Investigation of the influence of the scattering coefficient on acousto-optic modulation efficiency in turbid phantoms

Vermeulen, Huub (2012) Investigation of the influence of the scattering coefficient on acousto-optic modulation efficiency in turbid phantoms.

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Abstract:Photo-acoustic imaging (PAI) and acousto-optic imaging (AOI) are two front line biomedical photonic imaging modalities, developed to overcome the issues with deep tissue photonic imaging. A technique to compensate for fluence in photo-acoustic imaging (PAI) with the use of acousto-optic imaging (AOI) was developed by Daoudi et al. [1] The effect of local scattering on these modalities has not been taken into account yet. The objective of this study was therefore to investigate what influence the local scattering coefficient of the medium has on acousto-optic modulation in turbid phantoms. AOI and Pressure contrast imaging (PCI) measurements with self-made and characterized turbid agar gel phantoms were performed and a relation between scattering contrast and AO modulation is investigated. The results show that there is a prominent non-linear relation between scattering coefficient of the medium and AO modulation efficiency for a limited range of reduced scattering coefficient from 2 till 5 cm-1. For higher values the dependence of AO modulation efficiency on scattering coefficient becomes very small or so to speak negligible. However, the results obtained during this research work are qualitative and are yet to be quantified.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:44 medicine
Programme:Biomedical Technology BSc (56226)
Link to this item:http://purl.utwente.nl/essays/62119
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