Retrospective dynamic transmit focusing
Journal
Ultrasonic Imaging
Journal Volume
17
Journal Issue
3
Pages
173-196
Date Issued
1995
Author(s)
Abstract
Dynamically-focused on receive, real-time array systems exhibit image degradation far from the focal zone of the fixed transmit lens. A retrospective filtering technique reducing the effects of the fixed transmitter is presented. The filter deconvolves the defocused transmit pattern producing a new in-focus transmit/receive image, where the filter coefficients are derived with a least-squares method. Experimental results are presented for a 128 channel array system showing the method's performance. A proposed architecture for real-time filtering is also discussed. © 1995, SAGE Publications. All rights reserved.
Subjects
Aperture function; beam pattern; image restoration; optimal filters; ultrasound
SDGs
Other Subjects
Image reconstruction; Least squares approximations; Ultrasonic applications; Ultrasonics; Aperture function; Beam pattern; Filter coefficients; Filtering technique; Least squares methods; Optimal filter; Proposed architectures; Real time filtering; Real time systems; echography; filter; image display; image reconstruction; mathematical analysis; review
Type
journal article