archive-edu.com » EDU » O » OSC.EDU

Total: 329

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • Wheelchair User Proficiency Through Virtual Simulation
    users it provides more appropriate device fitting and training with wheelchair control systems and for health care professionals it provides a system for assessing user performance and for determining the best power chair control mechanism for a particular patient Click on image for movie The system consists of an instrumented joystick driven power wheelchair connected to a high performance graphics workstation Silicon Graphics CRIMSON VGXT it simulates the actual speed and maneuverability of the particular wheelchair within a virtual structure The display generates realistic interiors containing multiple light sources and surface textures and is viewed in stereo through lightweight polarized glasses The system maintains a hierarchical data structure that detects collisions between the virtual wheelchair and the environment Figure 1 10 vectors used to calculate chair collisions In 1995 collateral funding was obtained through the United States Air Force SBIR program In collaboration with Immersion Human Interface Corporation of San Jose California the project Commercially Viable Force Feedback Controller for Individuals with Neuromotor Disabilities investigates the use and efficacy of force feedback technologies for assisting disabled individuals in controlling a power chair in a virtual environment Two primary modes of operation were supported for the joystick passive and active In passive mode the joystick will discourage the driver from going toward obstacles by making it harder to push the joystick in those directions For example if the user is moving down a narrow hallway the joystick will allow travel only forward or backward and will restrict the driver from steering close to a wall Active mode allows the joystick to exert a force that will guide the user toward a less congested area Thus as a user drives toward an obstacle the joystick will provide a moderate force to actually guide the users s hand to move the joystick and steer the chair away from the obstruction We see this research providing assistive technologies to individuals with specific disabilities such as spastic hand movements and dim vision Figure 2 Plan view of virtual environment and steering tasks Pilot trials were run at OSC Subjects included individuals with disabilities of varying severity and individuals from the non disabled population Simple steering tasks were performed and evaluated Individuals were asked to navigate through a simple environment using a joystick controller The hypothesis is that force feedback technologies can provide significant improvements in user performance Click on any image for movie Progress To date we have developed a robust system that provides previsualization of architectural data sets and assists in assessment for ADA compliance In addition the system provides an immersive environment for users to train themselves in the use of a power chair therefore limiting the application of unsuitable technology that may never be fully or even partially utilized Current efforts include the completion of a communications protocol to allow a health care provider working on a remote machine to place moving objects into the path of the user Currently the system tracks and records specific tasks performance time and number and

    Original URL path: http://archive.osc.edu/research/Biomed/projects/wheelchair/index.shtml (2013-06-13)
    Open archived version from archive


  • Visualization of the Heart Through 3-D Reconstruction
    were used in data acquisition For each subject two data sets were acquired The first data set was obtained using a spin echo protocol by which the flow provides a low signal and appears dark in the image The second data set was acquired with a gradient echo protocol by which the flow provides a high signal and appears light in the image Spin Echo Imaging Subject 1 Study 1 In this spin echo dark flow acquisition the ability to segment the volumes of the heart s chambers from the endocardium is greatly facilitated This is also true for the great vessels such as the ascending aorta However the external surface of the myocardium is difficult to discritize Subsequently stepping can be seen in the surface of the heart For TE 25ms slow flowing blood is dark This technique improves the contrast between the inner heart chambers The TR RR 800ms thus the heart signal is lower and thus the contrast between the heart and the lung is lower Subject 2 Study 1 In this spin echo dark flow acquisition it was easier to segment surface anatomy of the heart as well as the lumens of the great vessels and chambers of the heart Compared to Subject 1 Study 1 the intensity gradient between the epicardium and the surrounding tissue was greater and facilitated segmentation This gradient was less as the greater vessels were imaged superiorly Additional images provided a data set of the entire heart from apex to base including some the great vessels Overall this acquisition was superior in facilitating segmentation and providing high quality surface anatomy For TE 5ms only very fast moving blood is black For TR 2RR 2000ms heart muscle provides a higher signal thus the heart lung contrast is better Gradient Echo Imaging Example

    Original URL path: http://archive.osc.edu/research/Biomed/projects/vhr/index.shtml (2013-06-13)
    Open archived version from archive

  • Virtual Simulation of Regional Anesthesia
    the needle passing through the various tissues the anesthesiologist must maneuver the tip of the needle into the correct space without perforating and damaging the spinal cord in the process Limitations of physical models such as mannequins include lack of patient variance inaccurate representation of biological tissue and physical wear from repeated use The use of cadaveric material offers limited opportunities and associated risks The best method of training residents on this delicate and dangerous manual task remains the use of live patients a scenario obviously not optimal for patients In addition teaching this technique requires highly intensive tutorial interaction with faculty due to the significant learning curve in understanding exact placement of the needle This ongoing collaborative effort between researchers at The Ohio State University Hospitals Immersion Corporation and OSC is to create and test a virtual simulator for training residents in the use of regional anesthesiology Under funding from the Department of Defense we are creating a system for teaching a specific method of regional anesthesia the epidural technique Our methods include the application and integration of virtual technologies Our system components include a high performance graphics workstation capable of stereo display a real time volume renderer a voice activated interface and a one dimensional haptic probe capable of simulating the resistive forces of penetrated tissues mpeg file 110260 bytes The system will enable the resident to investigate various three dimensional reconstructed data sets in a nonthreatening environment The system can be cued through voice activation to provide additional information in text audio or graphical form Furthermore the system incorporates the necessary components to allow the resident to feel the technique as performed by the expert By providing a new form of procedural training in a nonthreatening environment the simulator will increase the proficiency level of the resident

    Original URL path: http://archive.osc.edu/research/Biomed/projects/anesthesia/index.shtml (2013-06-13)
    Open archived version from archive

  • Visualization of Skull Base and Cranial Tumors
    to treat surgically some surgeons in fact consider lesions in this area inoperable Proximity to vital structures such as cranial nerves the eye and inner ear major vascular structures to the brain and the brain itself makes operating on this region extremely challenging even for the experts In the past injury to nearby vital structures led to unacceptable operative morbidity Surgical mortality resulting from hemmorhage and sepsis was overwhelming Only within the recent past has surgical treatment of lesions in this area become a reasonable alternative Merged CT and MRI Datasets The safest and most appropriate surgical approach to lesions of the anterior and lateral skull base can be devised only with accurate and precise pre operative assessment The normal anatomy is complex and relationships are often pathologically altered or changed by prior surgery A surgeon commonly finds anatomical relationships that were not anticipated before surgical exposure Even current diagnostic capabilities such as magnetic resonance and high resolution thin section computed tomography do not reveal relationships as extensively as surgical exposure The precision still does not enable the surgeon to rely solely on information derived from imaging studies Interoperative clinical assessment is essential An interdisciplinary team of skull base and cranial surgeons radiologists and research and computer scientists are developing an interactive system for real time manipulation of volumetric reconstructions from imaging studies combining both computed tomography and magnetic resonance including magnetic resonance angiography This work includes developing a volume rendering system capable of real time rendering of moderate 256 3 to high resolution 300 3 500 3 volume data sets The renderer can integrate volumetric and polygonal data so an image of a gloved hand and medical instruments can be seen with volumetric medical data The system incorporates new techniques in volume deformation and rendering to ultimately drive haptic

    Original URL path: http://archive.osc.edu/research/Biomed/projects/tumors/index.shtml (2013-06-13)
    Open archived version from archive

  • Haptic Interface for Virtual Exploration of Computational Data
    Research Report Biomedical Sciences and Visualization Haptic Interface for Virtual Exploration of Computational Data Overview Endoscopic Sinus Surgery ESS has gained popularity among otolaryngologists as the treatment of choice for recurrent acute and chronic sinusitis These techniques require a high level of skill to be performed adequately and without morbidity ESS requires a thorough understanding of the three dimensional anatomy of the paranasal sinuses to avoid the associated risks of working within millimeters of the brain orbital contents and associated vascular structures These techniques are learned primarily in a hands on fashion within the operating room or through cadaver dissection after the anatomy has been mastered from textbooks The associated risks of novice surgeons doing ESS on real patients is self evident Cadaver specimens offer a nonthreatening environment in which to practice but the supply of such material is often limited and tissue realism is lacking in both appearance and texture The above factors make the development of a surgical simulator for ESS using high performance computing a useful and necessary goal In collaboration with Immersion Corporation the Ohio Supercomputer Center is developing an Endoscopic Sinus Surgery Simulator The patient model will be reconstructed from merged high resolution computed tomography and magnetic resonance images and will be available for use on a high performance graphics workstation The simulation will consist of a physical model of the patient s head An endoscope will be available in the nares of the model The user will insert the forceps and suction device through the nares The instruments will engage the haptic feedback hardware housed inside the model of the head Initial versions will employ 3 degrees of freedom to the instrumentation Initially the display will appear on a separate monitor a technique commonly used in ESS Later versions will employ micromonitors combined with

    Original URL path: http://archive.osc.edu/research/Biomed/projects/sinus/index.shtml (2013-06-13)
    Open archived version from archive

  • Biomedical Informatics Synthesis Platform
    Summer Institute HPC and Software Training Current Training and Events Educators Online OCS Lecture Series Press Releases Headlines Calendar of Events About OSC Media Kit OSC Media Contacts Staff Directory Visit OSC Supercomputing Support Networking Support Biomedical Sciences and Visualization Current Projects Past Projects Symposiums Interface Lab VTbone Site Contact Us Related Links Research at OSC Get an Account Supercomputing BALE Research Reports 2009 Research Highlights 2008 Research Report 2007 Research Report Biomedical Sciences and Visualization Biomedical Informatics Synthesis Platform Funding Source Biomedical Research and Technology Transfer BRTT Fund Principal Investigator Joel Saltz M D Ph D The Ohio State University Duration 10 1 02 9 30 05 Description This project involves the development of a computational platform that will unify bioinformatics experimental and clinical data to accelerate advances in human medicine and produce a stream of commercial products OSC s effort focuses on the integrative services that support the iterative exploratory tasks generally required in sensemaking activities such as proposed in the Biomedical Information Systems Platform BISP Our specific focus comprises the user interface interactive visualization and collaboration services that will utilize the distributed resources made available on the project Image s Figure 1 Clockwise Examples of various data

    Original URL path: http://archive.osc.edu/research/Biomed/projects/bisp/index.shtml (2013-06-13)
    Open archived version from archive

  • Ohio Research in Advanced Internet Utilization, Simulation, and Telerobotics
    Visualization Blue Collar Computing Computational Science Engineering Research Applications Networking Research Systems Research Research Report Ralph Regula School Computational Chemistry Grid Summer Institute Young Women s Summer Institute HPC and Software Training Current Training and Events Educators Online OCS Lecture Series Press Releases Headlines Calendar of Events About OSC Media Kit OSC Media Contacts Staff Directory Visit OSC Supercomputing Support Networking Support Biomedical Sciences and Visualization Current Projects Past Projects Symposiums Interface Lab VTbone Site Contact Us Related Links Research at OSC Get an Account Supercomputing BALE Research Reports 2009 Research Highlights 2008 Research Report 2007 Research Report Biomedical Sciences and Visualization State of the Art Infrastructure to Support Ohio Research in Advanced Internet Utilization Simulation and Telerobotics Funding Source Hayes Investment Fund Ohio Board of Regents Principal Investigator Robert Gilky Ph D Wright State University Duration awarded 2002 Description This equipment project is a joint effort between Wright State University the Air Force Institute of Technology The Ohio State University and OSC to investigate the sensory motor and cognitive loads in Shared Virtual Environments the computational and network performance and limitations Image s Figure 1 Lower left non invasive use of infra red imaging to determine user intent Software

    Original URL path: http://archive.osc.edu/research/Biomed/projects/hayes/index.shtml (2013-06-13)
    Open archived version from archive

  • Software Applications and Codes Meeting for the Ohio Supercomputer Center Bioscience Cluster Expansion
    a leading role in these priority research areas As a biomedical bioscience researcher we invite your participation in the meeting so that we can review the proposed expansion and understand your computational needs and requirements particularly with respect to software applications and codes that you are using or plan to use in the near future Video Stream Click here for the recorded video stream of the event Be advised You cannot have pop ups blocked for the stream to work and the most recent version of Quicktime 7 0 is not compatible with the above stream Please use either Windows Media Player 10 or Quicktime 6 5 for Apple OS X 10 3 9 If you have Apple s OS X 10 4 x Tiger and cannot reinstall Quicktime 6 5 you can use Internet Explorer with Quicktime 7 0 and hear the audio stream without the video Agenda 10 00 am Welcome and Introductions Stan Ahalt Executive Director Ashok Krishnamurthy Director of Research Ohio Supercomputer Center Ohio Bioinformatics Consortium Research Infrastructure 10 05 am Overview of Hardware Expansion Doug Johnson Sr Systems Developer Ohio Supercomputer Center 10 20 am Service Oriented Bioscience Cluster at OSC Umit Catalyurek Department of Biomedical Informatics The Ohio State University 10 30 am GRIDP and computational drug discovery Matt Wortman Computational Biology and Information Technology Genome Research Institute University of Cincinnati 10 40 am Large scale phylogenetic analysis of the evolution and spread of infectious disease Dan Janies Department of Biomedical Informatics Ohio State University Medical Center 10 50 am Remote Instrumentation Access for the Ohio Consortium for Metabonomics Aaron Goodpaster Department of Chemistry and Biochemistry Miami University 11 00 am Supporting Phenotyping through Visualization and Image Analysis Raghu Machiraju Department of Computer Science and Engineering The Ohio State University 11 10 am The

    Original URL path: http://archive.osc.edu/research/Biomed/symposium/bioscience/index.shtml (2013-06-13)
    Open archived version from archive



  •