Multispectral acoustic investigation of a thyroid geometrical model

The aim of this paper is to present a new noninvasive method for investigating the homogeneity of the thyroid gland geometric model. The amplitude of reflected signal depends on the shape, size and homogeneity of the object investigated acoustic as well as the signal frequency emitted by generator. The eigenvalues proportional to the resonance frequencies are obtained by using finite element method applied to discretized form of differential equations of sound propagation. The resonance frequency variations of the first three eigenvalues were presented as functions of the geometrical model size and spheres with different radii, inside thyroid, which simulate malignant nodules. Specific differences arising in the way of variation of the resonance frequencies could allow an early diagnosis of thyroid cancer. In addition, by knowing the own resonance frequencies it may be possible an acoustic heating of this region focusing solely on cancer area.