Title :
Aberration measurement and correction with a high resolution 1.75D array
Author :
Fernandez, Anna T. ; Dahl, Jeremy J. ; Dumont, Douglas M. ; Trahey, Gregg E.
Author_Institution :
Dept. of Biomed. Eng., Durham Univ., UK
Abstract :
Accurate measurement of tissue induced aberrations is necessary for effective adaptive ultrasound imaging. We acquired single channel RF data on a 6.7 MHz, 8×128 array (Tetrad Co.) operating at F/1.0 in azimuth and F/2.89 in elevation. This array was interfaced to a Siemens Elegra scanner, allowing for data acquisition during routine clinical scanning. Breast images in three patients and four volunteers (for a total of 16 scans), and thyroid and liver images in six volunteers (10 scans each) were taken. A least squares algorithm was employed to estimate the arrival time error induced by the tissue and to generate corrected images. In general, mild (20-40 nsec r.m.s.) and spatially stable aberration profiles were measured
Keywords :
aberrations; biological tissues; biomedical ultrasonics; least squares approximations; ultrasonic arrays; 6.7 MHz; RF signal; Siemens Elegra scanner; aberration correction; aberration measurement; adaptive ultrasound imaging; breast; clinical scanning; data acquisition; high-resolution 1.75D array; least squares algorithm; liver; thyroid; tissue; Azimuth; Breast; Data acquisition; Error correction; High-resolution imaging; Least squares approximation; Liver; Radio frequency; Ultrasonic imaging; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.992002
