Abstract
In the evaluation of cancellous bone using ultrasonic backscatter, the amplitude of the backscatter signal is usually quite weak and the signal-to-noise ratio (SNR) is relatively low. This study used the m-sequence as the excitation to enhance the intensity and the anti-noise performance of the backscatter signal. The minimum peak sidelobe (MPS) filter was used to decode the received backscatter signal. The finite-difference time-domain (FDTD) simulation results show that the amplitude of the backscatter signal gets an enhancement of approximately 3.6 times with m-sequence than the monopulse excitation, and the decoded signal is approximately 93.9% identical to the ideal response of monopulse excitation. When the SNR decreased, the correlation coefficient between the monopulse signal and the ideal response decreased significantly, while the correlation of the m-sequence response changed little and remained steady, proving that the m-sequence signal gets a very good anti-noise performance. In vitro experiments were performed with bovine cancellous bones. In vitro results showed that the amplitude of the backscatter signal get an enhancement of approximately 3.8 times with m-sequence than the monopulse excitation, and the decoded signal was 94.6% identical to the ideal response of monopulse excitation. This study suggested that the ultrasonic backscatter of m-sequence excitation could be used for cancellous bone evaluation.
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Acknowledgements
This work was supported by the NSFC (11327405, 11504057 and 11525416), Science and technology support program of Shanghai (13441901900), and China Postdoctoral Science Foundation (2015M571490).
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Xu, F., Liu, C., Ta, D. (2018). M-Sequence Excitation of Ultrasonic Backscatter Signals for Cancellous Bone Evaluation. In: Vo Van, T., Nguyen Le, T., Nguyen Duc, T. (eds) 6th International Conference on the Development of Biomedical Engineering in Vietnam (BME6) . BME 2017. IFMBE Proceedings, vol 63. Springer, Singapore. https://doi.org/10.1007/978-981-10-4361-1_7
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DOI: https://doi.org/10.1007/978-981-10-4361-1_7
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