Modelling of uncertainties in ultrasound sensor locations in photoacoustic tomography

Teemu Sahlström; Aki Pulkkinen; Jenni Tick; Jarkko Leskinen; Tanja Tarvainen

doi:10.1117/12.2543024

17 February 2020 Modelling of uncertainties in ultrasound sensor locations in photoacoustic tomography

Teemu Sahlström, Aki Pulkkinen, Jenni Tick, Jarkko Leskinen, Tanja Tarvainen

Proceedings Volume 11240, Photons Plus Ultrasound: Imaging and Sensing 2020; 112402L (2020) https://doi.org/10.1117/12.2543024
Event: SPIE BiOS, 2020, San Francisco, California, United States

Abstract

Photoacoustic tomography (PAT) is an imaging modality developed during the past few decades. In the inverse problem of PAT, the aim is to estimate the spatial distribution of an initial pressure p₀ generated by the photoacoustic effect, when photoacoustic time-series pt measured on the boundary of the imaged target are given. To produce accurate photoacoustic images, the forward model linking p₀ to p_t has to model the measurement setup and the underlying physics to a sufficient accuracy. Use of an inaccurate model can lead to significant errors in the solution of the inverse problem. In this work, we study the effect and compensation of modelling errors due to uncertainties in ultrasound sensor locations in PAT using Bayesian approximation error modelling. The approach is evaluated with simulated and experimental data using various levels of measurement noise, uncertainties in sensor locations and varying sensor geometries. The results indicate that even small errors in the modelling of ultrasound sensor locations can lead to large errors in the solution of the inverse problem. Furthermore, the magnitude of these errors is affected by the amount of measurement noise and the measurement The modelling errors can, however, be well compensated by the approximation error modelling.

Conference Presentation

Citation Download Citation

Teemu Sahlström, Aki Pulkkinen, Jenni Tick, Jarkko Leskinen, and Tanja Tarvainen "Modelling of uncertainties in ultrasound sensor locations in photoacoustic tomography", Proc. SPIE 11240, Photons Plus Ultrasound: Imaging and Sensing 2020, 112402L (17 February 2020); https://doi.org/10.1117/12.2543024

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