Matrix pencil estimation of guided waves dispersion in a human skull

Matteo Mazzotti, Christopher Sugino, Alper Erturk, Massimo Ruzzene

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Guided Ultrasonic Waves (GUWs) have been recently proposed as an alternative to more classical ultrasonic-based techniques in brain imaging and therapy. The efficient and effective use of GUWs is strongly related to the a priori knowledge of the Lamb wave-type dispersion behavior of the cranial region adjacent to the inspected brain location. In this context, few studies have been proposed in which only A{0} and quasi Rayleigh modes are reliably detected, whereas different high-order supersonic modes cannot be clearly distinguished due to severe scattering associated to the spongeous structure of the diploë. In this work, it is demonstrated that high order modes can be excited and recorded at low and mid frequencies (<1.0 MHz) in a dry human skull. Specifically, Lamb waves are generated in the upper parietal region of the skull by using short tonebursts, while their corresponding velocity fields are recorded by means of an infrared scanning laser Doppler vibrometer. The frequency-wavenumber spectra are obtained from the recorded wave fields using the Matrix Pencil Method. Finally, the different Lamb modes in the spectra are classified using a three-layered Semi-Analytical Finite Element model in which the thickness of the cortical and trabecular layers is assumed from CT-scan images of the scanned area. The obtained results indicate that the elastic properties of the brain can be potentially assessed by totally noninvasive procedure. In addition, they open up to the possibility to penetrate inaccessible regions of the brain for imaging purposes by exploiting their intrinsic radiation properties.

Original languageEnglish
Title of host publicationIUS 2020 - International Ultrasonics Symposium, Proceedings
ISBN (Electronic)9781728154480
DOIs
StatePublished - 7 Sep 2020
Event2020 IEEE International Ultrasonics Symposium, IUS 2020 - Las Vegas, United States
Duration: 7 Sep 202011 Sep 2020

Publication series

NameIEEE International Ultrasonics Symposium, IUS
Volume2020-September
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Conference

Conference2020 IEEE International Ultrasonics Symposium, IUS 2020
Country/TerritoryUnited States
CityLas Vegas
Period7/09/2011/09/20

Keywords

  • Cranial Lamb waves
  • Dispersion
  • Elastic parameter identification
  • Matrix Pencil Method
  • Semi-Analytical Finite Element method
  • Trabecular and cortical bone

Fingerprint

Dive into the research topics of 'Matrix pencil estimation of guided waves dispersion in a human skull'. Together they form a unique fingerprint.

Cite this