NDLI: Robust blood velocity estimation using point-spread-function-based beamforming and multi-step speckle tracking

Content Provider	IEEE Xplore Digital Library
Author	Saris, A.E.C.M. Nillesen, M.M. Fekkes, S. Hansen, H.H.G. de Korte, C.L.
Copyright Year	2015
Description	Author affiliation: Dept. of Radiol. & Nucl. Med., Radboud Univ. Med. center, Nijmegen, Netherlands (Saris, A.E.C.M.; Nillesen, M.M.; Fekkes, S.; Hansen, H.H.G.; de Korte, C.L.)
Abstract	Speckle tracking enables 2D blood velocity estimation; however, imaging at a high frame rate is crucial, since speckle quickly decorrelates due to high velocity gradients. Recently, ultrafast imaging has become possible, which allows imaging at very high frame rates. This improves the accuracy of high velocity blood flow estimation, but hinders the estimation of low velocities, since interframe displacements drop below the data sampling resolution. A lot of effort has already been put into the development of methods to estimate subsample displacements, but still it remains challenging. Ultrafast imaging provides the opportunity to generate ultrasound radio frequency (RF) data at any location covered by the transmit beam. In other words, the spatial sampling of the data can be reconsidered. In this work, a method is proposed which incorporates knowledge of the point spread function (PSF) of the imaging system into the data sampling grid, to improve subsample displacement estimation. By using the dimensions of the PSF to choose the data sampling grid, the peak in the cross-correlation function is captured in a standardized way, which facilitates an optimal match with a 2D cubic interpolation method. Performance of the new approach is evaluated based on simulated data from a carotid artery as well as on in vivo data from the common carotid artery of a healthy volunteer. For a large range of pulse repetition frequencies and beam-to-flow angles, simulation results showed improved performance with respect to results obtained using conventionally spaced RF and envelope data. These findings are corroborated by in vivo results, showing the most consistent flow using the proposed method.
Starting Page	1
Ending Page	4
File Size	1755813
Page Count	4
File Format	PDF
e-ISBN	9781479981823
DOI	10.1109/ULTSYM.2015.0421
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	Radio frequency Array signal processing Imaging Interpolation Estimation Speckle Accuracy beamforming Vector velocity imaging speckle tracking blood flow ultrafast imaging
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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