Automatic Approach Seeking Optimal Frequency Modulation Parameters In Chirp Inversion and Chirp Reversal Ultrasound Contrast Imaging

Abstract : State-of-the art applications involving frequency coded excitations known as chirp excitations, are cutting edge in contrast ultrasound imaging. A question may arise: How does the manufacturer select the frequency modulation parameters of chirp excitations in clinical practice? The present study aims to select, automatically, the optimal frequency modulation parameters of chirp excitations by maximizing the backscattered power using two post-processing techniques: chirp inversion and chirp reversal imaging. Our simulation setup consisted of a transducer (central frequency 2.25 MHz), microbubble with diameter 5 μm reception phase and optimization feedback. Fifty iterations were carried out, during each, the medium was insonified with two either out-of-phase to time reversed chirp excitations having a linear frequency modulation law and a driving pressure 100 kPa. Simulations revealed that optimal command was advantageous over the standard technique in both chirp inversion and reversal techniques. In chirp inversion, the gain reached 7.2 dB, and the maximum backscattered power was achieved after 24 iterations. The transmitted frequency has decreased by 0.73 MHz, and the second modulation index increased by 0.13 MHz/s compared to the standard optimization. In chirp reversal, the gain has reached 17.4 dB, the transmitted frequency decreased by 0.8 MHz and the frequency modulation index increased by 0.03 MHz/s compared to the standard optimization. Our chirp reversal pre-processing optimization approach paves the way for improved ultrasound contrast images. As a future progress we tend to validate our findings in vitro.
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Poster
The Second Science Meeting. Doctoral School of Sciences and Technology, Lebanese University, (2012)., Jun 2012, Hadath, Lebanon
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http://www.hal.inserm.fr/inserm-01182641
Contributeur : Amira Zaylaa <>
Soumis le : samedi 1 août 2015 - 17:34:32
Dernière modification le : mercredi 21 mars 2018 - 10:54:02
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Amira Zaylaa, Sébastien Ménigot, Jamal Charara, Jean-Marc Girault. Automatic Approach Seeking Optimal Frequency Modulation Parameters In Chirp Inversion and Chirp Reversal Ultrasound Contrast Imaging. The Second Science Meeting. Doctoral School of Sciences and Technology, Lebanese University, (2012)., Jun 2012, Hadath, Lebanon. 〈inserm-01182641〉

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