NDLI: High resolution depth-resolved imaging from multi-focal images for medical ultrasound

Content Provider	IEEE Xplore Digital Library
Author	Diamantis, K. Dalgarno, P.A. Greenaway, A.H. Anderson, T. Jensen, J.A. Sboros, V.
Copyright Year	2015
Description	Author affiliation: Sch. of Clinical Sci., Univ. of Edinburgh, Edinburgh, UK (Anderson, T.) \|\| IB3, UK (Dalgarno, P.A.; Greenaway, A.H.; Sboros, V.) \|\| Dept. of Electr. Eng., Tech. Univ. of Denmark, Lyngby, Denmark (Jensen, J.A.) \|\| Inst. of Biol. Chem., Biophys. & Bioeng., Heriot-Watt (HW) Univ., Edinburgh, UK (Diamantis, K.)
Abstract	An ultrasound imaging technique providing sub-diffraction limit axial resolution for point sources is proposed. It is based on simultaneously acquired multi-focal images of the same object, and on the image metric of sharpness. The sharpness is extracted by image data and presents higher values for in-focus images. The technique is derived from biological microscopy and is validated here with simulated ultrasound data. A linear array probe is used to scan a point scatterer phantom that moves in depth with a controlled step. From the beamformed responses of each scatterer position the image sharpness is assessed. Values from all positions plotted together form a curve that peaks at the receive focus, which is set during the beamforming. Selection of three different receive foci for each acquired dataset will result in the generation of three overlapping sharpness curves. A set of three calibration curves combined with the use of a maximum-likelihood algorithm is then able to estimate, with high precision, the depth location of any emitter fron each single image. Estimated values are compared with the ground truth demonstrating that an accuracy of 28.6 μm (0.13λ) is achieved for a 4 mm depth range.
Starting Page	7067
Ending Page	7070
File Size	602704
Page Count	4
File Format	PDF
ISSN	1557170X
e-ISBN	9781424492718
DOI	10.1109/EMBC.2015.7320020
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-08-25
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Image resolution Transducers Microscopy Accuracy Biology
Content Type	Text
Resource Type	Article
Subject	Signal Processing Biomedical Engineering Health Informatics Computer Vision and Pattern Recognition

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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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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