Electric-field induced strain in biological tissues.
This paper reports a new effect whereby a physiological-level direct-current electrical field (at 1.4 V/cm) can induce time-varying mechanical strain in various types of biological tissues and gel phantoms. This effect cannot be explained by the piezoelectric effect, tissue contraction, temperature changes, and electrorestriction. The induced strain in tissues was analyzed by processing ultrasound echo signals. The sample expanded perpendicularly to the applied electric field. The expansion rate depended on the history of the applied electric field. The speed of sound changed little compared with the expansion. The new effect might be related to electrokinetic effects.
Department of Physics, Ryerson University, Toronto, Ontario M5B2K3, Canada. odoganay@ryerson.ca
Ozkan
O
Doganay
Yuan
Y
Xu
D000273:Adipose Tissue / Q000000981:diagnostic imaging / Q000502:physiology / Q000528:radiation effects; D000818:Animals; D004574:Electromagnetic Fields; D005780:Gelatin; D006321:Heart / Q000502:physiology / Q000528:radiation effects*; D066298:In Vitro Techniques; D007668:Kidney / Q000000981:diagnostic imaging / Q000502:physiology / Q000528:radiation effects; D008099:Liver / Q000000981:diagnostic imaging / Q000502:physiology / Q000528:radiation effects; D008954:Models, Biological; D019047:Phantoms, Imaging; D012879:Skin Physiological Phenomena / Q000528:radiation effects; D013314:Stress, Mechanical; D013552:Swine; D014465:Ultrasonics; D014463:Ultrasonography
D005780:Gelatin