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A new technique for adaptive imaging in the presence of distributed aberrations

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4 Author(s)
Ng, G.C. ; Dept. of Biomed. Eng., Duke Univ., Durham, NC, USA ; Freiburger, P.D. ; Walker, W.F. ; Trahey, G.E.

Acoustic velocity inhomogeneities in tissue result in aberration of ultrasonic images. These aberrations can be modeled as a near field thin phase screen or as a distributed aberrator. Current techniques for the correction of distributed aberrators are limited to application on point targets. A new technique is proposed using multiple transmits from spatially shifted transmit apertures, called translating transmit apertures, which can remove the decorrelation of speckle with receiver position. Translating transmit apertures, when used in conjunction with phase conjugate filters, can correct for distributed aberrations in the presence of speckle targets

Published in:

Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE  (Volume:2 )

Date of Conference:

7-10 Nov 1995