NDLI: P3A-4 Compounding of Strain Data Non-Invasively Obtained at Large Beam Steered Angles

Content Provider	IEEE Xplore Digital Library
Author	Hansen, H.H.G. Lopata, R.G.P. de Korte, C.L.
Copyright Year	2007
Description	Author affiliation: Radboud Univ. Nijmegen Med. Centre, Nijmegen (Hansen, H.H.G.; Lopata, R.G.P.; de Korte, C.L.)
Abstract	Non-invasive vulnerable plaque detection is beneficial for prevention of stroke and myocardial infarction. A recent study [1] has shown, that non-invasive vulnerable plaque detection in the carotid arteries is feasible by ultrasound elastography. However, the quality of the strain images is low, because contrary to intravascular strain imaging, lateral strain input is required for reconstructing radial and circumferential strain images. This study focuses on reducing the distortion caused by the lateral component by constructing radial and circumferential strain images from mainly axial strain data acquired at multiple insonification angles. Beam steering techniques [2] were applied to achieve insonification angles of up to 45deg. Most of the compound radial and circumferential strain images were estimated by projecting axial strain data in radial direction. A segment calculated by principal component analysis was added to obtain full 360deg compound strain images. Compound radial and circumferential strain images were constructed for three gelatin vessel phantoms; a homogeneous phantom with a concentric lumen, a homogeneous phantom with an eccentric lumen, and a heterogeneous phantom with an eccentric soft plaque. Three radial and circumferential strain images were constructed for the concentric phantom. The first was constructed by principal component analysis of 0deg data only. The second consisted of data obtained at -45, 0 and 45 degrees beam steering, and the third was made up of data acquired at -45, -30, -22, -15, 0, 15, 22, 30, and 45 degrees beam steering. Assuming a radial strain decay, elastographic signal-to-noise ratio's $(SNR_{e}),$ and contrast-to-noise ratio's $(CNR_{e})$ of these images were determined and compared. Finally, compound radial and circumferential strain images of the two eccentric phantoms were constructed from data acquired at the complete range of insonification angles, and compared. The image quality of the radial and circumferential compound strain images improved considerably compared to the radial and circumferential strain image constructed from 0deg information only. $SNR_{e}$ and $CNR_{e},$ increases of up to 4.4 dB and 9.9 dB were measured respectively. Image quality of the elastogram improved with the number of beam steered angles used for the compounding. By comparing the strain images of the two eccentric phantoms the soft plaque region could be identified.
Starting Page	1720
Ending Page	1723
File Size	529529
Page Count	4
File Format	PDF
ISBN	9781424413836
ISSN	10510117
DOI	10.1109/ULTSYM.2007.433
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-28
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitive sensors Imaging phantoms Beam steering Ultrasonic imaging Principal component analysis Image quality Myocardium Carotid arteries Image reconstruction Image segmentation
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

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