Visually exploring worldwide incidents tracking system data

2008 ◽  
Author(s):  
Shree D. Chhatwal ◽  
Stuart J. Rose
Keyword(s):  
Tracking System ◽  
System Data

Knee Kinetics in Baseball Hitting and Return to Play After ACL Reconstruction

2020 ◽  
Author(s):  
Kevin Giordano ◽  
Meredith Chaput ◽  
Adam Anz ◽  
Jeremy Braziel ◽  
James Andrews ◽  
...  
Keyword(s):  
Acl Reconstruction ◽  
External Rotation ◽  
Tracking System ◽  
Return To Play ◽  
Knee Kinetics ◽  
System Data ◽  
Rehabilitation Exercises ◽  
Kinetics Of ◽  
Electromagnetic Tracking System ◽  
Linear Regressions

AbstractThe purpose of this study was to describe the knee kinetics of baseball hitting, develop a tool to predict knee kinetics from easily obtainable measures, and to compare knee kinetics to other exercises along the rehabilitation continuum to determine a timeline for when hitting may resume after ACL reconstruction. Nineteen high school baseball athletes (16.3±0.8 yrs, 180.6±5.7 cm, 78.4±10.8 kg) participated. Participants took ten swings off a tee. Kinetic data were recorded using an electromagnetic tracking system. Data from swings with the top three exit velocities were averaged for analysis. Linear regressions were used to determine if predictors of height, mass, age and exit velocity could predict the following torques: bilateral knee net, extension, internal and external rotation, valgus and varus torque; and anterior force. Backwards regression models revealed independent variables could significantly predict front knee net, internal and external rotation, extension, and varus torque, and anterior force; and back knee net and valgus torque. Based on the kinetics of baseball hitting compared to those of rehabilitation exercises, if the involved knee is the front, we suggest tee hitting may be initiated at 13 weeks after ACL reconstruction. If the involved knee is the back, we suggest tee hitting may initiated at 17 weeks after ACL reconstruction.

scholarly journals Improving pupil diameter measurement accuracy in a remote eye tracking system

2019 ◽  
Vol 63 (1) ◽  
pp. 49-53
Author(s):  
Joseph T Coyne ◽  
Noelle Brown ◽  
Cyrus K. Foroughi ◽  
Ciara M Sibley
Keyword(s):  
Eye Tracking ◽  
Measurement Accuracy ◽  
Pupil Diameter ◽  
Tracking System ◽  
Reference Value ◽  
Cognitive Tasks ◽  
Diameter Measurement ◽  
Average Difference ◽  
Fixed Size ◽  
System Data

Pupil diameter (PD) has been used to track changes in mental effort across a broad range of cognitive tasks for over 60 years. PD is often measured from remote eye tracking systems, which all have the same limitation: the lack of a known reference value to convert the pixels captured within the systems to millimeters. Researchers frequently normalize their data within an individual to overcome this issue, however recent studies have found individual differences in resting PDs. This paper investigated the use of a fiduciary marker of a fixed size and an individual’s interpupillary distance, as known reference values. Both techniques substantially improved the accuracy of PD data compared to the unadjusted system data. Further, the average difference between both techniques and the uncorrected pupil diameter was just under .4mm, which is approximately the equivalent of most studies finding differences in cognitive load.

scholarly journals Performance Analysis: Issues Tracking System Data through June 2012

2013 ◽  
Author(s):  
C Kerr ◽  
N Mctyer ◽  
G Holman ◽  
C De Grange
Keyword(s):  
Performance Analysis ◽  
Tracking System ◽  
System Data

scholarly journals Performance Analysis: Issues Tracking System Data through June 2013

2014 ◽  
Author(s):  
C Kerr ◽  
N McTyer ◽  
G Holman ◽  
C De Grange
Keyword(s):  
Performance Analysis ◽  
Tracking System ◽  
System Data

Technical description, phantom accuracy, and clinical feasibility for fiducial-free frameless real-time image-guided spinal radiosurgery

2006 ◽  
Vol 5 (4) ◽  
pp. 303-312 ◽  
Author(s):  
Alexander Muacevic ◽  
Michael Staehler ◽  
Christian Drexler ◽  
Berndt Wowra ◽  
Maximilian Reiser ◽  
...  
Keyword(s):  
Tracking System ◽  
Setup Time ◽  
Radicular Pain ◽  
Technical Application ◽  
Inverse Treatment Planning ◽  
Spinal Lesions ◽  
Alignment System ◽  
Cyberknife Radiosurgery ◽  
Spinal Radiosurgery ◽  
System Data

Object The authors describe the technical application of the Xsight Spine Tracking System, data pertaining to accuracy obtained during phantom testing, and the initial clinical feasibility of using this fiducial-free alignment system with the CyberKnife in spinal radiosurgery. Methods The Xsight integrates with the CyberKnife radiosurgery system to eliminate the need for implantation of radiographic markers or fiducials prior to spinal radiosurgery. It locates and tracks spinal lesions relative to spinal osseous landmarks. The authors performed 10 end-to-end tests of accuracy using an anthropomorphic head and cervical spine phantom. Xsight was also used in the treatment of 50 spinal lesions in 42 patients. Dose planning was based on 1.5-mm-thick computed tomography slices in which an inverse treatment planning technique was used. All lesions could be treated using the fiducial-free tracking procedure. Phantom tests produced an overall mean targeting error of 0.52 ± 0.22 mm. The setup time for patient alignment averaged 6 minutes (range 2–45 minutes). The treatment doses varied from 12 to 25 Gy to the median prescription isodose of 65% (40 to 70%). The tumor volume ranged between 1.3 and 152.8 cm3The mean spinal cord volume receiving greater than 8 Gy was 0.69 ± 0.35 cm3No short-term adverse events were noted during the 1- to 7-month follow-up period. Axial and radicular pain was relieved in 14 of 15 patients treated for pain. Conclusions Fiducial-free tracking is a feasible, accurate, and reliable tool for radiosurgery of the entire spine. By eliminating the need for fiducial implantation, the Xsight system offers patients noninvasive radiosurgical intervention for intra- and paraspinal tumors.

scholarly journals Using Optical Tracking System Data to Measure Team Synergic Behavior: Synchronization of Player-Ball-Goal Angles in a Football Match

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4990
Author(s):  
Daniel Carrilho ◽  
Micael Santos Couceiro ◽  
João Brito ◽  
Pedro Figueiredo ◽  
Rui J. Lopes ◽  
...  
Keyword(s):  
Interpersonal Relationships ◽  
Tracking System ◽  
Statistical Significance ◽  
Optical Tracking ◽  
Optical Tracking System ◽  
Home Team ◽  
Theoretical Support ◽  
Football Match ◽  
Cluster Phase ◽  
System Data

The ecological dynamics approach to interpersonal relationships provides theoretical support to the use of kinematic data, obtained with sensor-based systems, in which players of a team are linked mainly by information from the performance environment. Our goal was to capture the properties of synergic behavior in football, using spatiotemporal data from one match of the 2018 FIFA WORLD CUP RUSSIA, to explore the application of player-ball-goal angles in cluster phase analysis. Linear mixed effects models were used to test the statistical significance of different effects, such as: team, half(-time), role and pitch zones. Results showed that the cluster phase values (synchronization) for the home team, had a 3.812×10−2±0.536×10−2 increase with respect to the away team (X2(41)=259.8, p<0.001) and that changing the role from with ball to without ball increased synchronization by 16.715×10−2±0.283×10−2 (X2(41)=12227.0, p<0.001). The interaction between effects was also significant. The player-team relative phase, the player-ball-goal angles relative frequency and the team configurations, showed that variations of synchronization might indicate critical performance changes (ball possession changes, goals scored, etc.). This study captured the ongoing player-environment link and the properties of team synergic behavior, supporting the use of sensor-based data computations in the development of relevant indicators for tactical analysis in sports.

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