Abstract
Numerous biomechanical imaging techniques have been proposed for tissue examination and detection of pathologies.. In this study, a finite element model is developed to investigate contrast-transfer efficiency of harmonic motion imaging for viscoelastic soft tissues. Direct-solution steady-state dynamic analysis is used to compute the dynamic displacement amplitude in finite element simulations. Then, the contrast-transfer efficiency of harmonic motion imaging is investigated for different inclusion to background contrast ratios. The effect of excitation frequency and material viscosity on contrast-transfer efficiency is also studied. The results suggest that the contrast-transfer efficiency of harmonic motion imaging generally decreases as the viscosity of the tissue increases. Contrast-transfer efficiency of a higher excitation frequency declines faster as the viscosity of the tissue increases. Harmonic motion imaging is less efficient in depicting the stiffness contrast of soft inclusion in hard background than that of hard inclusion in soft background for high viscosity materials.
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