Mr. Shuai Feng Profile

Shuai Feng

at HeFei University of Technology

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Publications (4)

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Proceedings Article | 13 November 2019 Paper

Ultrasound Doppler signal simulation based on wavefront propagation

Yongmei Wei, Hu Peng, Shuai Feng

Proceedings Volume 11343, 113431J (2019) https://doi.org/10.1117/12.2548732

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Ultrasound Doppler blood flow measurement is to measure the velocity of blood flow through the frequency shift characteristics of Doppler signal. It has the advantages of high sensitivity, non-invasive, strong direction and simple operation. The simulation of ultrasonic Doppler signal is an important aspect in the research field of ultrasonic Doppler signal. Computer simulation of Doppler signal can be used to evaluate the accuracy of Doppler velocity measurement method in early stage. It is an effective way to improve the accuracy of Doppler velocity measurement. Generally speaking, the theoretical model of the existing simulation method is relatively complex and the calculation amount is large. In this paper, a relatively simple simulation algorithm is proposed to simulate the Doppler echo signal in time and space domain. This method is based on the physical concept of wave front propagation. According to the time of moving object passing through two adjacent wave front with the same phase, the relationship between Doppler signal data and primary ultrasonic signal data is determined. The Doppler signal data is established by extracting the data of the primary transmitted ultrasound signal. A simple, efficient and intuitive simulation algorithm of Doppler echo signal is realized. The experimental results show that the simulation results are consistent with the theoretical calculation. It can more intuitively simulate the characteristics of real Doppler signals, accurately simulate continuous wave Doppler signals and pulse wave Doppler signals, and provide an effective and reliable signal source for Doppler signal analysis and processing methods.

Proceedings Article | 13 November 2019 Paper

Non-diffraction bessel wave simulation based on angular spectrum concept

Yongmei Wei, Hu Peng, Shuai Feng

Proceedings Volume 11343, 113431D (2019) https://doi.org/10.1117/12.2548712

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Bessel wave is a kind of non-diffraction wave in many types of ultrasonic field. In theory, it can propagate infinitely far without divergence. The non-diffraction characteristics of Bessel wave make it have potential application value. To quantitatively study Bessel wave, first of all, we need to calculate and analyze its sound field. There are many simulation methods, such as Rayleigh Sommerfeld method, finite difference time domain algorithm and so on. Generally speaking, these methods are time-consuming, computational complexity and low accuracy. In this paper, a simple method is proposed to simulate Bessel sound field by using the concept of angular spectrum. Firstly, the original angular spectrum is obtained by Fourier transform of the sound field distribution on the sensor boundary. Then, the angular spectrum distribution on any other plane perpendicular to the direction of sound field propagation is calculated according to the principle of angular spectrum propagation. Then, the field distribution on the plane can be obtained by inverse Fourier transform, and all the fields perpendicular to the direction of sound field propagation can be obtained. The results of the whole sound field distribution can be obtained by combining the field distribution of the plane. The simulation results of different methods show that this method has fast calculation speed and high simulation accuracy due to the introduction of Fourier transform. It can not only simulate Bessel sound field effectively, but also simulate other types of sound field. Therefore, the work of this paper has a certain significance for the study of non-diffraction sound field.

Proceedings Article | 13 November 2019 Paper

A novel method for broadband ultrasonic attenuation measurement in calcaneal quantitative ultrasound system

S. Feng, H. Y. Qiao, H. Peng

Proceedings Volume 11343, 113431M (2019) https://doi.org/10.1117/12.2548750

KEYWORDS: Ultrasonics, Bone, Signal attenuation, Ultrasonography, Calibration, Amplifiers, Signal processing, Tissues, Precision measurement, Dual energy x-ray absorptiometry

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Quantitative ultrasound (QUS) methods have been introduced in recent years for the assessment of skeletal status in osteoporosis. As an important parameter of QUS, broadband ultrasonic attenuation (BUA) has been clinically validated in terms of prediction of hip fracture risk. However, the short-term reproducibility of BUA has typically been inferior to that of dual-energy X-ray absorptiometry (DXA). Poor precision estimates may reduce the ability to detect longitudinal changes in BUA or the ability of QUS to assess response to therapy. In this paper, a new method for BUA measurement is proposed. In this method, an ultrasound signal covering range of frequencies (broadband) is passed through a patient’s heel to determine the BUA index. The amplitude spectrum of the received signal is then compared to the spectrum of a standard ultrasound bone phantom. The difference between the two spectra is then plotted against frequency, giving a straight line graph, the slope of which is the BUA index dB/MHz. The method eliminates the influence of water, fat and amplitudefrequency error, and improves the precision of BUA measurement, which is validated in 508 women ranging in age from 21 to 80 in vivo. Each subject was examined in two different methods, with foot repositioning before each examination. Precision was evaluated by calculating the coefficient of variation(CV). The CVs for the measurements reduced from 4.45% to 1.5%, which shows that our method effectively improve the precision of BUA measurement.

Proceedings Article | 26 January 2016 Paper

The discussion of integer coefficients comb filter to suppress power frequency interference

Y. F. Zuo, S. Feng, H. Peng, H.F. Kong, H.Y. Qiao

Proceedings Volume 9903, 99032G (2016) https://doi.org/10.1117/12.2216578

KEYWORDS: Computer programming, Linear filtering, Digital filtering, Electronic filtering, Microcontrollers, Particle filters, Embedded systems, Signal attenuation, Magnetism, Power supplies

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As the equipment based on Embedded Systems always runs into the interference of 50Hz frequency signal, we usually adopt digital filters to filter 50Hz frequency signal and reserve useful signals. But in order to meet the requirements for real-time processing, we hope the transfer function of the filter will be as simple as possible and the coefficient is integer. This article discusses the design methods of integer coefficients comb filter and gives out two integer coefficients comb filters which meet the requirements for real-time processing.

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