Influence of missing array elements on phase aberration correction for medical ultrasound

Author

Karman, M. ; Köymen, Hayrettin ; Atalar, Abdullah ; O´Donnell, Matthew

Author_Institution

Dept. of Electr. & Electron. Eng., Bilkent Univ., Ankara, Turkey

Volume

41

Issue

5

fYear

1994

Firstpage

613

Lastpage

620

Abstract

The influence of missing array elements on aberration correction based on time delay estimation using radio frequency signals of neighboring elements is experimentally investigated. Normalized cross correlation and sum of absolute differences are employed as the cost functions in aberration estimation. Their performance is tested through various measurements using radio frequency data acquired with a 3.3 MHz, 64-element phased array. Variation of cost functions and phase estimation error are obtained for different combinations of number of missing elements, amount of aberration, and noise level. For a particular combination of these parameters, a set of B-scan images is reconstructed and presented to examine the effects of residual phase errors on image quality.<>

Keywords

aberrations; acoustic noise; antenna phased arrays; biomedical ultrasonics; correlation methods; measurement errors; 3.3 MHz; 64-element phased array; B-scan images; RF signal processing; aberration estimation; acoustic imaging; cost functions; image quality; image reconstruction; medical ultrasound; missing array elements; neighboring elements; noise level; normalized cross correlation; phase aberration correction; phase estimation error; radio frequency data; radio frequency signals; residual phase errors; sum of absolute differences; time delay estimation; Cost function; Delay effects; Delay estimation; Frequency estimation; Frequency measurement; Phase measurement; Phased arrays; RF signals; Radio frequency; Testing;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.308496

Filename

308496