Papers Published

1. Ng, G.C. and Freiburger, P.D. and Walker, W.F. and Trahey, G.E., A new technique for adaptive imaging in the presence of distributed aberrations, 1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.95CH35844), vol. vol.2 (1995), pp. 1455 - 9 [ULTSYM.1995.495830] .
   (last updated on 2007/04/13)

   Abstract:
   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

   Keywords:
   adaptive signal processing;biomedical ultrasonics;medical signal processing;speckle;ultrasonic velocity;