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

Kin Foong Chan; Daniel X. Hammer; Bernard Choi; Gracie Vargas; Brian S. Sorg; T. Joshua Pfefer; Joel M. H. Teichman M.D.; H. Stan McGuff; Hans Surya Pratisto; E. Duco Jansen; Ashley J. Welch

doi:10.1117/12.384253

28 April 2000 Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation

Kin Foong Chan, Daniel X. Hammer, Bernard Choi, Gracie Vargas, Brian S. Sorg, T. Joshua Pfefer, Joel M. H. Teichman M.D., H. Stan McGuff, Hans Surya Pratisto, E. Duco Jansen, Ashley J. Welch

Author Affiliations +

Proceedings Volume 3925, Biomedical Applications of Free-Electron Lasers; (2000) https://doi.org/10.1117/12.384253
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States

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.

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Kin Foong Chan, Daniel X. Hammer, Bernard Choi, Gracie Vargas, Brian S. Sorg, T. Joshua Pfefer, Joel M. H. Teichman M.D., H. Stan McGuff, Hans Surya Pratisto, E. Duco Jansen, and Ashley J. Welch "Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation", Proc. SPIE 3925, Biomedical Applications of Free-Electron Lasers, (28 April 2000); https://doi.org/10.1117/12.384253

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