Development of a real-time spinal motion inertial measurement system for vestibular disorder application
Date
2007-08-10T21:59:21Z
Authors
Goodvin, Christina
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
The work presented in this thesis has two distinct parts: (i) development of a spinal
motion measurement technique and (ii) incorporation of the spinal motion measurement
with galvanic vestibular stimulation (GVS) technology, acting as a balance assist device
hereafter referred to as a galvanic vestibular stimulation device (GVSD). The developed
spinal motion measurement technique fulfills seven desired attributes: accuracy,
portability, real-time data capture of dynamic data, non-invasive, small device footprint,
clinically useful and of non-prohibitive cost. Applications of the proposed system range
from diagnosis of spine injury to postural and balance monitoring, on-field as well as in
the lab setting. The system is comprised of three inertial measurement sensors,
respectively attached and calibrated to the head, torso and hips, based on the subject’s
anatomical planes. Sensor output is transformed into meaningful clinical parameters of
rotation, flexion-extension and lateral bending of each body segment with respect to a
global reference space, then collected and visualized via an interactive graphical user
interface (GUI). The accuracy of the proposed sensing system has been successfully
verified with subject trials using a VICON optical motion measurement system. Next, the
proposed motion measurement system and technique has been used to record a standing
iv
subject’s motion response to GVS. The data obtained allows the development of a new
GVSD with the attributes of: eligibility for commercial licensing, portability, and capable
of safely providing controlled stimulating current to the mastoid bones at varying levels
and frequencies. The successful combination of the spinal motion measurement technique
and GVSD represents the preliminary stage of a balance prosthesis.
Description
Keywords
Inertial sensing, Vestibular prosthesis, galvanic stimulation, spinal motion, GVS, 6 DOF, spinal orientation, motion capture