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Proceedings Paper

New adaptive beamforming with spatially-smoothed coherence factor: simulation and ex vivo experiment results
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Paper Abstract

In photoacoustic imaging, an adaptive beamforming method with coherence factor (ABF-CF) was previously introduced for improving spatial resolution and signal-to-noise ratio (SNR) over a conventional delay-and-sum beamforming method (DAS). However, the ABF-CF method is not suitable for being used in practical diagnosis since it is overly-sensitive for off-axis interferences and noises. In this paper, a new adaptive beamforming method with spatially-smoothed coherence factor (ABF-SSCF) is presented for ultrasound and photoacoustic combined imaging to enhance the contrast and spatial resolution while preserving the target information by applying a spatial-smoothing technique into CF coefficients from multiple sub-arrays within an array probe. To evaluate the ABF-SSCF method, computer simulation and ex vivo experiments were conducted. For the computer simulation, 64-channel radio-frequency (RF) data with one channel amplitude-varying off-axis interference was generated. Also, The ex vivo experiments were conducted where 128-channel pre-beamformed RF data were captured from a microcalcification-contained breast core specimen with a commercial ultrasound system equipped with a research package by using a 7-MHz linear array probe (SonixTouch, Ultrasonix Corp., BC, Canada) and an Nd:Yag laser excitation system (Surelite III-10 and Surelite OPO Plus, Continuum Inc., Santa Clara, CA, USA). From the simulation and ex vivo experiments, the proposed ABF-SSCF method provides better contrast and spatial resolutions comparable than the DAS method. Also, compared to the ABFCF method, image information is clearly presented without being degraded by off-axis interferences. These results indicate that the proposed ABF-SSCF method can simultaneously enhance the image quality and efficacy of the ABF method for ultrasound and photoacoustic combined imaging.

Paper Details

Date Published: 23 February 2012
PDF: 10 pages
Proc. SPIE 8223, Photons Plus Ultrasound: Imaging and Sensing 2012, 82232X (23 February 2012); doi: 10.1117/12.907716
Show Author Affiliations
Jeeun Kang, Sogang Institute of Advanced Technology (Korea, Republic of)
Jin Ho Chang, Sogang Institute of Advanced Technology (Korea, Republic of)
Sogang Univ. (Korea, Republic of)
Yangmo Yoo, Sogang Univ. (Korea, Republic of)
Tai-Kyong Song, Sogang Institute of Advanced Technology (Korea, Republic of)
Sogang Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8223:
Photons Plus Ultrasound: Imaging and Sensing 2012
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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