Photoacoustic inversion formulas using mixed data on finite time intervals*Funding: This work has been supported by the Austrian Science Fund (FWF), Project P 30747-N32. (1st August 2022)

• Record Type: Journal Article
• Authors: Dreier, Florian; Haltmeier, Markus
• Is Part Of: Inverse problems. Volume 38:Number 8(2022)
• Publication Date: 2022-08-01
• Subjects: image reconstruction -- wave equation -- Abel integral equations -- inversion formula -- photoacoustic computed tomography; Inverse problems (Differential equations) -- Periodicals; 515.357
• DOI: 10.1088/1361-6420/ac747b
• Languages: English
• ISSNs: 0266-5611

Abstract

Abstract: 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.