Time and frequency resolved XeCl laser-induced mechanical transients in otic capsule bone
Ryan G McCaughey1, Brian J F Wong, Joseph Neev
1Beckman Laser Institute and Medical Clinic, University of California-Irvine, Irvine, California 92715, USA. mccaugh@uci.edu
Photomedicine and Laser Surgery
|February 6, 2008
Summary
Photoacoustic waves were detected during excimer laser bone ablation. Higher laser energy increases stress wave amplitude, requiring a balance for safe middle ear surgery.
Area of Science:
- Biomedical Engineering
- Laser Physics
- Otolaryngology
Background:
- Pulsed ultraviolet lasers offer precise ablation for middle ear surgery.
- Excimer lasers' short pulse widths can induce significant thermoelastic stress.
Purpose of the Study:
- To identify photoacoustic waves during excimer laser ablation of bone.
- To analyze the relationship between laser parameters and stress wave generation.
Main Methods:
- A XeCl excimer laser system was used to ablate porcine bone samples.
- Custom piezoelectric transducers detected photoacoustic signals.
- Signals were amplified and recorded using a digitizing oscilloscope.
Main Results:
- Photoacoustic waves were successfully identified during bone ablation.
- A direct correlation was observed between laser fluence and stress wave amplitude.
Conclusions:
- Optimizing laser fluence is crucial to balance ablation efficiency and stress generation.
- Generated acoustic power levels remain within safe limits for surgical applications.
