A high frequency synthetic ultrasound array incorporating an actuator

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

Research output: Contribution to journalConference article

9 Citations (Scopus)

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

Fingerprint

synthetic arrays
Ultrasound
Actuator
Synthetic apertures
Actuators
actuators
Ultrasonics
Imaging techniques
Optical transfer function
Composite materials
synthetic apertures
Transducers
Synthetic Aperture
Capacitance
Hardware
Bandwidth
Fabrication
echoes
Composite
Imaging

All Science Journal Classification (ASJC) codes

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

Cite this

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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.",
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A high frequency synthetic ultrasound array incorporating an actuator. / Ritter, T. A.; Shrout, Thomas R.; Shung, K. K.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4325, 01.01.2001, p. 36-46.

Research output: Contribution to journalConference article

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