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Proceedings Paper

Measurement of photoacoustic detector sensitivity distribution by robotic source placement
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Paper Abstract

Many photoacoustic imaging systems use back projection-based image reconstruction algorithms to estimate photoacoustic source locations from the time-of-flight pressure information collected by either a scanned single transducer or an array of stationary transducer elements. Accurate image reconstruction requires that the transducer(s) locations relative to the imaged volume and the transducer(s) sensitivity distribution within the imaged volume be accurately known. The objective of this work was to develop a method for estimation of the sensitivity distribution of a transducer array. Our approach was to capture for each transducer element the response to a photoacoustic point source that was robotically scanned throughout the imaging volume. The temporally resolved photoacoustic signal was then processed to obtain the relative transducer sensitivity at the source location. We performed a scan over a transducer array fabricated in our laboratory that consisted of twelve 3 mm elements in a 30 mm annular ring arrangement. We measured both the sensitivity distribution of single elements, from which the spatial and angular sensitivity profiles were extracted, as well as the simultaneous response of all transducer elements, which allowed us to locate the effective position of each element, but also highlighted the non-uniformity between transducers' response of up to 20%. We present these and other measured parameters, and discuss their significance as well as their effect on our image reconstruction algorithm.

Paper Details

Date Published: 28 February 2008
PDF: 10 pages
Proc. SPIE 6856, Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 685610 (28 February 2008); doi: 10.1117/12.763825
Show Author Affiliations
Pinhas Ephrat, Lawson Health Research Institute, St. Joseph's Health Care (Canada)
Univ. of Western Ontario (Canada)
Jeffrey J. L. Carson, Lawson Health Research Institute, St. Joseph's Health Care (Canada)
Univ. of Western Ontario (Canada)


Published in SPIE Proceedings Vol. 6856:
Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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