Numerical model of Lamb wave propagation in the tapered septal wall of the heart

Sabbadini, Alberico; Caenen, Annette; Vos, Hendrik J.; Jong, Nico de; Verweij, Martin D.

doi:10.1121/2.0001226

Cited by 1 publication

(1 citation statement)

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“…Second, the wave traveling in the section develops, during propagation, a split in left and right wavefronts at depths greater than approximately 20% of the thickness; this feature has already been reported in literature and is probably associated with the presence of the A1 mode besides the A0 mode. 26,43 Third, close to the top surface in the flat section, the split is not present and the attenuation appears to be weaker.…”

Section: A Experimentsmentioning

confidence: 99%

Tapering of the interventricular septum can affect ultrasound shear wave elastography: An in vitro and in silico study

Sabbadini

Caenen

Keijzer

et al. 2021

The Journal of the Acoustical Society of America

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Shear wave elastography (SWE) has the potential to determine cardiac tissue stiffness from non-invasive shear wave speed measurements, important, e.g., for predicting heart failure. Previous studies showed that waves traveling in the interventricular septum (IVS) may display Lamb-like dispersive behaviour, introducing a thickness-frequency dependency in the wave speed. However, the IVS tapers across its length, which complicates wave speed estimation by introducing an additional variable to account for. The goal of this work is to assess the impact of tapering thickness on SWE. The investigation is performed by combining in vitro experiments with acoustic radiation force (ARF) and 2D finite element simulations, to isolate the effect of the tapering curve on ARF-induced and natural waves in the heart. The experiments show a 11% deceleration during propagation from the thick to the thin end of an IVSmimicking tapered phantom plate. The numerical analysis shows that neglecting the thickness variation in the wavenumber-frequency domain can introduce errors of more than 30% in the estimation of the shear modulus, and that the exact tapering curve, rather than the overall thickness reduction, determines the dispersive behaviour of the wave. These results suggest that septal geometry should be accounted for when deriving cardiac stiffness with SWE.

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Section: A Experimentsmentioning

confidence: 99%