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Proceedings Paper

A photoacoustic imaging system employing a curved-phased ultrasonic array and parallel electronics
Author(s): Anastasios Maurudis; Fei Huang; Puyun Guo; Shikui Yan; Diego Castillo; Lihong V. Wang; Quing Zhu
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Paper Abstract

Real-time photoacoustic imaging requires ultrasonic array receivers and parallel data acquisition systems for the simultaneous detection of weak photoacoustic signals. In this paper, we introduce a newly completed ultrasonic receiving array system and report preliminary results of our measured point spread function. The system employs a curved ultrasonic phased array consisting of 128-elements, which span a quarter of a complete circle. The center frequency of the array is 5 MHz and the bandwidth is greater than 60%. In order to maximize the signal-to-noise ratio for photoacoustic signal detection, we utilized special designs for the analog front-end electronics. First, the 128 transducer-element signals were routed out using a 50-Ohm impedance matching PCB board to sustain signal integrity. We also utilize 128 low-noise pre-amplifiers, connected directly to the ultrasonic transducer, to amplify the weak photoacoustic signals before they were multiplexed to a variable-gain multi-stage amplifier chain. All front-end circuits were placed close to the transducer array to minimize signal lose due to cables and therefore improve the signal-to-noise ratio. Sixteen analog-to-digital converters were used to sample signals at a rate of 40 mega-samples per second with a resolution of 10-bits per sample. This allows us to perform a complete electronic scan of all 128 elements using just eight laser pulses.

Paper Details

Date Published: 6 March 2006
PDF: 11 pages
Proc. SPIE 6086, Photons Plus Ultrasound: Imaging and Sensing 2006: The Seventh Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 60861Q (6 March 2006); doi: 10.1117/12.648500
Show Author Affiliations
Anastasios Maurudis, Univ. of Connecticut (United States)
Fei Huang, Univ. of Connecticut (United States)
Puyun Guo, Univ. of Connecticut (United States)
Shikui Yan, Univ. of Connecticut (United States)
Diego Castillo, Univ. of Connecticut (United States)
Lihong V. Wang, Texas A&M Univ. (United States)
Quing Zhu, Univ. of Connecticut (United States)

Published in SPIE Proceedings Vol. 6086:
Photons Plus Ultrasound: Imaging and Sensing 2006: The Seventh Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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