Papers by Randall Summers
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To test the feasibility of and improve a computer algorithm to automatically detect colonic polyp... more To test the feasibility of and improve a computer algorithm to automatically detect colonic polyps in real human computed tomographic (CT) colonographic data sets. Twenty patients with known polyps underwent CT colonography in the supine position. CT colonographic data were processed by using a shape-based algorithm that depicts masses that protrude into the lumen. We studied nine shape criteria and three isosurface threshold settings. Results were compared with those of conventional colonoscopy performed the same day. There were 50 polyps (28 were > or =10 mm in size; 12, 5-9 mm; 10, <5 mm). The sensitivity with optimal settings for detecting polyps 10 mm or greater was 64% (18 of 28). Sensitivity improved to 71% (10 of 14) for polyps 10 mm or greater in well-distended colonic segments. Performance decreased for polyps less than 10 mm, poorly distended colonic segments, and other shape algorithms. There was a mean of six false-positive lesion sites per colon. These sites were reduced 39% to 3.5 per colon by sampling CT attenuation at the lesion site and discarding sites having attenuation less than a threshold. Automated detection of colonic polyps, especially clinically important large polyps, is feasible. Colonic distention is an important determinant of sensitivity. Further increases in sensitivity may be achieved by adding prone CT colonography.
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Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2005
Databases of medical devices were identified via complex search strategies to discover breadth an... more Databases of medical devices were identified via complex search strategies to discover breadth and depth of coverage. The databases could be categorised into three types: Product, Business and Regulation. Evaluation of the databases uncovered several issues including: lack of continuity relating to the level of information provided; and little or no evidence that evaluation criteria has been applied to the databases. Other results of the scoping study suggest that a comprehensive medical device database must address the information requirements of a diverse group of stakeholders including multiple professional disciplines as well as patients and their carers. In order to support the needs of this disparate group of users, it is essential to develop a policy to support clear pathways to validate information gathering, representation, and retrieval activities.
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Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2004
During September 2003, interviews took place to collect data to develop a technology roadmap for ... more During September 2003, interviews took place to collect data to develop a technology roadmap for rehabilitation engineering. The emerging themes were used to create the roadmap. Criteria were developed to endorse the data prior to the representation process. Added value was by the collection and representation of supporting evidence. Roadmapping 'best practice will facilitate the capture of essential data, represented in a format that is accessible, delivered in an appropriate format, to the right person at the right time.
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2006 International Conference of the IEEE Engineering in Medicine and Biology Society, 2006
Mobile healthcare provision in the home environment presents many challenges. Patients are becomi... more Mobile healthcare provision in the home environment presents many challenges. Patients are becoming more informed about the management of chronic conditions and the use of technology to support the process is rising. Issues such as system interoperability, cost, security and training all have to be addressed to ensure effective use of mobile devices within the home healthcare arena. An aging population will impact upon traditional healthcare delivery methods.
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Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286), 1998
Modeling patient flows is an important modeling issue, providing healthcare managers with informa... more Modeling patient flows is an important modeling issue, providing healthcare managers with information regarding the resourcing requirements during the planning phase of new healthcare facilities, as well as the performance evaluation of existing facilities. This paper develops a generic model of patient flows in a progressive patient-care system based on colored Petri nets. The model is developed at two different
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ABSTRACT An effort is underway at Sandia National Laboratories to develop a library of algorithms... more ABSTRACT An effort is underway at Sandia National Laboratories to develop a library of algorithms to search for potential interactions between surfaces represented by analytic and discretized topological entities. This effort is also developing algorithms to determine forces due to these interactions for transient dynamics applications. This document describes the Application Programming Interface (API) for the ACME (Algorithms for Contact in a Multiphysics Environment) library.
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46th AIAA Aerospace Sciences Meeting and Exhibit, 2008
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ALEGRA is an arbitrary Lagrangian-Eulerian finite element code that emphasizes large distortion a... more ALEGRA is an arbitrary Lagrangian-Eulerian finite element code that emphasizes large distortion and shock propagation in inviscid fluids and solids. This document describes user options for modeling resistive magnetohydrodynamic, thermal conduction, and radiation emission effects.
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Two types of intelligent measurement systems are considered: commercially produced instrumentatio... more Two types of intelligent measurement systems are considered: commercially produced instrumentation systems with intelligence incorporated as a part of the product and instrumentation systems developed in-house in which the intelligence resides in stand-alone microcomputers linked by an appropriate machine level interface. The system evaluated is an example of the latter type, but the comments are equally relevant to the former.
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International Journal of Impact Engineering, 1997
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Papers by Randall Summers