elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Prediction of finger movements using ultrasound images

Zarka, Emanuel (2011) Prediction of finger movements using ultrasound images. Master's, DLR.

[img] PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
15MB

Abstract

Ultrasound imaging as a diagnostic device is a widespread, non-invasive technique used to investigate the interior of the human body. It uses high-frequency sound waves to visualise organs as well as musculoskeletal structures. In this thesis, ultrasound images of the human forearm are used to predict nger positions. A possible application for the presented method is the control of dexterous hand prostheses or robotic hands. Local rst-order features extracted from ultrasound images, and position values gathered by a sensor glove, provide the basis for regression analysis. Preliminary experiments prove the feasibility of this approach and reveal that there is a linear relationship between image features and nger joint angles. This holds uniformly for several subjects and enables on-line computation. Specic nger movements, such as nger exion, thumb rotation and thumb adduction, can be reconstructed up to sub-degree precision. In order for the system to correctly estimate the hand posture, movements of the ultrasound transducer with respect to the skin must be kept to a minimum. An optical ow based technique is implemented to compensate the inevitable movements and prevent drift errors. Several experiments conducted with an amputee also suggest that the system is able to reconstruct the imaginary limb and therefore may be used to treat phantom limb pain.

Document Type:Thesis (Master's)
Title:Prediction of finger movements using ultrasound images
Authors:
AuthorsInstitution or Email of Authors
Zarka, EmanuelUniversity of Applied Sciences Wien
Date:2011
Number of Pages:103
Status:Unpublished
Keywords:brain-computer interfaces, prosthetics, pain, ultrasound imaging
Institution:DLR
Department:Institute of Robotics and Mechatronics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - RMC - Kognitive Intelligenz und Autonomie (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics > Robotic Systems
Deposited By: Dr. Claudio Castellini
Deposited On:01 Feb 2012 12:28
Last Modified:01 Feb 2012 12:28

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.