NDLI: A new synthetic aperture focusing method using nonspherical wave fronts

Content Provider	IEEE Xplore Digital Library
Author	Jin Ho Chang Jun Woo Park Tai-kyong Song
Copyright Year	2001
Description	Author affiliation: Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea (Jin Ho Chang)
Abstract	Conventional ultrasound focusing techniques suffer from poor lateral resolution due to the diffraction spreading of ultrasound waves. In this paper, we present a new two-way dynamic focusing method with limited diffraction properties. Specifically, the new method is a synthetic aperture focusing (SAF) method utilizing linear wave fronts for synthetic transmit focusing, instead of spherical wave fronts, to reduce the diffraction spreading effect. In the proposed method, data acquisition and beamforming are performed in the same manner as in other known SAF methods. The main difference is that for each firing all array elements are used to transmit a plane wave of which the traveling angle varies with the receive subaperture position. On receiving, each scan line is formed by synthesizing the relevant receive subaperture fields with delays to force the plane waves to meet at each imaging point. In this paper, the properties of the proposed scheme are theoretically analyzed with a hypothetical infinite line source that is used to transmit the plane waves. It is verified by computer simulation that the proposed scheme can be realized with a finite aperture and the resultant lateral beam pattern has smaller mainlobe widths than those of conventionally focused two-way beam pattern at all depths.
Sponsorship	Ultrasonics, Ferroelectr., & Frequency Control Soc
Starting Page	1525
Ending Page	1528
File Size	299715
Page Count	4
File Format	PDF
ISBN	0780371771
DOI	10.1109/ULTSYM.2001.992010
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-10-07
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Focusing Apertures Diffraction Ultrasonic imaging Data acquisition Array signal processing Propagation delay Computer simulation Radio frequency Fourier transforms
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in