Document Detail

A three-dimensional ultrasonic system for posture measurement.
MedLine Citation:
PMID:  2226426     Owner:  NLM     Status:  MEDLINE    
A time-efficient, cost-effective, and accurate system has been developed for measuring static three-dimensional joint coordinates in the laboratory. This system uses a personal computer interface to determine the distance between transmitters positioned at body joints and receivers positioned near the subject by measuring the travel time of ultrasound. Distance data are then converted to spatial coordinates and joint angles. The system can determine the location of 14 joints at one time. An experiment using three distances and five orientations between a transmitter and a receiver was performed to investigate the significance of measurement errors for the new system. The results showed that the standard deviation of the distance measurement was about 0.2 cm for single orientation conditions and was about 1 cm for all conditions tested. A second experiment using 11 transmitters and four receivers was performed to investigate the significance of measurement errors when determining three-dimensional coordinates. The results showed no significant difference between actual and measured coordinates. The system was then used to study the posture of a subject's upper extremity. Eight postures representing a variety of typical reaching tasks were examined. The results showed that the system was suitable for three-dimensional posture measurement.
H Hsiao; W M Keyserling
Related Documents :
11595256 - Multi-stimulus multi-response posturography.
22811986 - Multiplexing in the primate motion pathway.
22750056 - Motion-sensitive cortex and motion semantics in american sign language.
2387356 - Influence of local sensory afference in the calibration of human balance responses.
21347246 - Effects of mean luminance changes on human contrast perception: contrast dependence, ti...
21929806 - Reduced thoracolumbar fascia shear strain in human chronic low back pain.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ergonomics     Volume:  33     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  1990 Sep 
Date Detail:
Created Date:  1990-12-27     Completed Date:  1990-12-27     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  1089-114     Citation Subset:  IM; S    
Department of Industrial and Operations Engineering, University of Michigan, Ann Arbor 48109-2117.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Evaluation Studies as Topic
Human Engineering*
Joints / ultrasonography*
Ultrasonography / economics,  instrumentation*,  standards

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  The effects of VDT data entry work on operators.
Next Document:  Physical work and strain involved in manual sorting of postal parcels.