Mode scanning for ultrasound phased arrays with six planes of symmetry

Authors

  • Duo Chen Dept. of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824
  • Robert J. McGough Dept. of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824

Keywords:

Acoustic arrays, Error analysis, Gain control, Heating, Optimization, Pressure effects, Scanning, Mode scanning, Symmetric focal patterns, Symmetric planar arrays, Ultrasound phased array

Abstract

Modes are symmetric focal patterns that exploit the symmetry of ultrasound phased arrays and cancel the complex pressure field in multiple planes that contain the central axis. The mode scanning approach, which was originally derived for symmetric planar arrays populated with rectangular elements, is extended to include triangular and hexagonal elements. This focusing method is very useful for generating heating patterns in hyperthermia. An example of mode scanning with 6-fold symmetry shown for a flat, two-dimensional ultrasound phased array populated with equilateral triangles. The pressure field of a single triangular element is computed with the fast nearfield method, which generates pressure fields with relatively small errors. The derivation of the element driving signals that produce different model focal patterns for any mode combines the characteristic of geometric symmetry with the method of gain maximization.

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Published

2005-09-01

How to Cite

1.
Chen D, McGough RJ. Mode scanning for ultrasound phased arrays with six planes of symmetry. Canadian Acoustics [Internet]. 2005 Sep. 1 [cited 2021 Oct. 19];33(3):90-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1759

Issue

Section

Proceedings of the Acoustics Week in Canada