کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1759709 | 1019293 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Denoising of quadrature ultrasound Doppler signal from bi-directional flow based on matching pursuit
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
آکوستیک و فرا صوت
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![عکس صفحه اول مقاله: Denoising of quadrature ultrasound Doppler signal from bi-directional flow based on matching pursuit Denoising of quadrature ultrasound Doppler signal from bi-directional flow based on matching pursuit](/preview/png/1759709.png)
چکیده انگلیسی
Denoising of Doppler signal is a preliminary and important step in medical ultrasound imaging. To denoise quadrature Doppler signal from bi-directional flow, we propose a novel method based on matching pursuit in this paper. The proposed method is an iterative decomposition algorithm which decomposes the original Doppler signal into a linear expansion of atoms in a time-frequency dictionary. The time-frequency dictionary is similar to Fourier transform domain and the atoms are similar to orthogonal bases in Fourier transform. In each step of the iteration, the atom which gives the largest inner product with the analyzed signal is selected from the dictionary, and the contribution of this atom is subtracted from the Doppler signal. This process is repeated on the residue until the SNR reaches the maximum. The linear expansion of the selected atoms is the denoised signal. Simulations were conducted on a simulation model with a sampling rate of 12.8Â kHz. When the original SNRs are 0Â dB, 2Â dB, 4Â dB, 6Â dB, 8Â dB, 10Â dB, the proposed method can improve the SNR for 7.9Â dB, 7.8Â dB, 7.5Â dB, 7.3Â dB, 7.05Â dB, 6.8Â dB respectively, reduce the root mean square error (RMSE) of the mean frequency waveform to 0.0441Â kHz, 0.0303Â kHz, 0.0245Â kHz, 0.0215Â kHz, 0.0161Â kHz, 0.0125Â kHz respectively, and suppress the RMSE of the spectral width waveform to 0.1774Â kHz, 0.0591Â kHz, 0.0486Â kHz, 0.0170Â kHz, 0.0145Â kHz, 0.0117Â kHz respectively. Preliminary in vivo evaluation was also carried out on a healthy 33-year-old male using B-K medical A/S 3535 ultrasound scanner, and the results showed that the proposed method can effectively enhance the Doppler spectrogram.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 49, Issue 1, January 2009, Pages 19-25
Journal: Ultrasonics - Volume 49, Issue 1, January 2009, Pages 19-25
نویسندگان
Yining Zheng,