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Published May 2003 | Published
Journal Article Open

Analytic explanation of spatial resolution related to bandwidth and detector aperture size in thermoacoustic or photoacoustic reconstruction


An analytic explanation of the spatial resolution in thermoacoustic or photoacoustic reconstruction is presented. Three types of specific recording geometries, including spherical, planar, and cylindrical surface, as well as other general cases, are investigated. Analytic expressions of the point-spread functions (PSF's), as a function of the bandwidth of the measurement system and the finite size of the detector aperture, are derived based on rigorous reconstruction formulas. The analyses clearly reveal that the dependence of the PSF's on the bandwidth of all recording geometries shares the same space-invariant expression while the dependence on the aperture size of the detector differs. The bandwidth affects both axial and lateral resolutions; in contrast, the detector aperture blurs the lateral resolution greatly but the axial resolution only slightly.

Additional Information

© 2003 The American Physical Society. Received 31 October 2002; published 9 May 2003. This project was sponsored in part by the U.S. Army Medical Research and Material Command Grant No. DAMD17-00-1-0455, the National Institutes of Health Grant Nos. R21 EB00319-02 and R01 EB000712, the National Science Foundation Grant No. BES-9734491, and the Texas Higher Education Coordinating Board Grant No. ARP 000512-0063-2001.

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Published - PhysRevE.67.056605.pdf


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