Minimum variance beamformer applied to frequency components of the RF signal of the eye: Enhancing the image quality of curved interfaces

Hirofumi Taki, Alfred C.H. Yu, Billy Y.S. Yiu, Hiroshi Kanai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Minimum variance beamformer has high potential in improving image quality through an adaptive apodization weight optimization approach, but its impact is conventionally limited to lateral resolution enhancements. Recently, we reported a high range resolution technique that applies minimum variance beamformer to the frequency components of the RF signal after a delay-and-sum process. The technique has high performance in the improvement of the range resolution when a target has flat interfaces, such as a longitudinal section of an artery. In the present study, we report further advance of this technique to enhance image quality of a normal swine eye whose anatomy is marked by multiple layers of curved interfaces. The reference signal is acquired by the coherent integration of the echoes from isolated interfaces to take account of the attenuation and the interface shape. The proposed technique succeeded to offer a sharp rendering of the cornea boundaries of the swine eye, where the center frequency of the transmit ultrasound pulse was 12 MHz. Computationally, it required 5 seconds using a laptop PC with a single CPU for the depiction of an image in the ROI that consists of 422,528 pixels. We reckon that, if the proposed technique is implemented using GPUs, high-quality images of the eye (with both lateral and range resolution enhancements) can be readily achieved in real time.

Original languageEnglish
Title of host publication2016 IEEE International Ultrasonics Symposium, IUS 2016
PublisherIEEE Computer Society
ISBN (Electronic)9781467398978
DOIs
Publication statusPublished - 2016 Nov 1
Event2016 IEEE International Ultrasonics Symposium, IUS 2016 - Tours, France
Duration: 2016 Sep 182016 Sep 21

Publication series

NameIEEE International Ultrasonics Symposium, IUS
Volume2016-November
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Other

Other2016 IEEE International Ultrasonics Symposium, IUS 2016
CountryFrance
CityTours
Period16/9/1816/9/21

Keywords

  • adaptive beamforming
  • curved interface
  • frequency domain interferometry
  • minimum variance beamformer
  • ultrasonography

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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