Spatial coding with curved wavefronts

Roger Zemp, Michael F. Insana

Research output: Contribution to journalConference articlepeer-review


Curved wavefronts of unfocused beams can be viewed as spatial codes that can be decoded to produce high quality images. The decoding process can be performed by spatial matched or Wiener filtering methods that are a generalization of synthetic receive processing for large apertures rather than small elements. Advantages of this technique over dynamic receive processing include potentially greater echo signal-to-noise and improved spatial resolution. An analytical treatment of weakly focused, Gaussian apodized beams shows that the spatial bandwidth is approximately constant with depth. Experiments and simulations illustrate the efficacy of spatial coding.

Original languageEnglish (US)
Article numberU2-K-1
Pages (from-to)1258-1261
Number of pages4
JournalProceedings - IEEE Ultrasonics Symposium
StatePublished - 2004
Externally publishedYes
Event2004 IEEE Ultrasonics Symposium - Montreal, Que., Canada
Duration: Aug 23 2004Aug 27 2004


  • Coded excitation
  • Ideal observer
  • Image quality
  • Nearfield
  • Speckle
  • Synthetic aperture

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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