Title :
Correlation-based aberration correction in the presence of inoperable elements
Author :
O´Donnell, Matthew ; Engeler, William E.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA
Abstract :
Estimation of phase aberrations using correlation processing between neighboring elements in a phased array is explored in the presence of inoperable elements. Using a CORDIC-based implementation of a complex baseband correlator, inactive elements can be identified simultaneous with correlation processing. Following detection of inoperable elements, a simple rerouting of the adaptive beam former is used to eliminate these elements from correlation analysis. Experimental results on a 3.33-MHz, 64-element array system with four contiguous, inactive elements demonstrate the robustness of the simple rerouting method for accurate phase aberration estimation.<>
Keywords :
acoustic imaging; acoustic signal processing; biomedical ultrasonics; medical image processing; 3.33 MHz; 64-element array; CORDIC-based implementation; aberration correction; accurate phase aberration estimation; adaptive beam former; complex baseband correlator; correlation processing; detection of inoperable elements; inactive elements; inoperable elements; phased array; rerouting method; robustness; Acoustic beams; Acoustic imaging; Correlators; Delay; Demodulation; Frequency conversion; Phase estimation; Phased arrays; Radio frequency; Ultrasonic imaging;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
