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Research Papers

Thin polymer etalon arrays for high-resolution photoacoustic imaging

[+] Author Affiliations
Yang Hou

University of Michigan, Department of Electrical Engineering and Computer Science, 1107 Carl A. Gerstacker Building, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109

Sheng-Wen Huang, Shai Ashkenazi

University of Michigan, Department of Biomedical Engineering, 1107 Carl A. Gerstacker Building, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109

Russell Witte

University of Arizona, Department of Radiology, AHSC, P.O. Box 245067, Building 211, Room 124, 1609 N. Warren Avenue, Tucson, Anzona 85724

Matthew O’Donnell

University of Washington, Department of Bioengineering, 371 Loew Hall, Box 352180, Seattle, Washington 98195

J. Biomed. Opt. 13(6), 064033 (January 15, 2008September 08, 2008October 22, 2008December 23, 2008). doi:10.1117/1.3042260
History: Received January 15, 2008; Revised September 08, 2008; Accepted October 22, 2008; Published December 23, 2008
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Thin polymer etalons are demonstrated as high-frequency ultrasound sensors for three-dimensional (3-D) high-resolution photoacoustic imaging. The etalon, a Fabry-Perot optical resonator, consists of a thin polymer slab sandwiched between two gold layers. It is probed with a scanning continuous-wave (CW) laser for ultrasound array detection. Detection bandwidth of a 20-μm-diam array element exceeds 50MHz, and the ultrasound sensitivity is comparable to polyvinylidene fluoride (PVDF) equivalents of similar size. In a typical photoacoustic imaging setup, a pulsed laser beam illuminates the imaging target, where optical energy is absorbed and acoustic waves are generated through the thermoelastic effect. An ultrasound detection array is formed by scanning the probing laser beam on the etalon surface in either a 1-D or a 2-D configuration, which produces 2-D or 3-D images, respectively. Axial and lateral resolutions have been demonstrated to be better than 20μm. Detailed characterizations of the optical and acoustical properties of the etalon, as well as photoacoustic imaging results, suggest that thin polymer etalon arrays can be used as ultrasound detectors for 3-D high-resolution photoacoustic imaging applications.

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© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Yang Hou ; Sheng-Wen Huang ; Russell Witte ; Matthew O’Donnell and Shai Ashkenazi
"Thin polymer etalon arrays for high-resolution photoacoustic imaging", J. Biomed. Opt. 13(6), 064033 (January 15, 2008September 08, 2008October 22, 2008December 23, 2008). ; http://dx.doi.org/10.1117/1.3042260


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