Waveform synthesis for the design and image reconstruction of step FMCW ultrasound imaging systems with conformal transducer arrays

Michael Lee; Rahul S. Singh; Martin O. Culjat; Shyam Natarajan; Brian P. Cox; Elliott R. Brown; Warren S. Grundfest M.D.; Hua Lee

doi:10.1117/12.812206

13 March 2009 Waveform synthesis for the design and image reconstruction of step FMCW ultrasound imaging systems with conformal transducer arrays

Michael Lee, Rahul S. Singh, Martin O. Culjat, Shyam Natarajan, Brian P. Cox, Elliott R. Brown, Warren S. Grundfest M.D., Hua Lee

Author Affiliations +

Proceedings Volume 7265, Medical Imaging 2009: Ultrasonic Imaging and Signal Processing; 72650C (2009) https://doi.org/10.1117/12.812206
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

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.

Citation Download Citation

Michael Lee, Rahul S. Singh, Martin O. Culjat, Shyam Natarajan, Brian P. Cox, Elliott R. Brown, Warren S. Grundfest M.D., and Hua Lee "Waveform synthesis for the design and image reconstruction of step FMCW ultrasound imaging systems with conformal transducer arrays", Proc. SPIE 7265, Medical Imaging 2009: Ultrasonic Imaging and Signal Processing, 72650C (13 March 2009); https://doi.org/10.1117/12.812206

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