Time-resolved measurements of ultrashort light pulses transmitted through turbid scattering media have been performed to determine the possibilities and the limitations of a first-order perturbation approach to recover the absorption coefficient of different tissue-like cylindrical absorptive phantoms. The model accounts for the effect of a spatially varying absorption coefficient of an inclusion on the time-resolved transmittance. We have determined the absorption coefficient of the inhomogeneities located at the midplane of a scattering cell by fitting the diffusion approximation-based perturbation model to the experimental time-resolved contrast measurements. The accuracy of the model predictions is discussed. An error analysis of the fitting procedure is also presented.
A perturbation approach to characterize absorptive inclusions in diffusing media by time-resolved contrast measurements / Esposito, Rosario; S., de Nicola; M., Lepore; I., Delfino; P. L., Indovina. - In: JOURNAL OF OPTICS. A, PURE AND APPLIED OPTICS. - ISSN 1464-4258. - 6:(2004), pp. 736-741. [10.1088/1464-4258/6/7/013]
A perturbation approach to characterize absorptive inclusions in diffusing media by time-resolved contrast measurements
ESPOSITO, ROSARIO;
2004
Abstract
Time-resolved measurements of ultrashort light pulses transmitted through turbid scattering media have been performed to determine the possibilities and the limitations of a first-order perturbation approach to recover the absorption coefficient of different tissue-like cylindrical absorptive phantoms. The model accounts for the effect of a spatially varying absorption coefficient of an inclusion on the time-resolved transmittance. We have determined the absorption coefficient of the inhomogeneities located at the midplane of a scattering cell by fitting the diffusion approximation-based perturbation model to the experimental time-resolved contrast measurements. The accuracy of the model predictions is discussed. An error analysis of the fitting procedure is also presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
