scholarly journals The Magnetic Tracker with Improved Properties for the Helmet-Mounted Cueing System

2016 ◽  
Vol 8 (4) ◽  
pp. 408-422
Author(s):  
Michail Vasilievich Zhelamskij
Keyword(s):  
Magnetic Tracker

Magnetic Tracker Calibration for Improved Augmented Reality Registration

1997 ◽  
Vol 6 (5) ◽  
pp. 532-546 ◽  
Author(s):  
Mark A. Livingston ◽  
Andrei State
Keyword(s):  
Augmented Reality ◽  
Error Function ◽  
Position Error ◽  
Orientation Error ◽  
Test Volume ◽  
Future Directions ◽  
Augmented Reality System ◽  
Working Volume ◽  
Correction Table ◽  
Magnetic Tracker

We apply a look-up table technique to calibrate both position and orientation readings from a magnetic tracker for use in virtual environments within a defined working volume. In a test volume of 2.4 cubic meters, the method reduced the tracker's average position error by 79% and its average orientation error by 40%. We test the correction table against the tracker's performance outdoors (a metal-poor environment) and show that readings taken in our lab and corrected by our method exhibit less error than uncorrected readings taken outdoors. We demonstrate that such reduction in position error visibly improves registration in an augmented reality system, whereas the (lesser) reduction in orientation error does not visibly improve registration. We show that the model we used for the orientation error function was incorrect, preventing our method from achieving better correction of orientation error, We discuss future directions for correction of orientation error.

Intraoperative Magnetic Tracker Calibration Using a Magneto-Optic Hybrid Tracker for 3-D Ultrasound-Based Navigation in Laparoscopic Surgery

2008 ◽  
Vol 27 (2) ◽  
pp. 255-270 ◽  
Author(s):  
Masahiko Nakamoto ◽  
Kazuhisa Nakada ◽  
Yoshinobu Sato ◽  
Kozo Konishi ◽  
Makoto Hashizume ◽  
...  
Keyword(s):  
Laparoscopic Surgery ◽  
Magnetic Tracker ◽  
Tracker Calibration ◽  
Magneto Optic

Realtime Organ Tracking for Endoscopic Augmented Reality Visualization Using Miniature Wireless Magnetic Tracker

2008 ◽  
pp. 359-366 ◽  
Author(s):  
Masahiko Nakamoto ◽  
Osamu Ukimura ◽  
Inderbir S. Gill ◽  
Arul Mahadevan ◽  
Tsuneharu Miki ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Magnetic Tracker

Novel Endoscope Control Assessment System Using Video and Magnetic Tracking

2020 ◽  
Author(s):  
Alexandra Ferri ◽  
Saira Hussain ◽  
Eric Pauli ◽  
Randy Haluck ◽  
Barry Fell ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Full Range ◽  
Effective Means ◽  
Assessment System ◽  
The Novel ◽  
Training Performance ◽  
Magnetic Tracking ◽  
Endoscopic Control ◽  
Extensive Training ◽  
Magnetic Tracker

Abstract Colonoscopy procedures are commonly performed to diagnose and prevent colorectal cancer. These procedures require highly trained practitioners to perform complex maneuvers with an endoscope. Extensive training is necessary to become proficient. To improve assessment during endoscope training the novel endoscopic control assessment system (ECAS) is proposed. This device uses a magnetic tracker to track the end of the endoscope in manikin training. In addition, camera imaging is used to track the angle of the control knobs during the training. Experiment 1 demonstrated that the magnetic tracker could sense the full range of motion of the endoscope. Experiment 2 showed that the control knob angle could be accurately tracked through 4 positions to within 0.6° accuracy. The feasibility of the ECAS system was shown and in the future, this can be employed as an effective means of assessing endoscopic training performance.

scholarly journals Validation of a Fast and Accurate Magnetic Tracker Operating in the Environmental Field

2021 ◽  
Author(s):  
Valerio Biancalana ◽  
Roberto Cecchi ◽  
Piero Chessa ◽  
Marco Mandalà ◽  
Giuseppe Bevilacqua ◽  
...  
Keyword(s):  
High Speed ◽  
Homogeneous Field ◽  
Practical Application ◽  
Time Performance ◽  
Magnetic Source ◽  
Precision Time ◽  
Position And Orientation ◽  
Magnetic Tracker ◽  
Best Fit ◽  
The Magnetic Field

We characterize the performance of a system based on a magnetoresistor array. This instrument is developed to map the magnetic field, and to track a dipolar magnetic source in the presence of a static homogeneous field. The position and orientation of the magnetic source with respect to the sensor frame is retrieved together with the orientation of the frame with respect to the environmental field. A nonlinear best-fit procedure is used, and its precision, time performance, and reliability are analyzed. This analysis is performed in view of the practical application for which the system is designed that is an eye-tracking diagnostics and rehabilitative tool for medical purposes, which require high speed ($\ge 100$~Sa/s) and sub-millimetric spatial resolution. A throughout investigation on the results makes it possible to list several observations, suggestions, and hints, which will be useful in the design of similar setups.

Magnetic Calibration by Tetrahedral Interpolation

1999 ◽  
Author(s):  
William Briggs
Keyword(s):  
Future Development ◽  
Statistical Data ◽  
Sparse Data ◽  
Lookup Table ◽  
Magnetic Characteristics ◽  
New Techniques ◽  
Before And After ◽  
Magnetic Tracker ◽  
Positional Data

Abstract This paper presents a method for discovering a work area’s magnetic characteristics using relatively sparse data from a magnetic tracker. It then explains a method based on creating tetrahedrons to create a lookup table used in compensating for the positional data component quickly during runtime. The paper also describes initial “before” and “after” results for a noisy lab, including visuals and statistical data. Finally new techniques are discussed for further refinement and future development.

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