NDLI: Aberration correction with OFF: the overdetermined, fan-filtering algorithm

Content Provider	IEEE Xplore Digital Library
Author	Haun, M.A. Jones, D.L. O'Brien Jr., W.D.
Copyright Year	2003
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA (Haun, M.A.; Jones, D.L.; O'Brien, W.D., Jr.)
Abstract	As medical ultrasound imaging moves to larger apertures and higher frequencies, tissue sound-speed variations continue to limit resolution. In geophysical imaging, a standard approach for estimating near-surface aberrating delays is to analyze the time shifts between common-midpoint signals. This requires the collection of complete data - echoes from every combination of an individual source and receiver. Unfocused, common-midpoint signals remain highly correlated in the presence of aberration; there is also tremendous redundancy in the data. In medical ultrasound, this technique has been severely impaired by the wide-angle, random scattering nature of tissue. Until now, it has been difficult to estimate azimuth dependent aberration profiles or to harness the full redundancy in the complete data. Prefiltering the data with two-dimensional fan filters largely solves these problems, permitting highly overdetermined, least-squares solutions for the aberration profiles at many steering angles. In experiments with a tissue-mimicking phantom target and silicone rubber aberrators at non-zero stand-off distances from a 1-D array transducer, this overdetermined, fan-filtering algorithm (OFF) significantly outperformed other published algorithms.
Starting Page	1231
Ending Page	1234
File Size	402459
Page Count	4
File Format	PDF
ISBN	0780379225
DOI	10.1109/ULTSYM.2003.1293124
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Biomedical imaging High-resolution imaging Delay estimation Acoustic imaging Apertures Frequency Image resolution Signal resolution Delay effects
Content Type	Text
Resource Type	Article

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