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Proceedings Paper

Waveform synthesis for the design and image reconstruction of step FMCW ultrasound imaging systems with conformal transducer arrays
Author(s): Michael Lee; Rahul S. Singh; Martin O. Culjat; Shyam Natarajan; Brian P. Cox; Elliott R. Brown; Warren S. Grundfest; Hua Lee
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Paper Abstract

In this paper, we present the image reconstruction algorithm developed for a conformal ultrasound array imaging system operating in the step frequency-modulated continuous wave (FMCW) mode. The image formation procedure is based on a key relationship that establishes the equivalence between pulse-echo and step FMCW modalities, and thus permits conversion between the data types. Prior step FMCW simulation work could then be merged with pulse-echo data collected experimentally to achieve full-scale synthesis between laboratory data and a structured theoretical framework. We describe how an experimentally acquired pulse-echo waveform was extracted and incorporated into a step FMCW imaging simulation to increase image accuracy and improve visualization of physical effects. With knowledge of the transducer element positions in a multistatic configuration, image reconstruction was achieved by mapping the complex range profiles over to a target region. Included in this paper are images reconstructed after waveform synthesis, which feature transducer elements uniformly spaced around a circular aperture imaging several enclosed targets with different bandwidths.

Paper Details

Date Published: 13 March 2009
PDF: 12 pages
Proc. SPIE 7265, Medical Imaging 2009: Ultrasonic Imaging and Signal Processing, 72650C (13 March 2009); doi: 10.1117/12.812206
Show Author Affiliations
Michael Lee, Univ. of California, Los Angeles (United States)
Rahul S. Singh, Univ. of California, Los Angeles (United States)
Univ. of California, Santa Barbara (United States)
Martin O. Culjat, Univ. of California, Los Angeles (United States)
Univ. of California, Santa Barbara (United States)
Shyam Natarajan, Univ. of California, Los Angeles (United States)
Brian P. Cox, Univ. of California, Los Angeles (United States)
Elliott R. Brown, Univ. of California, Los Angeles (United States)
Univ. of California, Santa Barbara (United States)
Warren S. Grundfest, Univ. of California, Los Angeles (United States)
Hua Lee, Univ. of California, Los Angeles (United States)
Univ. of California, Santa Barbara (United States)


Published in SPIE Proceedings Vol. 7265:
Medical Imaging 2009: Ultrasonic Imaging and Signal Processing
Stephen A. McAleavey; Jan D'hooge, Editor(s)

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