DocumentCode :
432178
Title :
High resolution ultrasound imaging of skeletal muscle dynamics and effects of fatigue
Author :
Witte, R.S. ; Dow, D.E. ; Olafsson, R. ; Shi, Y. ; O´Donnell, M.
Author_Institution :
Michigan Univ., Ann Arbor, MI, USA
Volume :
1
fYear :
2004
fDate :
23-27 Aug. 2004
Firstpage :
764
Abstract :
A real-time high-frequency ultrasound acquisition system was used to describe coordination of individual muscle fibers during an isometric contraction. Effects of contraction size and muscle fatigue on axial strain and strain rate were examined in isolated leg muscles from a rat and mouse. Strain was estimated with a phase-sensitive speckle-tracking algorithm, capable of detecting displacements less than 100 nm. The spatial distribution of axial strain was not uniform and ranged from 0.5% - 5% during twitch stimulation. Also, strain and strain rate paralleled contraction size and degree of muscle fatigue. This potentially noninvasive technique may be appropriate to assess severity of movement disorders, such as cerebral palsy, and track coordination during therapy and rehabilitation after muscle injury.
Keywords :
biomedical ultrasonics; bone; image resolution; medical image processing; neuromuscular stimulation; real-time systems; speckle; tracking; ultrasonic imaging; axial strain; cerebral palsy; contraction size; high resolution ultrasound imaging; high-frequency ultrasound acquisition; isolated leg muscles; isometric contraction; mouse; movement disorders; muscle fatigue; muscle fiber coordination; muscle injury; noninvasive technique; phase-sensitive speckle-tracking; rat; real-time ultrasound acquisition; rehabilitation; skeletal muscle dynamics; strain rate; therapy; twitch stimulation; Capacitive sensors; Fatigue; High-resolution imaging; Image resolution; Leg; Mice; Muscles; Phase estimation; Real time systems; Ultrasonic imaging;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium, 2004 IEEE
ISSN :
1051-0117
Print_ISBN :
0-7803-8412-1
Type :
conf
DOI :
10.1109/ULTSYM.2004.1417834
Filename :
1417834
Link To Document :
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