Abstract
The great interest in high resolution (higher than 0.1 mm axially and 0.3 mm laterally) ultrasound imaging systems for application to the skin, eye, intestinal wall, etc., gives rise to the development of a high resolution ultrasound imaging system. In this study, the high resolution ultrasound imaging system with a frequency range from 20 to 40 MHz was developed. In the system described here, the different resolutions were obtained by means of the focused transducers with different center frequencies in the frequency range mentioned above. In designing and fabricating the PVDF transducer, the KLM equivalent circuit including internal loss was developed and the influence of the PVDF film and backing materials on the transducer characteristics were analyzed as well. The experimental results were compared with the analyzed results. High resolution ultrasound imaging of some soft tissue samples was obtained. Besides the ultrasound parameters such as speed of sound, the attenuation coefficient and backscattering coefficient were measured in the frequency range from 20 to 40 MHz. [Work supported by NSF of Jiangsu Province, China.]
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