and the Creation of Social Webs.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Ipe, Minu
- Abstract
Narratives have long remained unacknowledged as knowledge processes within organizations. Narratives are so ubiquitous in nature and so taken-for-granted that they have remained in the shadow of formal knowledge management initiatives and programs. Yet, they play a critical role in the creation, transmission and application of knowledge in the workplace. This chapter addresses two types of narratives—storytelling and conversations. The role of these narratives as knowledge processes is examined, especially their contribution to sensemaking and the creation of social webs in work settings. How storytelling and conversations can be enabled within the contexts of designing work, workspaces, and enabling these narratives in virtual and global organizations is also briefly discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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213. The Critical Role of the Librarian/Information Officer as Boundary Spanner Across Cultures.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Mason, Robert M.
- Abstract
As libraries become increasingly based on digital storage and~access technologies, knowledge management approaches seem particularly useful. Most knowledge management systems emphasize the role of information and communications technologies, and the question arises about the role of librarians in these systems. This paper posits that if globally digital libraries are to realize their potential for providing access to the widest feasible range of knowledge, librarians and information officers need to fulfill a challenging and critical role as boundary spanners across cultures. This paper is based on evidence that knowledge is culturally derived, acquired, and applied, and that learning —the acquisition of new knowledge—is enabled by skills that are culturally dependent. This aspect of knowledge suggests that the tacit dimension of knowledge and learning may require humans to aid in spanning the boundaries across different knowledge domains and different cultures. This paper has three components. First, it reviews what is becoming known about learning and how this relates to knowledge creation and knowledge transfer. Second, it reviews a boundary spanning model proposed by Carlile, comprised of three levels—syntactic, semantic, and pragmatic—and applies this model to learning across cultures. Finally, the paper discusses the implications of such a model of knowledge for libraries that seek to serve as global resources for multiple cultures. For digital libraries, new skills and approaches may be required for the pragmatic category [ABSTRACT FROM AUTHOR]
- Published
- 2007
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214. Knowledge Processes and Communication Dynamics in Mobile Telework.
- Author
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Hislop, Donald
- Abstract
This chapter links together a practice based perspective on knowledge with the interests of the ‘‘virtual working'' literature on how the technological mediation of communication in such processes affects the nature of the social relationships that exist between workers. For example this literature suggests that it is more difficult to develop and sustain interpersonal trust than when significant opportunities for face-to-face interaction exist. As the practice based perspective on knowledge emphasizes the impact that interpersonal communication has on knowledge processes this represents an interesting context within which to examine the relationship between communication dynamics and knowledge processes. Further, the practice based perspective on knowledge regards processes of knowing as being embedded in, sustained through, and developed via the specific (and typically collective) work activities that people carry out. Thus to research and understand the process of knowing that workers are involved in requires an empirical focus on their work activities (Orlikowski 2002). This chapter therefore examines the knowledge processes and communication dynamics of some virtual workers by paying close attention to their work tasks. The specific type of virtual workers examined are mobile teleworkers, a relatively neglected sub-group in the population of teleworkers/virtual workers. These are workers who require to be spatially mobile to conduct their work, traveling between different sites. The chapter shows how the specific spatial mobility patterns of the workers examined had a significant effect on the communication dynamics of their interactions with co-workers. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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215. Where and When was Knowledge Managed?
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., Davenport, Elisabeth, and Horton, Keith
- Abstract
The chapter presents a case study of new technology in a rapid response social work unit that is part of an e-government program in a Scottish municipality. The objective of the project was to improve the configuration and delivery of resources for housebound clients, and it was construed as a simple knowledge integration exercise by senior management. Taking a social informatics perspective, the authors interpret the case in terms of competing discourses or multiple versions of KM, and suggest that KM versioning is a characteristic, but underexplored, feature of complex projects that involve multiple actors with different knowledge trajectories. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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216. Managing Knowledge for Innovation.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Swan, Jacky
- Abstract
This chapter aims to provide a review and critique of shifts in dominant ways of thinking about the relationship between knowledge management and innovation, both in terms of the assumptions they make about knowledge (and knowledge management) and the assumptions they make about innovation processes. Thus, three broad perspectives, referred to here as "production," "process," and "practice" perspectives are contrasted. These perspectives are outlined briefly below and illustrated, in the chapter, by drawing from examples from our IKON (Innovation, Knowledge and Oragnizational Networks) Research Centre. In contrasting these perspectives, I argue, not that one or other is necessarily superior, but rather that each has its own set of assumptions, and limitations, regarding the nature of knowledge and innovation. Viewing the knowledge management through these different lenses makes it possible to rethink the paradoxes and tensions around attempts to manage knowledge in innovation contexts. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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217. Can Organizations Really Unlearn?
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., Turc, Emil, and Baumard, Philippe
- Abstract
The complex phenomenon of organizational change is a continuous challenge for scientists and for practitioners alike. Simple models tend to be regularly worn out by field evidence. More and more factors must be taken into account in order to ensure a better reliability of change models. A recently proposed solution suggests that learning theory should be placed more centrally within the theory of planned organizational change (Hendry, 1996; Schein, 1993; Kilmann, 1989). However, this research direction has already been broached, although under a slightly different perspective. Early studies (Starbuck and Heberg, 1976; Hedberg et al. 1976) have shown that organizational change should initially go through an unlearning phase. The elimination of old, obsolete organizational knowledge-that is, unlearning-makes room for the development of new adaptive capacities (Hedberg, 1981; Nystrom and Starbuck, 1984; Hedberg et al. 1976; Markoczy, 1994; Starbuck, 1989). This paper reviews the different conceptualizations of the unlearning process in the research literature. The integration of these various perspectives allows inferring that organizational unlearning is mainly apprehended as a tool for the removal of ineffcient behavior in favor of an adaptive one. A subsequent analysis of the intimate bonds between organizational knowledge and actions (Pfeffer and Sutton, 1999; Kuwada, 1998; Klein, 1989) shows that other knowledge manipulation processes may have the same behavioral effect. Two new processes are proposed. Knowledge inactivation and rivaling enforced enactment eliminate undesired behaviors by altering the perceived validity and, respectively, the operational capacity of underlying organizational knowledge. All together, unlearning, rivaling enactment, and knowledge inactivation are labeled as knowledge neutralization phenomena. The article concludes over the place of the newly proposed class of processes in a change context. It is argued that, although the neutralization of old knowledge is not imperative for learning, its behavioral effects provide support for organizational change. Furthermore, knowledge inactivation, rivaling enactment, and unlearning seem to fit in specific organizational settings, according to the time and resources available. An analysis of management literature uncovers latent evidence for these findings (Lorsch, 1986; Starbuck and Laudon, 1996; Carmona and Grönlund, 1998). [ABSTRACT FROM AUTHOR]
- Published
- 2007
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218. The Practice Gap.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., Simard, Caroline, and Rice, Ronald E.
- Abstract
Based on a review of selected literature, this chapter identifies and explains three categories of potential barriers to the intra-organizational transfer of best practices. The first category is the organizational context, including institutional and organizational environment, absorptive capacity, competency traps, identity, culture, and size. The second category is related to the diffusion process itself: stages of diffusion, attributes of the innovation, the recipient, and the knowledge to be transferred, and the state of relationship between the source of knowledge and the receiving unit. The third category includes management-related barriers, such as the level of managerial commitment and the appropriateness of training and reward systems. Common strategies for facilitating best practice transfer are reviewed and research propositions are derived. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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219. Trust and Knowledge Sharing in Organizations.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Mohr, Stewart
- Abstract
This paper explores elements of a favorable environment or climate for knowledge Management (KM) based primarily on collaboration and trust. It focuses on knowledge sharing aspects of knowledge management practices, and it demonstrates why there must be a climate of trust before organizational activity can support knowledge sharing. Trust is explored from the standpoint of ethical practices and the desire to create a learning organization. Evidence from the qualitative data resulting from a study of knowledge management in large organizations in New Jersey is used to support the arguments made in the first part of the paper. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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220. An Activity Centered Framework for Knowledge Management.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Gourlay, Stephen
- Abstract
Knowledge management theory and practice is dominated by two over-arching concepts: tacit and explicit knowledge. It is argued in this chapter that tacit knowledge is poorly conceptualized, and applied to disparate phenomena. Other disciplines testifying to action without awareness manage without invoking tacit knowledge, a course of action advocated here. Explicit knowledge is typically treated as unproblematic, an assumption challenged here by exploration of some issues in knowledge transfer, and with reference to reading research. Knowledge itself is admittedly a difficult concept, but it is argued that in all this we are in effect concerned with two types of activity: routine activity on the one hand, and reflective activity on the other. The chief characteristics of each are indicated, and a framework showing their inter-relations is outlined that helps draw together important aspects of knowledge management's concerns. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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221. Conversations for reflection.
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Owen, J. Mackenzie, Bates, M., Bruza, P., Capurro, R., Davenport, E., Day, R., Hedstrom, M., Paci, A.M., Tenopir, C., Thelwall, M., McInerney, Claire R., Day, Ronald E., and Aakhus, Mark
- Abstract
The challenge of augmenting transitions and transformations through technological design is addressed here by putting forward a model of Conversations for Reflection. This model helps deal with the practical problem of helping people develop their professional expertise. The model specifies procedural conditions that support the complex communicative activity of publicly testing private assumptions, surfacing dilemmas, and publicly discussing sensitive issues. This is illustrated by showing how the model informs two interventions that augment the development of expertise. The model follows from the theory of reflective practice, current understanding of accounting behavior in interaction, and the insights and recent developments in theory and research on the Language Action Perspective. The model, its rationale, and use illustrate an approach to understanding knowledge as a process. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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222. Understanding Individual Experiences of Chronic Illness with Semantic Space Models of Electronic Discussions.
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Guocai Chen, Warren, J., McArthur, R., Bruza, P., Kralik, D., and Price, K.
- Published
- 2007
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223. Inferring query models by computing information flow
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Bruza, P. D., primary and Song, D., additional
- Published
- 2002
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224. Text Based Knowledge Discovery with Information Flow Analysis.
- Author
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Xiaofang Zhou, Jianzhong Li, Heng Tao Shen, Kitsuregawa, Masaru, Yanchun Zhang, Dawei Song, and Bruza, Peter
- Abstract
Information explosion has led to diminishing awareness: disciplines are becoming increasingly specialized; individuals and groups are becoming ever more insular. This paper considers how awareness can be enhanced via text-based knowledge discovery. Knowledge representation is motivated from a socio-cognitive perspective. Concepts are represented as vectors in a high dimensional semantic space automatically derived from a text corpus. Information flow computation between vectors is proposed as a means of discovering implicit associations between concepts. The potential of information flow analysis in text based knowledge discovery has been demonstrated by two case studies: literature-based scientific discovery by attempting to simulate Swanson's Raynaud-fish oil discovery in medical texts; and automatic category derivation from document titles. There is some justification to believe that the techniques create awareness of new knowledge. [ABSTRACT FROM AUTHOR]
- Published
- 2006
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225. A Bare Bones Approach to Literature-Based Discovery: An Analysis of the Raynaud's/Fish-Oil and Migraine-Magnesium Discoveries in Semantic Space.
- Author
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Hoffmann, Achim, Motoda, Hiroshi, Scheffer, Tobias, Cole, R. J., and Bruza, P. D.
- Abstract
Literature discovery can be characterized as a goal directed search for previously unknown implicit knowledge captured within a collection of scientific articles. Swanson's serendipitous discovery of a treatment for Raynaud's disease by dietary fish-oil while browsing Medline, an online collection of biomedical literature, exemplifies such a discovery. By means of a series of experiments, the impact of stop words, various weighting schemes, discovery mechanisms, and contextual reduction are studied in relation to replicating the Raynaud/fish-oil and migraine-magnesium discoveries by operational means. Two aspects of discovery were brought under focus: (i) the discovery of intermediate, or B -terms, and (ii) the discovery of indirect A - C connections via the B-terms. A semantic space representation of the underlying corpus is computed and discoveries automated by computing associations between words in both higher and contextually reduced spaces. It was found that the discovery of B-terms and A - C connections can be achieved to an encouraging degree with a standard stop word list. In addition, no single weighting scheme seems to suffice. Log-likelihood appears to be potentially effective for leading to the discovery of B-terms, whereas both odds ratio and simple co-occurrence frequencies both facilitate the discovery of A - C connections. With regard to discovery mechanism, both semantic similarity (via cosine) and information flow computation seem promising for computing A - C connections, but more research is needed to understand their relative strengths and weaknesses. Discovery in a contextually reduced semantic space revealed mixed results. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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226. Information Flow Analysis with Chinese Text.
- Author
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Keh-Yih Su, Tsujii, Jun'ichi, Jong-Hyeok Lee, Oi Yee Kwong, Paulo Cheong, Dawei Song, Bruza, Peter, and Kam-Fai Wong
- Abstract
This article investigates the effectiveness of an information inference mechanism on Chinese text. The information inference derives implicit associations via computation of information flow on a high dimensional conceptual space, which is approximated by a cognitively motivated lexical semantic space model, namely Hyperspace Analogue to Language (HAL). A dictionary-based Chinese word segmentation system was used to segment words. To evaluate the Chinese-based information flow model, it is applied to query expansion, in which a set of test queries are expanded automatically via information flow computations and documents are retrieved. Standard recall-precision measures are used to measure performance. Experimental results for TREC-5 Chinese queries and People Daily's corpus suggest that the Chinese information flow model significantly increases average precision, though the increase is not as high as those achieved using English corpus. Nevertheless, there is justification to believe that the HAL-based information flow model, and in turn our psychologistic stance on the next generation of information processing systems, have a promising degree of language independence. [ABSTRACT FROM AUTHOR]
- Published
- 2005
227. Back to the future: a logical framework for temporal information representation and inferencing from financial news.
- Author
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Zi Huang, Kam-Fai Wong, Wenjie Li, Song, D., and Bruza, P.
- Published
- 2003
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228. Investigating aboutness axioms using information fields
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Croft, W. Bruce, van Rijsbergen, C. J., Bruza, P. D., Huibers, T. W.C., Croft, W. Bruce, van Rijsbergen, C. J., Bruza, P. D., and Huibers, T. W.C.
- Abstract
This article proposes a framework, a so called information field, which allows information retrieval mechanisms to be compared inductively instead of experimentally. Such a comparison occurs as follows: Both retrieval mechanisms are first mapped to an associated information field. Within the field, the axioms that drive the retrieval process can be filtered out. Tn this way, the implicit assumptions governing an information retrieval mechanism can be brought to light. The retrieval mechanisms can then be compared according to which axioms they are governed by. Using this method it is shown that Boolean retrieval is more powerful than a strict form of coordinate retrieval. The salient point is not this result in itself, but how the result was achieved.
- Published
- 1994
229. Index expression belief networks for information disclosure
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Bruza, P. D., van der Gaag, L. C., Bruza, P. D., and van der Gaag, L. C.
- Abstract
It is widely accepted that to extend the effectiveness of information disclosure beyond the limitations of current empirically-based retrieval systems, some notion of document semantics has to be incorporated into the retrieval mechanism. A recent approach to bringing semantics into play is to found the retrieval mechanism on the notion of logical inference. In this paper, we build on this approach and describe a promising new mechanism for information disclosure, called the Refinement Machine. The Refinement Machine features the language of index expressions as a language for characterizing information objects and a deduction mechanism driven by rules of inference. Two types of inference rule are distinguished. The rules of strict inference follow the line of traditional logical deduction. As the characterizations of objects are incomplete and requests are typically partial descriptions of the information need, the rules of strict inference are supplemented with a rule of plausible inference. This rule of plausible inference is motivated by recent work in the area of plausible reasoning in knowledge-based systems and, in particular, is derived from the work on belief networks. Besides giving details of the Refinement Machine, this paper also presents some preliminary experimental results.
- Published
- 1994
230. Efficient context-sensitive plausible inference for information disclosure
- Author
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Korfhage, Robert, Rasmussen, Edie, Willett, Peter, Bruza, P. D., van der Gaag, L. C., Korfhage, Robert, Rasmussen, Edie, Willett, Peter, Bruza, P. D., and van der Gaag, L. C.
- Abstract
Plausible inference is an essential aspect of logic-based information disclosure. This paper proposes a context-sensitive plausible inference mechanism based on a so-called index expression belief network. Plausible inference is cloaked as probabilistic evidence propagation within this network. Preliminary experiments show general evidence propagation algorithms to be too inefficient for real-life information disclosure applications. The paper sketches two optimizations whereby efficient, special-purpose evidence propagation may be realized.
- Published
- 1993
231. The Modelling and Retrieval of Documents Using Index Expressions
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Bruza, P. D., van der Weide, T. P., Bruza, P. D., and van der Weide, T. P.
- Abstract
In this paper we introduce Index Expressions as a means for modelling document content. From an index expression the the Power Index Expression can be derived, which is a powerful instrument for information retrieval. We describe the characterization of documents in the style of formal logic. The content of a document is then modelled by a set of axioms, of which the document is a model. Relating a document to a query is done by proving the query from the axioms of that document. We introduce three rules of inference. If such a proof is not possible, the relevance of the document for the query is derived by plausible deduction. We introduce two inference rules for plausible deduction.
- Published
- 1991
232. Assessing the Quality of Hypertext Views
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Bruza, P. D., van der Weide, Th P., Bruza, P. D., and van der Weide, Th P.
- Abstract
In this article the problem of assessing the quality of hypertext views is considered. This is done in terms of a formal model of hypertext in which the view is a central aspect. The objects in a view are described in terms of so called index expressions which are a powerful object characterization mechanism. These characterizations are manipulated by a calculus, which allows quantification of notions such as cohesion and relevance. These latter are useful criteria for judging the quality of a view.
- Published
- 1990
233. Protoporphyrin IX delayed fluorescence imaging: a modality for wide range surgical guidance
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Gioux, Sylvain, Gibbs, Summer L., Pogue, Brian W., Petusseau, Arthur, Bruza, Petr, and Pogue, Brian
- Published
- 2023
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234. Efficient context-sensitive plausible inference for information disclosure
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Bruza, P. D., primary and van der Gaag, L. C., additional
- Published
- 1993
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235. Stratified Hypermedia Structures for Information Disclosure
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Bruza, P. D., primary and van der Weide, T. P., additional
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- 1992
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236. Quantum-like non-separability of concept combinations, emergent associates and abduction.
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Bruza, P. D., Kitto, K., Ramm, B., Sitbon, L., Song, D., and Blomberg, S.
- Subjects
ABDUCTION (Logic) ,REASONING ,COGNITIVE science ,COGNITION ,JUDGMENT (Logic) - Abstract
Consider the concept combination ‘pet human’. In word association experiments, human subjects produce the associate ‘slave’ in relation to this combination. The striking aspect of this associate is that it is not produced as an associate of ‘pet’, or ‘human’ in isolation. In other words, the associate ‘slave’ seems to be emergent. Such emergent associations sometimes have a creative character and cognitive science is largely silent about how we produce them. Departing from a dimensional model of human conceptual space, this article will explore concept combinations, and will argue that emergent associations are a result of abductive reasoning within conceptual space, that is, below the symbolic level of cognition. A tensor-based approach is used to model concept combinations allowing such combinations to be formalized as interacting quantum systems. Free association norm data is used to motivate the underlying basis of the conceptual space. It is shown by analogy how some concept combinations may behave like quantum-entangled (non-separable) particles. Two methods of analysis were presented for empirically validating the presence of non-separable concept combinations in human cognition. One method is based on quantum theory and another based on comparing a joint (true theoretic) probability distribution with another distribution based on a separability assumption using a chi-square goodness-of-fit test. Although these methods were inconclusive in relation to an empirical study of bi-ambiguous concept combinations, avenues for further refinement of these methods are identified. [ABSTRACT FROM PUBLISHER]
- Published
- 2012
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237. The modelling and retrieval of documents using index expressions
- Author
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Bruza, P. D., primary and van der Weide, T. P., additional
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- 1991
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238. Massive MIMO and NOMA bits-per-antenna efficiency under power allocation policies.
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Alves, Thiago A. Bruza and Abrão, Taufik
- Subjects
RESOURCE allocation ,ANTENNAS (Electronics) - Abstract
A comparative resource allocation analysis in terms of received bits-per-antenna spectral efficiency (SE) and energy efficiency (EE) in downlink (DL) single-cell massive multiple-input multiple-output (mMIMO) and non-orthogonal multiple access (NOMA) systems considering a BS equipped with many (M) antennas, while K devices operate with a single-antenna, and the loading of devices ρ = K M ranging in 0 < ρ ≤ 2 is carried out under three different (PA) strategies: the inverse of the channel power allocation (PICPA), a modified water-filling (Δ -WF) allocation method, and the equal power allocation (EPA) reference method. Since in the NOMA system, the two devices per cluster are overlapped in the power-domain, the channel matrix requires transformation to perform the zero-forcing (ZF) precoding as adopted in mMIMO. Hence, NOMA operating under many antennas can favor a group of devices with higher array gain, overcoming the mMIMO and operating conveniently in the higher loading range 0. 6 < ρ < 2. 0. In such scenario, a more realistic and useful metric consists in evaluating the area under SE and EE curves, by measuring the bit-per-antenna and bit-per-antenna-per-watt efficiency, respectively. Our numerical results confirm a superiority of NOMA w.r.t. mMIMO of an order of 3x for the SE-area and 2x for the EE-area metric. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
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239. Assessing the quality of hypertext views
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Bruza, P. D., primary and van der Weide, Th. P., additional
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- 1990
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240. Book review: Language and Representation in Information Retrieval by D.C. Blair. Elsevier Science Publishers 1990
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Bruza, P. D., primary
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- 1990
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241. An evaluation of confidence in nutrition education in PA programs in the United States
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Taylor, Amanda, Bestle, Bailey, Sadej, Nicole, Santoro, Benjamin, Waleck, Sarah, and Bruza-Augatis, Mirela
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- 2022
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242. PA educational outreach to underserved urban communities
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Bruza-Augatis, Mirela, Rodriguez, Vanessa, and Burns, Jason
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- 2022
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243. Single-photon avalanche diode imaging sensor for subsurface fluorescence LiDAR
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Bruza, Petr, Petusseau, Arthur, Ulku, Arin, Gunn, Jason, Streeter, Samuel, Samkoe, Kimberley, Bruschini, Claudio, Charbon, Edoardo, and Pogue, Brian
- Abstract
We realized subsurface fluorescence LiDAR with a large format single-photon avalanche diode array capable of localizing and quantifying concentration of fluorescent molecules in heavily scattering media, such as tissue, with submillimeter depth accuracy.
- Published
- 2021
244. AAAI 2007 Spring Symposium Series Reports
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Barkowsky, Thomas, Bruza, Peter, Dodds, Zachary, Etzioni, Oren, Ferguson, George, Gmytrasiewicz, Piotr, Hommel, Bernhard, Kuipers, Benjamin, Miller, Rob, Morgenstern, Leora, Parsons, Simon, Schultheis, Holger, Tapus, Adriana, and Yorke‐Smith, Neil
- Abstract
The 2007 Spring Symposium Series was held Monday through Wednesday, March 26‐28, 2007, at Stanford University, California. The titles of the nine symposia in this symposium series were (1) Control Mechanisms for Spatial Knowledge Processing in Cognitive/Intelligent Systems, (2) Game Theoretic and Decision Theoretic Agents, (3) Intentions in Intelligent Systems, (4) Interaction Challenges for Artificial Assistants, (5) Logical Formalizations of Commonsense Reasoning, (6) Machine Reading, (7) Multidisciplinary Collaboration for Socially Assistive Robotics, (8) Quantum Interaction, and (9) Robots and Robot Venues: Resources for AI Education.
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- 2007
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245. Maxi-Adjustment and Possibilistic Deduction for Adaptive Information Agents
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Lau, Raymond, ter Hofstede, Arthur H.M., and Bruza, Peter D.
- Abstract
The expressive power of logic is believed to be able to model most of the fundamental aspects of information retrieval (IR). However, it is also understood that classical logic is ineffective for handling partiality and uncertainty in IR. Applying non-classical logics such as the AGM belief revision logic and the possibilistic logic to adaptive information retrieval is appealing since they provide a powerful and rigorous framework to model partiality and uncertainty inherent in any IR processes. The maxi-adjustment method, which is an effective computational apparatus of the AGM paradigm, is applied to develop the learning components of the adaptive information agents. Essentially, maxi-adjustment allows the partial representation K of a user's information needs N to be refined gradually based on the user's relevance feedback t. Generally speaking, learning in adaptive information agents is characterised by the AGM belief revision Kt*. On the other hand, possibilistic logic supports a gradated assessment of the uncertainty arising from matching K with the imperfect characterisation d of an information object D. Information matching in adaptive information agents is underpinned by K ƕ d, where ƕ is the possibilistic inference relation. This paper illustrates how maxi-adjustment and possibilistic deduction can be applied to develop the adaptive information agents. Their impact on the agents learning autonomy and explanatory power is also discussed.
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- 2001
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246. Quantum Theory-Inspired Search.
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Aerts, Diederik, Bruza, Peter, Hou, Yuexian, Jose, Joemon, Melucci, Massimo, Nie, Jian-Yun, and Song, Dawei
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QUANTUM theory ,SEARCH algorithms ,MULTIMEDIA communications ,INFORMATION technology ,SEARCH engines ,COMPLEXITY (Philosophy) ,QUANTUM communication ,VECTOR spaces - Abstract
Abstract: With the huge number and diversity of the users, the advertising products and services, the rapid growth of online multimedia resources, the context of information needs are even more broad and complex. Although research in search engine technology has led to various models over the past three decades, the investigation for effectively integrating the dimensions of context to deploy advanced search technology has been limited due to the lack of a unified modeling and evaluation framework. Quantum Theory (QT) has created new and unprecedented means for communicating and computing. Besides computer science, optics, electronics, physics, QT and search engine technology can be combined: interference in user interaction; entanglement in cognition; superposition in word meaning; non-classical probability in information ranking; complex vector spaces in multimedia search. This paper highlights our recent results on QT-inspired search engine technology. [Copyright &y& Elsevier]
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- 2011
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247. Antenna selection in nonorthogonal multiple access multiple‐input multiple‐output systems aided by machine learning
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Souza Junior, Wilson, Bruza Alves, Thiago A., and Abrão, Taufik
- Abstract
This work proposes a transmitter antenna selection (TAS) method for multiple‐input multiple‐out (MIMO) nonorthogonal multiple access (NOMA) that is a promising multiple access technique for the fifth generation mobile communications systems. Specifically, we propose to activate the more suitable subset of base station antennas while allocating users into appropriate NOMA clusters such that the system operates in energy efficiency mode, selecting such appropriate antenna subset indexes that maximize the sum‐rate (SR) of the NOMA‐MIMO system. Once that the TAS based on exhaustive‐search is very complex to be implemented in real communication systems, we propose an effective TAS method based on machine learning while keeping very promising performance. A convolutional neural network‐based transmitter antenna selection (CNN‐TAS) method is proposed for efficiently select antennas aiming at maximizing the system SR. Hence, extensive numerical results demonstrate that the CNN‐TAS can suitably learn the problem, performing with very high accuracy choosing properly the antenna subset that maximizes the system spectral efficiency while reducing substantially the processing time of real‐time operations. Machine learning‐aided transmission antenna selection (TAS) in multiuser NOMA‐MIMO wireless communication is proposed under the perspective of energy efficiency metric. The TAS problem can remarkably benefit from the suitable near‐optimal selection mechanisms. The proposed CNN‐based TAS procedure remarkably reduces the complexity, resulting in an efficient real‐time signal processing implementation.
- Published
- 2021
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248. The use of logic in information retrieval modelling
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LALMAS, MOUNIA and BRUZA, PETER D.
- Abstract
Information retrieval is the science concerned with the efficient and effective storage of information for the later retrieval and use by interested parties. During the last forty years, a plethora of information retrieval models and their variations have emerged. Logic-based models were launched to provide a rich and uniform representation of information and its semantics with the aim to improve information retrieval effectiveness. This approach was first advanced in 1986 by Van Rijsbergen with the so-called logical uncertainty principle. Since then, various logic-based models have been developed. This paper presents an introduction to and a survey of the use of logic for information retrieval modelling.
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- 1998
249. Benzocyclobutenes: A New Class of High Performance Polymers
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Kirchhoff, R. A., Carriere, C. J., Bruza, K. J., Rondan, N. G., and Sammler, R. L.
- Abstract
Benzocyclobutenes are a family of thermally polymerizable monomers which can be classified into two groups: 1) monomers which contain only benzocyclobutene moieties and 2) monomers which contain sites of unsaturation in addition to benzocyclobutene moieties. The monomers can be partially polymerized (B-staged) by heating to form oligomers having processing advantages for various composite fabrication techniques. The polymerization proceeds through the thermally initiated cyclobutene ring opening to yield an o-quinodimethane intermediate (calculated to be a ground state singlet). Preliminary characterization of the network structures indicates that monomers which contained multiple benzocyclobutene moieties, optionally with sites of unsaturation, were transformed into multifunctional network junctions when the thermosets were fully cured. The 3-maleimidobenzocyclobutenes thermally polymerize to yield substantially linear, high glass transition temperature (Tg) polymers. Thus benzocyclobutene polymers encompass materials which have properties ranging from high Tg, thermosets to those of substantially linear thermoplastics. Some polymers exhibit an excellent retention of their room temperature mechanical properties to at least 200-250°C, making them useful as high performance polymers for applications in the aerospace industry. Other polymers have outstanding electrical properties including very low dielectric constant and water pickup, making them useful in electronic applications.
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- 1991
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250. Quantification of Local-Regional Deformation Based on Cherenkov Imaged Vasculature for Breast Radiotherapy Patients.
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Chen, Y., Decker, S.M., Bruza, P., Jarvis, L.A., Gladstone, D.J., Pogue, B.W., Samkoe, K.S., and Zhang, R.
- Subjects
- *
PATIENT positioning , *BIOMARKERS , *CANCER radiotherapy , *BREAST cancer , *BLOOD vessels - Abstract
Variations in patient positioning can profoundly influence treatment outcomes, so accurate positioning is crucial for precise radiotherapy dose delivery. This study introduces a novel application of Cherenkov imaging and hypothesizes that it allows for the precise quantification of local-regional tissue deformations to improve the accuracy of patient positioning in breast cancer radiotherapy. For the first time, local-regional deformation is quantified based on Cherenkov imaged vasculature, opening a new avenue to improve the precision of patient positioning. Optical attenuation by blood provides sufficient contrast between vasculature and surrounding tissues. After segmenting blood vessels within Cherenkov images as patient-specific biological fiducial markers, a rigid and non-rigid combined registration was deployed to quantify both inter- and intra-fraction positioning accuracy. The submillimeter accuracy was validated by imaging an anthropomorphic chest phantom with similar human vasculature during a simulated breast radiotherapy treatment, whereas the inter- and intra-fraction variations were simulated by couch shifts and respiratory motion. For 10 patients, 2D maps of local-regional tissue deformations based on non-rigid registration followed by a global shift based on a rigid registration has been quantified in the treatment region for the first time. The accuracy was validated to be within 0.83 ± 0.49 mm for the simulated inter- and intra-fraction variations. A paired t-test revealed no significant difference between the simulated and quantified variations. (P value = 0.2883 > 0.05). A retrospective Cherenkov imaging dataset including 10 breast cancer patients was analyzed for patient positioning variations within their treatment course, revealing an inter-fraction setup uncertainty of 3.71 ± 2.36 mm. Quantitative 2D deformation maps per fraction indicated local-regional deformation in addition to conventional global shifts. Much fewer deformations of 0.0487 ± 0.0385 mm quantified by the non-rigid registration performed after the rigid registration was observed compared to the rigid shift of 3.66 ± 2.35 mm in a paired t-test (P value < 0.0001), which indicates rigid registration captured the majority of global variations, with non-rigid registration addressing the residual local deformations. This study reports the first directly observed local-regional deformation and a method to precisely quantify the global and local variations in patient positioning based on rigid and non-rigid registrations using Cherenkov imaged vasculature. This novel approach demonstrates the feasibility of providing real-time quantitative imaging guidance to inform inter- and intra-fraction positioning, enhancing the precision of breast cancer radiotherapy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
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