Soft Tissue Simulation in Ultrasonic Diagnosis Using Cross-Linked Hydrophobic Gels
It is known that ultrasonic wave propagation and attenuation in biological matter depends on density, macroscopic structure, and viscoelastic properties such as the complex plane wave moduli M+ = K+ + 4/3 G+, where K+ and G+ are the complex bulk and shear moduli respectively(l). In an attempt to identify suitable tissue equivalent (TE) materials, an initial study of ultrasonic wave propagation speed, and attenuation frequency power dependence, was made on two hydrophobic gel systems. The influence of variation in chemical structure, i.e. polymerization and cross-linkage degree, was recorded in the frequency range 2–10 MHz including the effect of introducing different scattering obstacles. Two different measuring methods were used, wave amplitude transmission and a modified resonance technique originally described by Eggers(2).
KeywordsGelatine Matrix Ultrasonic Wave Propagation Attenuation Frequency Dependence Attenuation Frequency Ultrasonic Diagnosis
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