Modeling laser treatment of port wine stains with a computer- reconstructed biopsy

T. Joshua Pfefer, Jennifer K Barton, Derek J. Smithies, Thomas E. Milner, J. Stuart Nelson, Martin J C Van Gemert, Ashley J. Welch

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

Background and Objective: The efficacy of laser treatment of port wine stains (PWS) has been shown to be highly dependent on patient-specific vasculature. The effect of tissue structure on optical and thermal mechanisms was investigated for different pulse durations by using a novel theoretical model that incorporates tissue morphology reconstructed tomographically from a PWS biopsy. Study Design/Materials and Methods: An optical-thermal numerical model capable of simulating arbitrarily complex, three-dimensional tissue geometries was developed. The model is comprised of (1) a voxel-based Monte Carlo optical model, (2) a finite difference thermal model, and (3) an Arrhenius rate process calculation to predict the distribution of thermal damage. Simulations based on previous computer-based reconstruction of a series of 6 μm sections from a PWS biopsy were performed for laser pulse durations (τ(p)) of 0.5, 5.0, and 10.0 ms at a wavelength of 585 nm. Results: Energy deposition rate in the blood vessels was primarily a function of vessel depth in skin, although shading effects were evident. Thermal confinement and selectivity of damage were seen to be inversely proportional to pulse duration. The model predicted blood-specific damage for τ(p) = 0.5 ms, vascular and perivascular damage for τ(p) = 5 ms, and widespread damage in superficial regions for τ(p) = 10 ms. The effect of energy deposition in the epidermis was most pronounced for longer pulse durations, resulting in increased temperature and extent of damage. Conclusion: Pulse durations between 0.5 and 5 ms are likely optimal for the PWS analyzed. The incorporation of a tomographically reconstructed PWS biopsy into an optical- thermal model represents a significant advance in numerical modeling of laser-tissue interaction.

Original languageEnglish (US)
Pages (from-to)151-166
Number of pages16
JournalLasers in Surgery and Medicine
Volume24
Issue number2
DOIs
StatePublished - 1999

Fingerprint

Port-Wine Stain
Lasers
Hot Temperature
Biopsy
Blood Vessels
Therapeutics
Epidermis
Theoretical Models
Skin
Temperature

Keywords

  • Finite difference
  • Heat transfer
  • Light propagation
  • Monte Carlo
  • Numerical modeling
  • Pulse duration
  • Thermal damage
  • Tissue reconstruction

ASJC Scopus subject areas

  • Surgery

Cite this

Modeling laser treatment of port wine stains with a computer- reconstructed biopsy. / Pfefer, T. Joshua; Barton, Jennifer K; Smithies, Derek J.; Milner, Thomas E.; Nelson, J. Stuart; Van Gemert, Martin J C; Welch, Ashley J.

In: Lasers in Surgery and Medicine, Vol. 24, No. 2, 1999, p. 151-166.

Research output: Contribution to journalArticle

Pfefer, T. Joshua ; Barton, Jennifer K ; Smithies, Derek J. ; Milner, Thomas E. ; Nelson, J. Stuart ; Van Gemert, Martin J C ; Welch, Ashley J. / Modeling laser treatment of port wine stains with a computer- reconstructed biopsy. In: Lasers in Surgery and Medicine. 1999 ; Vol. 24, No. 2. pp. 151-166.
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abstract = "Background and Objective: The efficacy of laser treatment of port wine stains (PWS) has been shown to be highly dependent on patient-specific vasculature. The effect of tissue structure on optical and thermal mechanisms was investigated for different pulse durations by using a novel theoretical model that incorporates tissue morphology reconstructed tomographically from a PWS biopsy. Study Design/Materials and Methods: An optical-thermal numerical model capable of simulating arbitrarily complex, three-dimensional tissue geometries was developed. The model is comprised of (1) a voxel-based Monte Carlo optical model, (2) a finite difference thermal model, and (3) an Arrhenius rate process calculation to predict the distribution of thermal damage. Simulations based on previous computer-based reconstruction of a series of 6 μm sections from a PWS biopsy were performed for laser pulse durations (τ(p)) of 0.5, 5.0, and 10.0 ms at a wavelength of 585 nm. Results: Energy deposition rate in the blood vessels was primarily a function of vessel depth in skin, although shading effects were evident. Thermal confinement and selectivity of damage were seen to be inversely proportional to pulse duration. The model predicted blood-specific damage for τ(p) = 0.5 ms, vascular and perivascular damage for τ(p) = 5 ms, and widespread damage in superficial regions for τ(p) = 10 ms. The effect of energy deposition in the epidermis was most pronounced for longer pulse durations, resulting in increased temperature and extent of damage. Conclusion: Pulse durations between 0.5 and 5 ms are likely optimal for the PWS analyzed. The incorporation of a tomographically reconstructed PWS biopsy into an optical- thermal model represents a significant advance in numerical modeling of laser-tissue interaction.",
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