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Optimization of ultrasonic elastography by coded excitation and transmit-side multi-frequency compounding

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Abstract

To improve the quality of ultrasonic elastography, by taking the advantage of code excitation and frequency compounding, a transmitting-side multi-frequency with coded excitation for elastography (TFCCE) was proposed. TFCCE adopts the chirp signal excitation scheme and strikes a balance in the selection of sub-signal bandwidth, the bandwidth overlap and the number of sub-strain image based on theoretical derivation, so as to further improve the quality of elastic image. Experiments have proved that, compared with the other optimizing methods, the elastographyic signal-to-niose ratio(R e-SN) and contrast-to-noise ratio(R e-CN) are improved significantly with different echo signal-to-noise ratios (R eSN) and attenuation coefficients. When R eSN is 50 dB, compared with short pulse, R e-SN and R e-CN obtained by TFCCE increase by 53% and 143%, respectively. Moreover, in a deeper investigation (85–95 mm), the image has lower strain noise and clear details. When the attenuation coefficient is in the range of 0-1 dB/(cm·MHz), R e-SN and R e-CN obtained by TFCCE can be kept in moderate ranges of 5<R e-SN<6.8 and 11.4<R e-CN<15.2, respectively. In particular, for higher tissue attenuation, the basic image quality cannot be ensured with short pulse excitation, while mediocre quality strain figure can be obtained by TFCCE. Therefore, the TFCCE technology can effectively improve the elastography quality and can be applied to ultrasonic clinical trials.

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Authors and Affiliations

  1. College of Computer Science, Sichuan University, Chengdu, 610065, China

    Zhi-hong Zhang  (张志宏), Hao-lin Liu  (刘昊霖), Ying-ni He  (何颖妮) & Dong-quan Liu  (刘东权)

  2. Saset Healthcare Inc, Chengdu, 610041, China

    Dong-quan Liu  (刘东权)

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  1. Zhi-hong Zhang  (张志宏)
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  2. Hao-lin Liu  (刘昊霖)
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  3. Ying-ni He  (何颖妮)
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  4. Dong-quan Liu  (刘东权)
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Correspondence to Hao-lin Liu  (刘昊霖).

Additional information

Foundation item: Project(2013GZX0147-3) supported by the Natural Science Foundation of Sichuan Province, China

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Zhang, Zh., Liu, Hl., He, Yn. et al. Optimization of ultrasonic elastography by coded excitation and transmit-side multi-frequency compounding. J. Cent. South Univ. 21, 1003–1010 (2014). https://doi.org/10.1007/s11771-014-2030-4

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  • DOI: https://doi.org/10.1007/s11771-014-2030-4

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