NDLI: Optimization of transverse oscillating fields for vector velocity estimation with convex arrays

Content Provider	IEEE Xplore Digital Library
Author	Jensen, J.A.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. Eng., Tech. Univ. of Denmark, Lyngby, Denmark (Jensen, J.A.)
Abstract	A method for making Vector Flow Images using the transverse oscillation (TO) approach on a convex array is presented. The paper presents optimization schemes for TO fields for convex probes and evaluates their performance using Field II simulations and measurements using the SARUS experimental scanner. A 3 MHz 192 elements convex array probe (pitch 0.33 mm) is used in both simulations and measurements. An F-number of 5 is used in transmit and two 32 element wide peaks are used in receive separated by 96 elements between peaks. Parabolic velocity profiles are simulated at beam-to-flow angles from 90 to 45 degrees in steps of 15 degrees. The optimization routine changes the lateral oscillation period $λ_{x}$ to yield the best possible estimates based on the energy ratio between positive and negative spatial frequencies in the ultrasound field. The basic equation for $λ_{x}$ gives 1.14 mm at 40 mm, and 1.51 mm from the simulated point spread function. This results in a bias of 35% as $λ_{x}$ directly scales the estimated velocities. Optimizing the focusing yields a $λ_{x}$ of 1.61 mm. The energy ratio is reduced from -12.8 dB to -20.1 dB and the spectral bandwidth from 115.1 $m^{-1}$ to 96.5 $m^{-1}.$ $λ_{x}$ is maintained between 1.47 and 1.70 mm from 25 mm to 70 mm and is increased to 2.8 mm at a depth of 100 mm. Parabolic profiles are estimated using 16 emissions. The optimization gives a reduction in std. from 8.5% to 5.9% with a reduction in bias from 35% to 1.02% at 90 degrees (transverse flow) at a depth of 40 mm. Measurements have been made using the SARUS experimental ultrasound scanner and a BK Medical 8820e convex array transducer. Sixty-four elements was used in transmit and 2 × 32 elements in receive for creating a color flow map image of a flow rig phantom with a laminar, parabolic flow. At 75 degrees a bias of less than 1% was obtained.
Sponsorship	IEEE Ultrason., Ferroelectr., Freq. Control Society
Starting Page	1753
Ending Page	1756
File Size	240620
Page Count	4
File Format	PDF
ISSN	19485719
e-ISBN	9781467356862
DOI	10.1109/ULTSYM.2013.0447
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-21
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Oscillators Standards Vectors Optimization Ultrasonic imaging Focusing Estimation
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

Transverse oscillation vector velocity estimation using a phased array transducer

3D vector velocity estimation using a 2D phased array

Improved vector velocity estimation using Directional Transverse Oscillation

Measuring 3D velocity vectors using the Transverse Oscillation method

Transverse oscillations for phased array vector velocity imaging

Convex array vector velocity imaging using transverse oscillation and its optimization

3-D vector velocity estimation with row-column addressed arrays

Recent advances in blood flow vector velocity imaging

High frame rate vector velocity estimation using plane waves and transverse oscillation

Optimization of transverse oscillating fields for vector velocity estimation with convex arrays

Similar Documents

Transverse oscillation vector velocity estimation using a phased array transducer

3D vector velocity estimation using a 2D phased array

Improved vector velocity estimation using Directional Transverse Oscillation

Measuring 3D velocity vectors using the Transverse Oscillation method

Transverse oscillations for phased array vector velocity imaging

Convex array vector velocity imaging using transverse oscillation and its optimization

3-D vector velocity estimation with row-column addressed arrays

Recent advances in blood flow vector velocity imaging

High frame rate vector velocity estimation using plane waves and transverse oscillation

Optimization of transverse oscillating fields for vector velocity estimation with convex arrays