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Estimation of side lobes in ultrasound imaging systems

Biomedical Engineering Letters : Volume 5, Issue 2, June 2015

Biomedical Engineering Letters : Volume 5, Issue 1, March 2015

Biomedical Engineering Letters : Volume 4

Biomedical Engineering Letters : Volume 3

Biomedical Engineering Letters : Volume 2

Biomedical Engineering Letters : Volume 1

Estimation of side lobes in ultrasound imaging systems

Content Provider	Springer Nature Link
Author	Jeong, Mok Kun Kwon, Sung Jae
Copyright Year	2015
Abstract	We propose a new method of estimating the side lobe levels from received ultrasound channel data.Ultrasound signals impinging on an array transducer manifest themselves as sinusoids whose spatial frequency varies as a function of the incident angle. The received channel data from the main lobe direction have a spatial frequency of zero when considered across all the channels because individual channel data have the same phase in the temporal domain, while those from the side lobe directions have a spatial frequency that is not zero and varies with the ultrasound beam incident direction. Thus, the received channel data can be modeled as a sinusoidal waveform that has a specific frequency depending on the incident angle. The side lobe components are modeled as a sum of sinusoidal waves that have a frequency equal to an integer plus a half. We estimated the side lobe waveform that has an integer-plus-a-half frequency by adaptively varying the window length in the spectrum estimation. The effect of side lobes on ultrasound image can be reduced by subtracting the estimated side lobe waveform in receive focusing.To confirm the efficacy of the proposed method, ultrasound field simulations and experiments were carried out. We observed that the 1st to 5th spatial frequency side lobes estimated using the proposed method were present at the same positions as the side lobes in the field response. By subtracting the waveforms of the 1st to 20th spatial frequency side lobes, we reduced the side lobe levels by up to 14 dB. Experiments on wire phantoms in a water tank also confirmed that the proposed method can estimate and reduce the side lobe levels.We have proposed a new method of estimating and canceling side lobes that is validated through both simulation and experiment.
Starting Page	229
Ending Page	239
Page Count	11
File Format	PDF
ISSN	20939868
Journal	Biomedical Engineering Letters
Volume Number	5
Issue Number	3
e-ISSN	2093985X
Language	English
Publisher	The Korean Society of Medical and Biological Engineering
Publisher Date	2015-10-18
Publisher Place	Korea
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discrete Fourier transform Side lobe estimation Spatial frequency Suppression Ultrasound imaging Biomedical Engineering Biophysics and Biological Physics Biomedicine general Medical and Radiation Physics
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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