On the assessment of time-shift variations from backscattered ultrasound for large temperature changes in biological phantoms

Teixeira, C. A.; Ruano, M. Graça; Pereira, W. C. A.

http://hdl.handle.net/10400.1/5863

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Authors

Teixeira, C. A.

Ruano, M. Graça

Pereira, W. C. A.

Abstract(s)

This work reports the assessment of time-shifts (TS) from backscattered ultrasound (BSU) signals when large temperature variations (up to 15 degrees C) were induced in a gel-based phantom. The results showed that during cooling temperature is linear with TS at a rate of approximately 74 ns/degrees C. However during a complete heating/cooling cycle, the relation is highly non-linear. This can be explained by the fact that during cooling the temperature distribution is more uniform. Another problem to report is that TS is very sensitive to external movements.