Christopher Sewell

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Visual and haptic simulation of bone surgery can support and extend current surgical training techniques. The authors present a system for simulating surgeries involving bone manipulation, such as temporal bone surgery and mandibular surgery, and discuss the automatic computation of surgical performance metrics. Experimental results confirm the system's(More)
This paper presents several new metrics related to bone removal and suctioning technique in the context of a mastoidectomy simulator. The expertise with which decisions as to which regions of bone to remove and which to leave intact is evaluated by building a Naïve Bayes classifier using training data from known experts and novices. Since the bone voxel(More)
There is a need in the haptics research community for a suite of software libraries that enables the rapid development of device-independent multimodal virtual worlds. In this demo, we illustrate the features of the Computer Haptics and Active Interfaces (CHAI) libraries, an open source haptics development platform which we have developed and made freely(More)
We describe a framework for training-oriented simulation of temporal bone surgery. Bone dissection is simulated visually and haptically, using a hybrid data representation that allows smooth surfaces to be maintained for graphic rendering while volumetric data is used for haptic feedback. Novel sources of feedback are incorporated into the simulation(More)
This sketch presents the design and preliminary results of a study that investigates the transference of motor skills learned in a haptic-enabled virtual environment to performance on a surgically-relevant task in the real world. The chosen task, which requires skills similar to those needed in a number of surgical procedures, including stapedotomy and(More)
As the visualization research community reorients its software to address up-coming challenges, it must successfully deal with diverse processor architectures, distributed systems, various data sources, massive parallelism, multiple input and output devices, and interactivity. V isualization is an enabling technology—its purpose is to derive insight from(More)
This study examined the relationship between social anxiety and the neural processing of threat in faces. Twenty-one adults with different levels of society anxiety were tested for their event-related potential responses to unattended threatening and nonthreatening faces, presented upright and upside-down, at three points in time: 160-210 ms (vertex(More)
Evaluating a trainee's performance on a simulated procedure involves determining whether a specified objective was met while avoiding certain "injurious" actions that damage vulnerable structures. However, it is also important to teach the stylistic behaviors that minimize overall risk to the patient, even though these criteria may be more difficult to(More)
—This paper surveys the four software frameworks being developed as part of the visualization pillar of the SDAV (Scalable Data Management, Analysis, and Visualiza-tion) Institute, one of the SciDAC (Scientific Discovery through Advanced Computing) Institutes established by the ASCR These frameworks include EAVL (Extreme-scale Analysis and Visualization(More)