Share Email Print

Proceedings Paper

Use of multiple data types in time-resolved optical absorption and scattering tomography
Author(s): Simon Robert Arridge; Martin Schweiger
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

In Time-resolved Optical Absorption and Scattering Tomography (TOAST) the imaging problem is to reconstruct the coefficients of absorption (mu)a and scattering (mu)s of light in tissue given the time-dependent photon flux at the surface of the subject, resulting from ultrafast laser input pulses. This inverse problem is mathematically similar to the Electrical Impedance problem (EIT) but presents some unique features. In particular the necessity of searching in two solution spaces requires the use of multiple data types that are maximally uncorrelated with respect to the solution spaces. We developed an algorithm for TOAST that uses an iterative non-linear gradient descent method to minimize an appropriate error norm. The algorithm can work on multiple types of data and an important topic is the choice of the best data format to use. Usually the choice is integrated intensity and mean time- of-flight for the temporal domain data. In this paper we compare these data types with the use of higher order moments of the temporal distribution (variance, skew, kurtosis). We show that reliable results must take detailed account of the confidence limits on each data point. We demonstrate how the probability distribution function for photon propagation can be calculated so that the variance of any given measurement type can be derived.

Paper Details

Date Published: 23 June 1993
PDF: 12 pages
Proc. SPIE 2035, Mathematical Methods in Medical Imaging II, (23 June 1993); doi: 10.1117/12.146604
Show Author Affiliations
Simon Robert Arridge, Univ. College London (United Kingdom)
Martin Schweiger, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 2035:
Mathematical Methods in Medical Imaging II
Joseph N. Wilson; David C. Wilson, Editor(s)

© SPIE. Terms of Use
Back to Top