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Proceedings Paper

Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation
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Paper Abstract

The objectives of this study were to determine if the optical absorption properties of urinary calculi affect the threshold fluence for ablation or fragmentation and the ablation efficiency due to laser irradiation. The Vanderbilt free electron laser was tuned to selected wavelengths based on the absorption spectrum of various types of urinary calculi. The threshold fluences for ablation of the calculi were measured at different wavelengths. A preliminary study of the ablation efficiency (ablation depth per unit incidence fluence) was performed. The results were fond to be in agreement with a thermal ablation model for which the threshold fluences were proportional to l/(mu) a. The ablation efficiencies were higher in regions of the infrared spectra in which absorption was higher. For a fixed laser irradiation, the lower threshold fluences within regions of high optical absorption allowed more energy to enhance calculus ablation. This study provided insight into determining the optimum wavelengths for ablation and laser lithotripsy.

Paper Details

Date Published: 28 April 2000
PDF: 9 pages
Proc. SPIE 3925, Biomedical Applications of Free-Electron Lasers, (28 April 2000); doi: 10.1117/12.384253
Show Author Affiliations
Kin Foong Chan, Univ. of Texas/Austin (United States)
Daniel X. Hammer, Univ. of Texas/Austin (United States)
Bernard Choi, Univ. of Texas/Austin (United States)
Gracie Vargas, Univ. of Texas/Austin (United States)
Brian S. Sorg, Univ. of Texas/Austin (United States)
T. Joshua Pfefer, Univ. of Texas/Austin (United States)
Joel M. H. Teichman M.D., Univ. of Texas Health Science Ctr. (United States)
H. Stan McGuff, Univ. of Texas Health Science Ctr. (United States)
Hans Surya Pratisto, Vanderbilt Univ. (United States)
E. Duco Jansen, Vanderbilt Univ. (United States)
Ashley J. Welch, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 3925:
Biomedical Applications of Free-Electron Lasers
Glenn S. Edwards; John Clark Sutherland, Editor(s)

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