NDLI: Volumetric pulse echo and optoacoustic imaging by elaborating a weighted synthetic aperture technique

Content Provider	IEEE Xplore Digital Library
Author	Kalkhoran, M.A. Varray, F. Vallet, M. Vray, D.
Copyright Year	2015
Description	Author affiliation: INSA-Lyon, Univ. de Lyon, Lyon, France (Kalkhoran, M.A.; Varray, F.; Vallet, M.; Vray, D.)
Abstract	Integrating the ultrasonic pulse-echo (PE) and optoacousic (OA) imaging is a potent approach in rendering the volumetric images of biological tissues. The deliverable information are essentially uncorrelated but highly complementary in learning about the optical and mechanical properties of the medium. Yet, owing to the inhomogeneities in acoustic velocity and the optical scattering, this synergistic approach suffers from the low depth resolution, low contrast and artifacts like off-axis contributions and phase distortion. In this work, an adaptive weighted dynamic focusing based reconstruction technique namely, weighted synthetic aperture (WSA), has been developed to address the aforementioned defects, in particular for annular array. Our findings show the efficiency of WSA method in 3D reconstruction of simulated phantom. We elaborate WSA to estimate the spatial location, size, reflectivity function and absorption coefficient of the insonified/illuminated targets for both imaging modalities. The phase distortion introduced by the separable delay approximation is addressed with an adaptive weighting factor that combines coherence factor (CF) and phase coherence factor (PCF). In addition, the weighting factor incorporates the spatial impulse response (SIR), which is associated with the properties of the transducer in order to inverse the effect of the transducer on imaging quality. Using numerical phantom, the simulation results demonstrate that incorporating SIR into the weighting factor ensures the isotropic sensitivity while CF and PCF are suppressing the artifacts, grating lobe and phase aberration for both OA and PE images.
Starting Page	1
Ending Page	4
File Size	1606694
Page Count	4
File Format	PDF
e-ISBN	9781479981823
DOI	10.1109/ULTSYM.2015.0238
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-21
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transducers Imaging Apertures Image reconstruction Image resolution Acoustics Arrays array transducer Optoacoustic imaging ultrasound imaging 3D imaging beamforming
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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