Application of the vector Monte-Carlo method in polarisation optical coherence tomography

Abstract

A brief review of established methods shows that only with the Berthelot technique is it possible to see a finite volume of liquid in sustained mechanical tension. A short discussion of the practice and theory reveals two uncertainties with the conventional technique : that of the determination of a true filling temperature, and the influence of compliance by the glass on the tension developed. A description is then given of a modified apparatus with which these difficulties do not arise. The tube is formed into a coil which deflects sufficiently to indicate internal pressure or tension, and by monitoring these deflections with a distance meter a record of pressure/ tension against temperature can be made. The course of a typical run is shown from which the excess pressure, filling temperature and limiting tension may all be estimated with much greater precision than befoie. The orders of magnitude of the results obtained are indicated, and a possible influence of non-uniform gaseous supersaturation is suggested.

Imitation of optical coherence tomography images by wave Monte Carlo-based approach implemented with the Leontovich–Fock equation

“…To compare the simulation results of recording the characteristics of biological tissue with a wave and particle OCT methods, we used a skin model with nevus, 4,5,12,50,51 which is used extensively in various modeling studies utilizing conventional MC. The relationship between the parameters of the microscopic model of a randomly inhomogeneous medium [Eq.…”

“…1 The interpretation of the OCT images and quantitative assessment of the structural and optical parameters of turbid scattering biological tissues requires the development of realistic computational models for ultimate understanding of the formation of OCT images. Typically, for modeling of the light propagation in biological tissues and tissue-like scattering media, including mimicking of OCT images, either a plane wave approximation [2][3][4][5] or the conventional Monte Carlo (MC) method [6][7][8][9][10][11][12][13][14][15] is used. In fact, both of these approaches have some disadvantages.…”

Imitation of ultra-sharp light focusing within turbid tissue-like scattering medium by using time-independent Helmholtz equation and method Monte Carlo

“…We consider the unidirectional Helmholtz equation in a randomly inhomogeneous medium for modeling biological tissue similarly to [15]. In this case, the equation for the field  will have the form…”

“…An approach to modeling the propagation of optical radiation within biological tissues based on the corpuscular Monte Carlo method is well known [1][2][3], has been applied for the study of OCT image formation [14], and later modified for the modeling of polarization-based OCT [15,16]. In fact, this approach has several limitations [17] that manifest itself in super-sharp focusing when the numerical aperture is close to or less than one.…”

Forced Detection Monte Carlo Algorithms for Accelerated Blood Vessel Image Simulations

“…Another variance reduction method, foremost used in atmospheric optics, nuclear and particle physics, and radiology, is forced detection (FD) [8][9][10][11][12]. This method is useful when the probability for a photon to hit the detector is very low [12].…”