Ronald K. Walkup

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PURPOSE To automate time (and motion) studies of major trauma resuscitations. TECHNIQUES We modified an existing time-motion study technique based on time-encoded videotaping for medical imaging workstation human factors analysis. Videotapes were recorded of the trauma room during normal clinical activity using an unobtrusive mounted camera. The(More)
Digital photography of postmortem brain slices was compared with magnetic resonance imaging (MRI) for morphological analysis of human brain atrophy. In this study, we used two human brains obtained at autopsy: a cognitively defined nondemented control (70-yr-old male) and a demented Alzheimer's disease (AD) subject (82-yr-old female). For each of two(More)
OBJECTIVES To compare the results or two methods of histogram matching and two methods of histogram flattening for their ability to correct for contrast variations in digital dental images. METHODS A custom-built, aluminium stepwedge with 0.1, 0.5 and 1.0 mm steps was placed over Ektaspeed films and exposed for 0.06, 0.12 and 0.25 s, respectively.(More)
Dental radiographs are amenable to digital image processing and analysis for both subjective interpretation and quantification of scene features. Four general-purpose image processing programs for the Apple Macintosh II computer (NIH Image, Enhance, IP Lab and DIP Station) were applied to digital analysis of dental radiographs. These programs can manipulate(More)
Evaluation of coronary anatomy with conventional coronary angiography requires visual integration of multiple images from different viewing orientations to generate a mental interpretation of three-dimensional (3D) structure. The epicardial surface is, in many ways, analogous to the earth's surface topography and may be effectively depicted using(More)
The resolution requirements were determined for detection of incremental alveolar bone loss from digitized Ektaspeed radiographs. Ten clinical radiographs were examined with a calibrated optical microscope to measure the smallest feature of interest discernible for alveolar bone. Images of trabeculae > 100 microns in diameter could be identified, but(More)
Rapid prototyping is a quick, efficient way to evaluate new electrical instruments. A hardware interface between a computer and an instrument can be simulated in software. The authors demonstrate the technique of rapid prototyping by developing interfaces for two therapeutic strength-testing devices and an electromagnetic tracker/digitizer. The LabVIEW(More)
Quantitative evaluation of upper extremity impairment, a percentage rating most often determined using a rule based procedure, has been implemented on a personal computer using an artificial intelligence, rule-based expert system (AI system). In this study, the rules given in Chapter 3 of the AMA Guides to the Evaluation of Permanent Impairment (Third(More)
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