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논문 기본 정보

자료유형
학술저널
저자정보
Heechul Yoon (Samsung Electronics) Kang-won Jeon (Samsung Electronics) Hyuntaek Lee (Samsung Electronics) Kyeongsoon Kim (Inje University) Changhan Yoon (Inje University)
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.13 No.1
발행연도
2018.1
수록면
468 - 475 (8page)

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초록· 키워드

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In medical ultrasound imaging, frequency-dependent attenuation downshifts and reduces a center frequency and a frequency bandwidth of received echo signals, respectively. This causes considerable errors in quadrature demodulation (QDM), result in lowering signal-to-noise ratio (SNR) and contrast resolution (CR). To address this problem, adaptive dynamic QDM (ADQDM) that estimates center frequencies along depth was introduced. However, the ADQDM often fails when imaging regions contain hypoechoic regions. In this paper, we introduce a valid region-based ADQDM (VR-ADQDM) method to reject the misestimated center frequencies to further improve SNR and CR. The valid regions are regions where the center frequency decreases monotonically along depth. In addition, as a low-pass filter of QDM, Gaussian wavelet based dynamic filtering was adopted. From the phantom experiments, average SNR improvements of the ADQDM and the VR-ADQDM over the traditional QDM were 1.22 and 5.27 ㏈, respectively, and the corresponding maximum SNR improvements were 2.56 and 10.58 ㏈. The contrast resolution of the VR-ADQDM was also improved by 0.68 compared to that of the ADQDM. Similar results were obtained from in vivo experiments. These results indicate that the proposed method would offer promises for imaging technically-difficult patients due to its capability in improving SNR and CR.

목차

Abstract
1. Introduction
2. Method
3. Results and Discussion
4. Conclusion
References

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UCI(KEPA) : I410-ECN-0101-2018-560-001704950