NDLI: Elastogram estimation using adaptive-length Savitzky-Golay digital differentiators

Content Provider	IEEE Xplore Digital Library
Author	Shengzhen Tao Jinhua Shao Xinjian Zhu Jing Bai
Copyright Year	2011
Description	Author affiliation: Department of Biomedical Engineering, Tsinghua University, Beijing, 100084, China (Shengzhen Tao; Jinhua Shao; Xinjian Zhu; Jing Bai)
Abstract	Studies have shown that the Savitzky-Golay digital differentiator (SGDD) is a promising technique in elastography due to its ability in reducing elastogram noises and enhancing the contrast-to-noise ratio between lesion and background tissue. The performance of SGDD is mainly determined by its length/order. Usually, the proper differentiator length is determined as the one providing the maximum contrast between lesions and background tissues. Generally, long SGDDs reduce noise in uniform-strain regions more effectively, and can therefore improve lesion-detection ability. However, they may also lead to bias in regions of abrupt strain changes and finally limit the enhancement to contrast. Therefore, it will be advantageous to determine differentiator length according to local properties of elastograms. In this study, we propose a method to adaptively select proper SGDD length according to local properties of displacement estimates. Simulation experiments show that this method tends to select long SGDDs in regions of uniform strains, and prefers short SGDDs in regions presenting abrupt strain changes. Finally, the limitation to contrast induced by over-smoothing of single length SGDD can be overcome, and further enhancement to contrast is provided.
Starting Page	1089
Ending Page	1092
File Size	746636
Page Count	4
File Format	PDF
ISBN	9781424493517
e-ISBN	9781424493524
DOI	10.1109/BMEI.2011.6098389
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-15
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Savitzky-Golay digital differentiator Smoothing methods Ultrasonic imaging strain calculation Noise Fitting Imaging Lesions ultrasound elastography elastogram Strain adaptive order
Content Type	Text
Resource Type	Article

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