High frequency ultrasound tissue characterization

Ultrasound tissue characterization has generally been carried out in the 1-5 MHz frequency range. In the present research we looked into methodologies to extend tissue characterization to the 10 - 50 MHz domain. Preliminary experiments were carried out using transducers constructed from PVDF. Initial results suggested that frequencies from 8- 20 MHz could readily be detected through tissue samples in a 3.5 cm test cell. Spectrum analysis of averaged and digitized transmitted bursts revealed differences in the transmission spectra for different tissue samples placed in the test cell.