Mathematical modeling for the prediction and optimization of laser hair removal.

Background And Objective: The study of hair removal is a slow, tedious process. Efficacy evaluations require test-site observation for at least one complete hair cycle, a minimum of 6-8 months. In addition, tracking and counting individual hairs is extremely labor intensive.

Influence of the anagen:telogen ratio on Q-switched Nd:YAG laser hair removal efficacy.

Background And Objective: Laser hair removal is believed to affect only anagen hairs. However, proof of this belief in humans is lacking. The objective of this study was to determine the influence of the anagen: telogen ratio on the results of Q-switched Nd:YAG laser hair removal.

Feasibility of picosecond laser-Doppler flowmetry provides basis for time-resolved Doppler tomography of biological tissues.

A detectable signal is obtained from a laser Doppler flowmeter operating in the heterodyne mode with nano- and pico-second pulse laser sources. The ultrashort pulse probing may be useful for depth-dependent time-resolved laser Doppler velocity measurements of blood perfusion in biological tissues. © 1998 Society of Photo-Optical Instrumentation Engineers.

On refraction in Monte-Carlo simulations of light transport through biological tissues.

To obtain reliable results from Monte-Carlo simulations of light scattering experiments, a statistically accurate procedure for positioning the photons after refraction between two different scattering media is necessary. Two statistically equivalent algorithms for calculating the position of the photons immediately after crossing an interface are described and justified.

Probabilistic model of multiple light scattering based on rigorous computation of the first and the second moments of photon coordinates.

We consider a concise method based on recurrent relations that permit rigorous computing of the first and the second moments of the components of the vector locating a randomly walking photon in an infinite homogeneous light-scattering medium. On assumption that the components obey a three-dimensional Gaussian distribution a probability density for the photon locations at the Nth scattering event can readily be written down and the light-intensity distribution in the medium may be calculated. The results from theoretical analyses are compared with the solution of a light-diffusion equation and with results of Monte Carlo simulations and show a better fit with simulated data than the diffusion approximation.