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Journal Articles Journal de Mathématiques Pures et Appliquées Year : 2016

Spectroscopic imaging of a dilute cell suspension


The paper aims at analytically exhibiting for the first time the fundamental mechanisms underlying the fact that effective biological tissue electrical properties and their frequency dependence reflect the tissue composition and physiology. For doing so, a homogenization theory is derived to describe the effective admittivity of cell suspensions. A new formula is reported for dilute cases that gives the frequency dependent effective admittivity with respect to the membrane polarization. Different microstructures are shown to be distinguishable via spectroscopic measurements of the overall admittivity using the spectral properties of the membrane polarization. The Debye relaxation times associated with the membrane polarization tensor are shown to be able to give the microscopic structure of the medium. A natural measure of the admittivity anisotropy is introduced and its dependence on the frequency of applied current is derived. A Maxwell-Wagner-Fricke formula is given for concentric circular cells, and the results can be extended to the random cases. A randomly deformed periodic medium is also considered and a new formula is derived for the overall admittivity of a dilute suspension of randomly deformed cells

Dates and versions

hal-01436816 , version 1 (16-01-2017)



Habib Ammari, Josselin Garnier, Laure Giovangigli, Wenjia Jing, Jin Keun Seo. Spectroscopic imaging of a dilute cell suspension. Journal de Mathématiques Pures et Appliquées, 2016, 105 (5), pp.603-661. ⟨10.1016/j.matpur.2015.11.009⟩. ⟨hal-01436816⟩
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