A concave annular array design, based on phasor summation--Part II: Beam profiles and resultant images by B-scan and synthetic focus methods.
A brief review of the synthetic focusing method is given. The theoretical limit of resolution that may be achieved with the synthetic focusing methods is demonstrated using experimental results on a thin thread obtained with an annular array whose design was given in Part I. The advantage of large aperture arrays is illustrated by an in vitro reflection image of a dog artery, made with this array, that has at least four times the spatial resolution of present clinical B-scanners operating in the same frequency range.
Yuan
W Q
WQ
Department of Electrical Engineering, University of Utah, Salt Lake City 84112.
Johnson
S A
SA
Berggren
M J
MJ
Eidens
R S
RS
D000818:Animals; D001158:Arteries / Q000033:anatomy & histology; D004285:Dogs; D004867:Equipment Design; D007089:Image Enhancement / Q000295:instrumentation; D008962:Models, Theoretical; D014465:Ultrasonics; D014463:Ultrasonography / Q000295:instrumentation* / Q000379:methods