Two-dimensional random arrays for real time volumetric imaging.

Published

Journal Article

Two-dimensional arrays are necessary for a variety of ultrasonic imaging techniques, including elevation focusing, 2-D phase aberration correction, and real time volumetric imaging. In order to reduce system cost and complexity, sparse 2-D arrays have been considered with element geometries selected ad hoc, by algorithm, or by random process. Two random sparse array geometries and a sparse array with a Mills cross receive pattern were simulated and compared to a fully sampled aperture with the same overall dimensions. The sparse arrays were designed to the constraints of the Duke University real time volumetric imaging system, which employs a wide transmit beam and receive mode parallel processing to increase image frame rate. Depth-of-field comparisons were made from simulated on-axis and off-axis beamplots at ranges from 30 to 160 mm for both coaxial and offset transmit and receive beams. A random array with Gaussian distribution of transmitters and uniform distribution of receivers was found to have better resolution and depth-of-field than both a Mills cross array and a random array with uniform distribution of both transmit and receive elements. The Gaussian random array was constructed and experimental system response measurements were made at several ranges. Comparisons of B-scan images of a tissue mimicking phantom show improvement in resolution and depth-of-field consistent with simulation results.

Full Text

Duke Authors

Cited Authors

  • Davidsen, RE; Jensen, JA; Smith, SW

Published Date

  • July 1994

Published In

Volume / Issue

  • 16 / 3

Start / End Page

  • 143 - 163

PubMed ID

  • 7839555

Pubmed Central ID

  • 7839555

Electronic International Standard Serial Number (EISSN)

  • 1096-0910

International Standard Serial Number (ISSN)

  • 0161-7346

Digital Object Identifier (DOI)

  • 10.1177/016173469401600301

Language

  • eng