Photoacoustic inversion formulas using mixed data on finite time intervals

• Main Authors: Dreier, F. (Author), Haltmeier, M. (Author)
• Format: Article
• Language: English
• Published: Institute of Physics 2022
• Subjects: Abel integral equation; Abel integral equations; Acoustic pressures; Computerized tomography; Finite time intervals; image reconstruction; Image reconstruction; Images reconstruction; Integral equations; Inverse problems; Inverse source problem; inversion formula; Inversion formulae; Mixed data; photoacoustic computed tomography; Photoacoustic computed tomography; Photoacoustic effect; Photoacoustic tomography; wave equation; Wave equations; Weighted linear combinations
• Online Access: View Fulltext in Publisher

 We study the inverse source problem in photoacoustic tomography (PAT) for mixed data, which denote a weighted linear combination of the acoustic pressure and its normal derivative on an observation surface. We consider in particular the case where the data are only available on finite time intervals, which accounts for real-world usage of PAT where data are only feasible within a certain time interval. Extending our previous work, we derive explicit formulas up to a smoothing integral on convex domains with a smooth boundary, yielding exact reconstruction for circular or elliptical domains. We also present numerical reconstructions of our new exact inversion formulas on finite time intervals and compare them with the reconstructions of our previous formulas for unlimited time wave measurements. © 2022 The Author(s). Published by IOP Publishing Ltd.