Taking advantage of acoustic inhomogeneities in photoacoustic measurements - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2016

Taking advantage of acoustic inhomogeneities in photoacoustic measurements

Anabela da Silva
Charles Handschin
  • Fonction : Auteur
Christophe Riedinger
  • Fonction : Auteur
Amélie Litman
  • Fonction : Auteur
Hassan Akhouayri
  • Fonction : Auteur
ILM

Résumé

Photoacoustic offers promising perspectives in probing and imaging subsurface optically absorbing structures in biological tissues. The optical fluence absorbed is partly dissipated into heat accompanied with microdilatations that generate acoustic pressure waves, the intensity which is related to the amount of fluence absorbed. Hence the photoacoustic signal measured offers access, at least potentially, to a local monitoring of the absorption coefficient, in 3D if tomographic measurements are considered. However, due to both the diffusing and absorbing nature of the surrounding tissues, the major part of the fluence is deposited locally at the periphery of the tissue, generating an intense acoustic pressure wave that may hide relevant photoacoustic signals. Experimental strategies have been developed in order to measure exclusively the photoacoustic waves generated by the structure of interest (orthogonal illumination and detection). Temporal or more sophisticated filters (wavelets) can also be applied. However, the measurement of this primary acoustic wave carries a lot of information about the acoustically inhomogeneous nature of the medium. We propose a protocol that includes the processing of this primary intense acoustic wave, leading to the quantification of the surrounding medium sound speed, and, if appropriate to an acoustical parametric image of the heterogeneities. This information is then included as prior knowledge in the photoacoustic reconstruction scheme to improve the localization and quantification.
Fichier principal
Vignette du fichier
main_PAT_BIOS2016.pdf (551.56 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03515259 , version 1 (06-01-2022)

Identifiants

Citer

Anabela da Silva, Charles Handschin, Christophe Riedinger, Julien Piasecki, Serge Mensah, et al.. Taking advantage of acoustic inhomogeneities in photoacoustic measurements. SPIE BiOS, Feb 2016, San Francisco, United States. pp.97082B, ⟨10.1117/12.2209549⟩. ⟨hal-03515259⟩
6 Consultations
22 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More