24 Questions 22 Answers 0 Followers
Questions related from Amir Borumand
Dear all, I have a differential equation which encompasses a multiplication two unknowns (u &w) at the above manner (both are functions of time and space). I do not understand how it should...
24 May 2020 5,333 5 View
Dear All, I was wondering why sometime in finite element formulation, the weight function is considered as W=Ni. While weight function normally is the expansion of Ni multiplied with a...
29 March 2019 9,088 5 View
Dear All, I was wondering, why in FE formulation, and in the case that both Dirichlet and Neumann BCS are imposed, the weight function (W or v) on the boundary is considered to be zero? Would...
26 March 2019 6,800 5 View
Hi All, I was wondering why in diffuse optics pencil beam (which is the case for most of practical situations) is replaced/approximated with isotropic point light source inside the medium? Thank you.
05 July 2016 1,041 3 View
Dear All, I need to construct phantoms with defined optical properties and I am using materials/chemical that their optical properties are not available. I need to know their optical properties...
04 July 2016 6,525 6 View
Hi All, I want to compare my Monte Carlo simulaiton results to available anlytical solution. My target is light intensity at the top surface. I use Farrell's relationship to describe light...
18 April 2016 2,773 5 View
Dear All, I am using a mesh based Monte Carlo (MC) package (TIM-OS) and want to compare surface intensity with analytical solutions (e.g. Farrell et al). MC packages give Fluence as output...
16 March 2016 3,169 3 View
Hi All, I want to collimate and parallel and finally densely pack beams coming out of multiple (say 4) laser diode to be coupled to a fiber optic. In the literature some people have used small...
13 January 2016 9,937 1 View
Hi All, I am wondering how the reflectance of tissue can be obtained from Monte Carlo simulations? Monte carlo simulations need parameters like coefficients of scattering and absorption, as well...
15 October 2015 4,165 5 View
Hi All, I need to couple multiple LEDs (with different wavelengths) into one fiber, while I don't want any mixing. I have to be able to switch between channels/wavelengths. There are some...
30 August 2015 6,076 4 View
Hi all, I'm modelling the light distribution on tissue surface. My light source would be an LED which its light is collimated via a lens and collimated light is transferred into the tissue using a...
17 August 2015 7,773 5 View
Hi All, I have done some imaging using a CMOS camera, taking sequential images at different shutter speeds which then were blended in Photomatix. But even after blending them the range still is...
12 August 2015 8,492 5 View
Hi All, How the required dynamic range of image analysis could be calculated? I have a camera and a number of images as starting point, based on which I need to decide about the required dynamic...
02 August 2015 1,160 2 View
Hi All, Just wondering what is the point with analyzing an image in different R, G and B channels? Does it yield any data about the source? How about the detector (in fact, camera by which image...
31 July 2015 1,102 11 View
Dear All, How one could obtain the relationship between the number of photons in Monte Carlo simulations and power (or any other useful characteristic) of the light source in real experiments? I...
30 July 2015 9,907 3 View
Hi All, How one can find the co-efficient of scattering and absorption of a constructed phantom as a function of volume fraction of scattering and absorption agents? What is the relationship? Also...
12 July 2015 7,782 3 View
Hi All, I have to set up a phantom study as well as an in vivo study for measuring light reflectance spectra of human tissue using diffuse reflectance spectroscopy technique. I have to choose up...
30 June 2015 2,026 4 View
Dear All, Wondering what would be the definition of attenuation and diffusion coefficients, their relationship with blood volume fraction ? Does the relationship differs case to case (different...
15 April 2015 8,565 6 View
Dear All, I'm modeling light propagation in tissue using monte carlo method. But don't actually know how a model can be calibrated? Also what are the options for model validation? Thank you very...
15 April 2015 1,506 3 View
Dear All, As a newbie to the field, would be great full if I could know the definition of the mentioned terms in optics. And what would be a good to source to learn more about them. Thank you very...
15 April 2015 3,490 2 View
Hi All, Was wondering what is voxel based monte carlo method? Thank you very much.
02 March 2015 2,903 2 View
I would like to simulate the Darcy problem in a porous medium undergoing large deformations, but I'm not sure what commercial packages would be able to do that. Do you have any guidance or insight...
17 February 2015 8,425 9 View
I need to understand what is the difference between these two parameters. Also need to know if Monte Carlo method is able to compute them ? If not what other algorithms could...
15 February 2015 1,989 3 View
Dear All, It seems that light propagation in tissue like skin can be modeled using ray tracing softwares, though in most of references Monte Carlo method has been used for this purpose. I need to...
11 February 2015 7,194 2 View
