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논문 기본 정보

자료유형
학술저널
저자정보
정목근 (대진대학교) 권성재 (대진대학교)
저널정보
대한의용생체공학회 Biomedical Engineering Letters (BMEL) Biomedical Engineering Letters (BMEL) Vol.5 No.3
발행연도
2015.1
수록면
229 - 239 (11page)

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Purpose We propose a new method of estimating the sidelobe levels from received ultrasound channel data. Methods Ultrasound signals impinging on an array transducermanifest themselves as sinusoids whose spatial frequencyvaries as a function of the incident angle. The receivedchannel data from the main lobe direction have a spatialfrequency of zero when considered across all the channelsbecause individual channel data have the same phase in thetemporal domain, while those from the side lobe directionshave a spatial frequency that is not zero and varies with theultrasound beam incident direction. Thus, the receivedchannel data can be modeled as a sinusoidal waveform thathas a specific frequency depending on the incident angle. The side lobe components are modeled as a sum ofsinusoidal waves that have a frequency equal to an integerplus a half. We estimated the side lobe waveform that has aninteger-plus-a-half frequency by adaptively varying thewindow length in the spectrum estimation. The effect of sidelobes on ultrasound image can be reduced by subtracting theestimated side lobe waveform in receive focusing. Results To confirm the efficacy of the proposed method,ultrasound field simulations and experiments were carriedout. We observed that the 1st to 5th spatial frequency sidelobes estimated using the proposed method were present atthe same positions as the side lobes in the field response. Bysubtracting the waveforms of the 1st to 20th spatialfrequency side lobes, we reduced the side lobe levels by upto 14 dB. Experiments on wire phantoms in a water tank alsoconfirmed that the proposed method can estimate and reducethe side lobe levels. Conclusions We have proposed a new method of estimatingand canceling side lobes that is validated through bothsimulation and experiment.

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