Surface deformation tracking and modeling of soft materials.
Annu Int Conf IEEE Eng Med Biol Soc
; 2015: 4411-4, 2015 Aug.
Article
in En
| MEDLINE
| ID: mdl-26737273
ABSTRACT
Characterizing the mechanical properties of skin may lead to improvements in surgical scarring, burns treatments, artificial skin science, and disease detection. We present a method of validating a phase-based crosscorrelation method of material point tracking, used to measure surface deformations in soft tissues, using a silicone gel phantom. Tracking of a high spatial-resolution speckle pattern was validated using independent fluorescent microsphere markers. A finite element mesh was deformed according to the tracked speckle pattern, and used to predict the location of the markers. Predictions of microsphere location were compared to stereo-reconstructions. Under a 2900 µm indentation, markers under rms displacements of 125 µm produced a discrepancy between prediction and reconstruction of 23 µm. The same deformation conditions were used to illustrate the use of surface tracking for identifying mechanical properties. A force-driven finite element mesh, using a Neo-Hookean constitutive model, reproduced the surface deformation with an rms error of 172 µm.
Full text:
1
Database:
MEDLINE
Main subject:
Surface Properties
Type of study:
Prognostic_studies
Language:
En
Journal:
Annu Int Conf IEEE Eng Med Biol Soc
Year:
2015
Type:
Article