Results 251 to 260 of about 24,832 (283)
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Electromagnetic Tracking for Tomotherapy Systems
International Journal of Radiation Oncology*Biology*Physics, 2012Conclusions: Our method is a valuable tool that enables us to characterize exosomes and microparticles, and, unlike other available nanoparticle analysis methods, this method permits subset identification and sorting for functional studies of single particles.
J.E. McGary, J. Chen, Z. Xiong
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A Numerical Method of the Electromagnetic Force for the Electromagnetic Track Brake
Applied Mechanics and Materials, 2012The object is to propose an accurate and succinct numerical method to compute the electromagnetic force between the electromagnetic track brake and track. The model of the magnetic circuit with variable air-gap permeance is established and the electromagnetic force is obtained by using a method of magnetic flux tubes.
Sen Lin Lu +3 more
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Intraoperative visualization and assessment of electromagnetic tracking error
SPIE Proceedings, 2015Electromagnetic tracking allows for increased flexibility in designing image-guided interventions, however it is well understood that electromagnetic tracking is prone to error. Visualization and assessment of the tracking error should take place in the operating room with minimal interference with the clinical procedure.
Vinyas Harish +5 more
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An improved calibration framework for electromagnetic tracking devices
Proceedings IEEE Virtual Reality 2001, 2002Electromagnetic trackers have many favorable characteristics but are notorious for their sensitivity to magnetic field distortions resulting from metal and electronic equipment in the environment. We categorize existing tracker calibration methods and present an improved technique for reducing the static position and orientation errors that are ...
Milan Ikits +3 more
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Toward Improved Electromagnetic Tracking for Handheld Robotics
Proceedings of the 3rd International Conference on Mechatronics and Robotics Engineering, 2017We describe early efforts in design and development of an In-Loop Electromagnetic Tracker (ILEMT), designed to meet the demanding latency and resolution requirements for handheld robotic systems that perform active stabilization of hand motion during microsurgery. The objective is to surpass the best commercial electromagnetic trackers in latency while
Robert A. MacLachlan +4 more
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Validation for tremor quantification of an electromagnetic tracking device
Movement Disorders, 2001AbstractAn electromagnetic tracking system was used to record arm motion in subjects with Parkinson's disease (n = 23), essential tremor (n = 28) or without neurological disease (n = 4). Tremor magnitude was calculated by averaging the three‐dimensional displacement of individual tremor bursts.
P E, O'Suilleabhain, R B, Dewey
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Assesment of metallic distortions of an electromagnetic tracking system
SPIE Proceedings, 2006Electromagnetic tracking systems are affected by the presence of metal or more general conductive objects. In this paper results of two protocols are presented, which will access the amount of distortions caused by certain type of metals. One of the main application areas of electromagnetic tracking systems is the medical field.
Stefan R. Kirsch +2 more
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Electromagnetically tracked personalized templates for surgical navigation
International Journal of Computer Assisted Radiology and Surgery, 2017An electromagnetic (EM) surgical tracking system was developed for orthopedic navigation. The reportedly poor accuracy of point-based EM navigation was improved by using anatomical impressions, which were EM-tracked personalized templates. Lines, rather than points, were consistently used for calibration and error evaluation.Technical accuracy was ...
Andrew W. L. Dickinson +4 more
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Standardized evaluation method for electromagnetic tracking systems
SPIE Proceedings, 2005The major aim of this work was to define a protocol for evaluation of electromagnetic tracking systems (EMTS). Using this protocol we compared two commercial EMTS: the Ascension microBIRD (B) and NDI Aurora (A). To enable reproducibility and comparability of the assessments a machined base plate was designed, in which a 50 mm grid of holes is precision
Johann Hummel +6 more
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Fluoroscopy based accuracy assessment of electromagnetic tracking
SPIE Proceedings, 2006Tracking organ motion due to respiration is important to enable precise interventions in the regions of the abdomen and thorax. Respiratory induced motion in these regions may limit the accuracy of interventions which do not employ some type of tracking. One method of tracking organ motion is to use a predictive model based on external tracking that is
Ziv Yaniv, Kevin Cleary
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