Title :
Reduction of effects of inactive array elements in phase aberration correction [medical ultrasonics]
Author :
Karaman, Mustafa ; Koymen, Hayrettin ; Atalar, Abdullah ; O´Donnell, Matthew
Author_Institution :
Dept. of Electr. & Electron. Eng., Bilkent Univ., Ankara
fDate :
31 Oct-3 Nov 1993
Abstract :
Phase aberration correction based on time delay estimation via minimization of the sum of absolute difference (SAD) between the radio frequency (RF) signals of neighboring elements is studied in the presence of missing elements. To examine the influence of inactive elements, phase estimation error is measured for various combinations of different number of missing elements, aberration level, and SNR. The measurements are performed on an experimental RF data set. Aberration delays of missing elements are interpolated using the phase estimate between the nearest active elements. The B-scan images are reconstructed for qualitative examination
Keywords :
acoustic arrays; acoustic signal processing; biomedical ultrasonics; B-scan images; inactive array elements; phase aberration correction; phase estimation error; radio frequency signals; time delay; Delay effects; Delay estimation; Frequency estimation; Image reconstruction; Performance evaluation; Phase estimation; Phase measurement; Phased arrays; RF signals; Radio frequency;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339585
