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 Sorg; T. Joshua Pfefer; Joel M.H. Teichman; H. Stan McGuff; Hans Pratisto; E. Duco Jansen; A. J. Welch

doi:10.1117/12.384253

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 Sorg, T. Joshua Pfefer, Joel M.H. Teichman, H. Stan McGuff, Hans Pratisto, E. Duco Jansen, A. J. Welch

Research output: Contribution to journal › Conference article › peer-review

1 Scopus citations

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 (FEL) 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 found to be in agreement with a thermal ablation model for which the threshold fluences were proportional to 1/μ_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.

Original language	English (US)
Pages (from-to)	60-68
Number of pages	9
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	3925
DOIs	https://doi.org/10.1117/12.384253
State	Published - 2000
Externally published	Yes
Event	Biomedical Applications of Free-Electron Lasers - San Jose, CA, USA Duration: Jan 22 2000 → Jan 22 2000

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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10.1117/12.384253

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Chan, K. F., Hammer, D. X., Choi, B., Vargas, G., Sorg, B., Pfefer, T. J., Teichman, J. M. H., McGuff, H. S., Pratisto, H., Jansen, E. D., & Welch, A. J. (2000). Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation. Proceedings of SPIE - The International Society for Optical Engineering, 3925, 60-68. https://doi.org/10.1117/12.384253

Chan, KF, Hammer, DX, Choi, B, Vargas, G, Sorg, B, Pfefer, TJ, Teichman, JMH, McGuff, HS, Pratisto, H, Jansen, ED & Welch, AJ 2000, 'Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation', Proceedings of SPIE - The International Society for Optical Engineering, vol. 3925, pp. 60-68. https://doi.org/10.1117/12.384253

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title = "Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation",

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 (FEL) 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 found to be in agreement with a thermal ablation model for which the threshold fluences were proportional to 1/μa. 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.",

author = "Chan, {Kin Foong} and Hammer, {Daniel X.} and Bernard Choi and Gracie Vargas and Brian Sorg and Pfefer, {T. Joshua} and Teichman, {Joel M.H.} and McGuff, {H. Stan} and Hans Pratisto and Jansen, {E. Duco} and Welch, {A. J.}",

year = "2000",

doi = "10.1117/12.384253",

language = "English (US)",

volume = "3925",

pages = "60--68",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

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note = "Biomedical Applications of Free-Electron Lasers ; Conference date: 22-01-2000 Through 22-01-2000",

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T1 - Influence of optical absorption on urinary calculus threshold fluence and ablation efficiency during infrared laser ablation

AU - Chan, Kin Foong

AU - Hammer, Daniel X.

AU - Choi, Bernard

AU - Vargas, Gracie

AU - Sorg, Brian

AU - Pfefer, T. Joshua

AU - Teichman, Joel M.H.

AU - McGuff, H. Stan

AU - Pratisto, Hans

AU - Jansen, E. Duco

AU - Welch, A. J.

PY - 2000

Y1 - 2000

N2 - 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 (FEL) 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 found to be in agreement with a thermal ablation model for which the threshold fluences were proportional to 1/μa. 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.

AB - 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 (FEL) 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 found to be in agreement with a thermal ablation model for which the threshold fluences were proportional to 1/μa. 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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SN - 0277-786X

VL - 3925

SP - 60

EP - 68

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

T2 - Biomedical Applications of Free-Electron Lasers

Y2 - 22 January 2000 through 22 January 2000

ER -

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

Abstract

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