scholarly journals Marker‐free optical stereo motion tracking for in‐bore MRI and PET‐MRI application

2020 ◽  
Vol 47 (8) ◽  
pp. 3321-3331 ◽  
Author(s):  
Andre Z. Kyme ◽  
Murat Aksoy ◽  
David L. Henry ◽  
Roland Bammer ◽  
Julian Maclaren
Keyword(s):  
Motion Tracking ◽  
Stereo Motion ◽  
Marker Free

Marker-Free Detection of Instruments in Laparoscopic Images to Control a Cameraman Robot

2010 ◽  
Author(s):  
Keyvan Amini Khoiy ◽  
Alireza Mirbagheri ◽  
Farzam Farahmand ◽  
Saeed Bagheri
Keyword(s):  
Motion Tracking ◽  
Distance Measure ◽  
Color Space ◽  
Mean Values ◽  
Percent Correct ◽  
User Control ◽  
Control Interface ◽  
Camera View ◽  
Marker Free ◽  
Free Operator

Assistant robots are widely used in laparoscopic surgery to facilitate the camera holding and manipulation task. A variety of a hands-free operator interfaces have been implemented for user control of the robots, including voice commands, foot pedals, and eye and head motion tracking systems. This paper proposes a novel user control interface, based on processing of the laparoscopic images, that enables the robot to automatically adjust the view of the laparoscopic camera without disturbing the surgeon’s concentration. An effective marker-free detection method was investigated to track the instrument position in the laparoscopic images in real time so that the robot could center the instrument tip in the camera view. Considering several available methods it was found that a color space analysis, based on the quantitative comparison of the background’s and instrument’s pixels color contexts, provides the best results. The color contexts were presented in covariance matrix and mean values and analyzed using Mahalanobis distance measure in RGB color space. Tests on laparoscopic images with controlled conditions, e.g., sufficient light and low noises, revealed 86 percent correct detection with a processing rate of 3.7 frames per second on a conventional PC. Further work is going on to improve the algorithm.

Physiologic Studies Provide New Perspectives on Early Speech Development

2010 ◽  
Vol 20 (2) ◽  
pp. 29-36
Author(s):  
Erin M. Wilson ◽  
Ignatius S. B. Nip
Keyword(s):  
Motor Control ◽  
Motor Development ◽  
Motion Tracking ◽  
Speech Development ◽  
Speech Motor Control ◽  
Therapeutic Approaches ◽  
Facial Motion ◽  
Disordered Speech ◽  
Speech Motor ◽  
Physiologic Data

Abstract Although certain speech development milestones are readily observable, the developmental course of speech motor control is largely unknown. However, recent advances in facial motion tracking systems have been used to investigate articulator movements in children and the findings from these studies are being used to further our understanding of the physiologic basis of typical and disordered speech development. Physiologic work has revealed that the emergence of speech is highly dependent on the lack of flexibility in the early oromotor system. It also has been determined that the progression of speech motor development is non-linear, a finding that has motivated researchers to investigate how variables such as oromotor control, cognition, and linguistic factors affect speech development in the form of catalysts and constraints. Physiologic data are also being used to determine if non-speech oromotor behaviors play a role in the development of speech. This improved understanding of the physiology underlying speech, as well as the factors influencing its progression, helps inform our understanding of speech motor control in children with disordered speech and provide a framework for theory-driven therapeutic approaches to treatment.

Einfluss der Bildrate auf die Strainanalyse bei zweidimensionalem Wall Motion Tracking in der fetalen Echokardiografie

2017 ◽  
Author(s):  
C Enzensberger ◽  
L Rostock ◽  
M Götte ◽  
A Wolter ◽  
J Herrmann ◽  
...  
Keyword(s):  
Motion Tracking ◽  
Wall Motion
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