Phase Aberration Correction and Motion Compensation for Ultrasonic Hyperthermia Phased Arrays: Experimental Results

Hong Wang, Emad S. Ebbini, M. O'Donnell, Charles A. Cain

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

In ultrasound hyperthermia, focal patterns generated by phased arrays can be degraded by phase errors due to tissue inhomogeneities, digitization of the driving signals, and imperfect fabrication of the transducers. the degree of degradation depends on the severity of phase aberrations. As predicted by simulation and verified by experimental results, focal degradation scales. with, the circular variance of phase errors, However, degraded power deposition patterns can be significantly improved after phase aberration correction, especially where patterns are complicated and the aberrations are severe. Also, as shown in motion compensation experiments, an aberration corrected pattern can be particularly sensitive to aberrator movement greater than the correlation length of the aberrator. After motion compensation, new sharply focused patterns can be accomplished, thus reducing the unwanted influence of “body” movement by stabilizing the positions of foci with respect to patient anatomy.

Original languageEnglish (US)
Pages (from-to)34-43
Number of pages10
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume41
Issue number1
DOIs
StatePublished - Jan 1994

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