Relation between fluence rate and mean photons pathlengths: an alternative option for Monte Carlo-based calculations of fluence

Federico Tommasi; Angelo Sassaroli; Lorenzo Fini; Stefano Cavalieri; Ernesto Pini; Lorenzo Pattelli; Fabrizio Martelli

doi:10.1117/12.2670936

9 August 2023 Relation between fluence rate and mean photons pathlengths: an alternative option for Monte Carlo-based calculations of fluence

Federico Tommasi, Angelo Sassaroli, Lorenzo Fini, Stefano Cavalieri, Ernesto Pini, Lorenzo Pattelli, Fabrizio Martelli

Author Affiliations +

Proceedings Volume 12628, Diffuse Optical Spectroscopy and Imaging IX; 126282I (2023) https://doi.org/10.1117/12.2670936
Event: European Conferences on Biomedical Optics, 2023, Munich, Germany

Abstract

Usually, in biomedical optics, the average photon fluence rate, evaluated in a subvolume of a propagating medium, is obtained by Monte Carlo simulations by calculating the power deposited by photons absorbed in the subvolume. We propose an alternative method based on evaluating the average path length traveled by all photons injected within the subvolume. Application examples are given. This method also works for a zero absorption coefficient and for a nonconstant spatial distribution of the absorption coefficient within the subvolume. The proposed approach is a re-visitation of a well-known method applied to nuclear and radiation physics. The results obtained show that a potential advantage of the proposed method is that it can improve the convergence of Monte Carlo simulations. Indeed, when calculating the fluence in a region of interest with the proposed method, all photons passing through the region are considered. Whereas with the traditional approach, only absorbed" photons are considered. In the latter case, this can produce a poorer Monte Carlo statistic for the same number of photons launched.

Citation Download Citation

Federico Tommasi, Angelo Sassaroli, Lorenzo Fini, Stefano Cavalieri, Ernesto Pini, Lorenzo Pattelli, and Fabrizio Martelli "Relation between fluence rate and mean photons pathlengths: an alternative option for Monte Carlo-based calculations of fluence", Proc. SPIE 12628, Diffuse Optical Spectroscopy and Imaging IX, 126282I (9 August 2023); https://doi.org/10.1117/12.2670936

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Photons

Simulations

Monte Carlo methods

Absorption

Biomedical optics

Scattering

Optical properties

Show All Keywords

Keywords/Phrases

Search In:

Publication Years