Abstract
This study aimed at applying spectral methods and CWT in the periodicity characterization in simulated/backscattered A-mode ultrasound signals. The experimental setup used a transducer (7.5 MHz) on a pulse-echo configuration. A copper-rods phantom modeled a periodic scatterers pattern (diameter = 0.5 mm, spacing = 2.5 mm). The transducer was translated parallel to the phantom to collect signals. A-mode 7.5-MHz signals were also simulated using a numerical model with contributions from regular (MSS = 1 mm) and diffuse scatterers, with several levels of noises and jitters (variability on the expected scatterer positions). Experimental and simulated signals were processed with the spectral autocorrelation (SAC), singular spectrum analysis (SSA) and the quadratic transformation (Simon’s method) for MSS estimation, as well as the continuous wavelet transform with two mother-wavelets. MSS distributions are not similar in many noise-jitter situations, or when comparing the performance between two methods (p < 0.05). SAC was able to better characterize scatterer spacing. SIMON and CWT presented modes near 2.5 mm and 3.5 mm (the MSS and the diagonal distance of two rods). SSA may detect rods thicknesses (0.5 mm). CWT would fit for locating scatterer position.
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References
Mamou, J., Oelze, M.L.: Quantitative Ultrasound in Soft Tissues. Springer, New York (2013)
Machado, C.B., Pereira, W.C.A., Meziri, M., Laugier, P.: Characterization of in vitro healthy and pathological human liver tissue periodicity using backscattered ultrasound signals. Ultrasound Med. Biol. 32(6), 649–657 (2006)
Bouzitoune, R., Meziri, M., Machado, C.B., Padilla, F., Pereira, W.C.A.: Can early hepatic fibrosis stages be discriminated by combining ultrasonic parameters? Ultrasonics 68, 120–126 (2016)
Tang, X., Abeyratne, U.R.: Wavelet transforms in estimating scatterer spacing from ultrasound echoes. Ultrasonics 38, 688–692 (2000)
Zhou, Z., Sheng, L., Wu, S., Yang, C., Zeng, Y.: Ultrasonic evaluation of microwave-induced thermal lesions based on wavelet analysis of mean scatterer spacing. Ultrasonics 53, 1325–1331 (2013)
Percival, D.B., Walden, A.T.: Wavelet Methods for Time Series Analysis. Cambridge University Press, London (2000)
Pereira, W.C.A., Maciel, C.D.: Performance of ultrasound echo decomposition using singular spectrum analysis. Ultrasound Med. Biol. 27(9), 1231–1238 (2001)
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To CNPq, CAPES, FAPERJ, and Estácio de Sá University.
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Machado, C.B., Meziri, M., de A. Pereira, W.C., Cortela, G. (2019). Spectral Analysis Methods with Continuous Wavelet Transform to Characterize Media Periodicity Using Backscattered and Simulated Ultrasound Signals. In: Costa-Felix, R., Machado, J., Alvarenga, A. (eds) XXVI Brazilian Congress on Biomedical Engineering. IFMBE Proceedings, vol 70/2. Springer, Singapore. https://doi.org/10.1007/978-981-13-2517-5_69
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DOI: https://doi.org/10.1007/978-981-13-2517-5_69
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