Finite-element analysis of material and parameter effects in laser-based thermoelastic ultrasound generation.
Laser-based, thermoelastic transduction methods have potential in very high frequency (>50 MHz), high-density two-dimensional (2-D) arrays for a variety of very high-resolution superficial imaging applications, including in vivo tissue sectioning. Previous studies of these transducers generally have been based on experimental measurements or theoretical analyses using various simplifying assumptions. These theoretical models are mostly 1-D and best matched to simple geometries with a minimum number of component materials. In this work, we use a new thermoelastic solver in a commercially available finite-element analysis (FEA) software package to analyze multidimensional effects in laser-based devices of arbitrary geometry with the potential for use with arbitrary material properties. The FEA approach was verified first against experimental data. Thereafter, we explored the impact of various design variables, including laser spot size and laser penetration depth.
University of Virginia, Department of Biomedical Engineering, Charlottesville, VA 22908-0759, USA.
Shiwei
S
Zhou
Paul
P
Reynolds
Roland
R
Krause
Takashi
T
Buma
Matthew
M
O'Donnell
John A
JA
Hossack
D019412:Anatomy, Cross-Sectional / Q000295:instrumentation / Q000379:methods*; D003198:Computer Simulation; D004548:Elasticity; D020342:Finite Element Analysis; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007834:Lasers; D008422:Materials Testing / Q000379:methods; D008954:Models, Biological; D019047:Phantoms, Imaging; D013817:Thermography / Q000295:instrumentation / Q000379:methods*; D014465:Ultrasonics; D014463:Ultrasonography / Q000295:instrumentation / Q000379:methods*