Sampling tissue volumes using frequency-domain photon migration

2001

We introduce a novel and efficient method to provide solutions to inverse photon migration problems in heterogeneous turbid media. The method extracts derivative information from a single Monte Carlo simulation to permit the rapid determination of rates of change in the detected photon signal with respect to perturbations in background tissue optical properties. We then feed this derivative information to a nonlinear optimization algorithm to determine the optical properties of the tissue heterogeneity under examination.

Applied …, 1999

Stochastic reconstruction techniques are developed for mapping the interior optical properties of tissues from exterior frequency-domain photon migration measurements at the air–tissue interface. Parameter fields of absorption cross section, fluorescence lifetime, and ...

BJSTR, 2017

This paper proposes a method of accurate light distribution using the Monte Carlo Simulation. In a Photodynamic Therapy (PDT), accurate light penetration depths are especially important as it is to be expected that applying too little light or too much light could result in inadequate tumor cell kill. The basic theory of this method is statistical iteration of simulation at phantom medium and can model any complex condition in biological tissues without any kind of tool. We performed Monte Carlo simulation with phantom layer having the optical properties of biological tissues. In this result, we could obtained the acceptable light dosimetry in biological phantom. Monte Carlo simulation is very powerful approaching model in radiation transfer for solving a variety of physical and mathematical problems. Recently, Photodynamic therapy (PDT) method becomes one of the methods to treat cancer using light. It is necessary to measure the light dosimetry in tissue to apply PDT for cancer to patient. To measure light dosimetry accurately, One must understand the light propagation in tissue and simulate with optical properties of target tissue. Optical coefficients are basically three interaction coefficients: absorption coefficient (μa), scattering coefficient (μs) and phase function [1-4]. It is very important to measure the correct optical properties in biological tissue to execute Monte Carlo simulation. If one want to perform with correct optical properties in simulation, he should have to measure the light doses in biological tissue.

Computer Methods and Programs in Biomedicine, 2006

Optics Letters, 2011

Humanities, 2013

In marked contrast with medieval Tantra and Haṭhayoga, notions of the subtle body in modern yoga are almost completely subordinated to physical postural practices (āsanas), or meditation practices, which are framed as ‘system[s] of health, fitness, and well-being’ (Singleton 2010, 29-33). Where the subtle body is encountered in modern yoga texts and classes, it is generally conflated with the three principle internal channels (nāḍīs) and conceptions of vital breath (prāṇa) and subtle force in the base of the spine (kuṇḍalinī), now associated with healing, and self-realisation. Given the almost total absence of āsanas in medieval Tantric and Haṭhayoga texts, it is curious indeed that modern yoga has come to focus on the physical bodily practice and meditation almost exclusively. This essay examines some of the major influential figures who contributed to the understanding of the subtle body in modern Meditational schools of yoga.

Dr Neville Buch ABN: 86703686642, 2024

Steiner Education is again on the spiral rise for Australian learning. Henk Bak has produced a book, “World-Views in Dialogue,” with the sub-title, “Towards renewal of the Golden Rule in understanding and in action.” Added on the cover is the words, “Reflection of an intercultural/interfaith – ‘walking mediation’ project at Evera, Trentham, Victoria – Australia.” Henk Bak is one of those rare and leading global-Australian scholars who are situated. This is an important background essay for Bak’s work, introducing the thinking of Johann Wolfgang von Goethe and Rudolf Steiner and how it is being used today; and following the publication in 2007 of John Armstrong’s Love, Life, Goethe: How to be Happy in an Imperfect World (Penguin Press).