A high frequency synthetic ultrasound array incorporating an actuator

T. A. Ritter, T. R. Shrout, K. K. Shung

Research output: Contribution to journalConference article

10 Scopus citations

Abstract

Ultrasound imaging at frequencies above 20 MHz relies almost exclusively on single-element transducers. In order to apply array technology at these frequencies, several practical problems must be solved, including spatial scale and fabrication limitations, low device capacitance, and lack of a hardware beamformer. One method of circumventing these problems is to combine an array, an actuator, and a synthetic aperture software beamformer. The array can use relatively wide elements spaced on a coarse pitch. The actuator is used to move the array in short steps (less than the element pitch), and pulse-echo data is acquired at intermediate sample positions. The synthetic aperture beamformer reconstructs the image from the pulse-echo data. A 50 MHz example is analyzed in detail. Estimates of signal-to-noise reveal performance comparable to a standard phased array; furthermore, the actuated array requires half the number of elements, the elements are 8x wider, and only one channel is required. Simulated threedimensional point spread functions demonstrate side lobe levels approaching -40 dB and main beam widths of 50 to 100 microns. A 50 MHz piezo-composite array design has been tested which displays experimental bandwidth of 70% while maintaining high sensitivity. Individual composite sub-elements are 18 microns wide. Once this array is integrated with a suitable actuator, it is anticipated that a tractable method of imaging with high frequency arrays will result.

Original languageEnglish (US)
Pages (from-to)36-46
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4325
DOIs
StatePublished - Jan 1 2001
EventMedical Imaging 2001: Ultrasonic Imaging and Signal Processing - San Diego, CA, United States
Duration: Feb 21 2001Feb 22 2001

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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