Tanja Tarvainen will give a seminar entitled "Tomography using light and sound" on Tuesday, September 26, at 09:00 a.m. at Institut Fresnel in Pierre Cotton room.
Abstract : Optical imaging uses visible or near-infrared light to interrogate the internal properties of biological tissues based on endogenous (e.g. haemoglobin) or exogenous (e.g. contrast agents) contrast. Several optical imaging modalities have been developed, including, for example, diffuse optical tomography. In these imaging modalities, the physiological nature of chromophores in tissues gives rise to a unique contrast. However, the complex behaviour of light propagation results in poor resolution, due to the strongly ill-posed and non-linear nature of the image reconstruction problem. Combining light with ultrasound in so-called coupled physics imaging can overcome these limitations. For example, in photoacoustic imaging, the unique contrast of light is combined with the resolution of ultrasound utilising the photoacoustic effect. In this talk, I will discuss imaging with light with a focus on tomographic imaging. Principles of diffuse optical tomography and photoacoustic tomography are reviewed. Further, I will discuss light propagation in tissue and tomography, and how an ill-posed tomography problem can be approached using computational methods.
Biography : Tanja Tarvainen is a professor of computational imaging and modelling at the University of Eastern Finland. She received her PhD in physics from the University of Kuopio in 2006 and worked as a postdoc in the University College London. Her research interests include optical and photoacoustic imaging, modelling of light transport, computational and Bayesian inverse problems, and uncertainty quantification.
Invitation : Anabela da Silva & Europhotonics program
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