Strain Ratio

Introduction
It has been shown that the strain contrast values measured across slices obtained from soft tissue are similar to the modulus contrast [1]-[3]. In this work we implement the strain ratio measurement on our Sonix Touch machine and evaluate its performance on Elasticity QA phantom (CIRS, Model 049).

Experimental Setup
Referring to Fig 1, the QA phantom consists of four inclusions (i.e. two hard inclusions and two soft inclusions). Each inclusion was imaged in real-time elastography mode while a continuous longitudinal compression was applied to its surface. Once a good contrast was observed, the measurement was carried out.



Results
The results are shown in Fig. 2. The quantities results are also shown in the following Table:



Discussions and Conclusion
The results show that the strain ratio closely estimates the modulus ratio in real-time elastography. This is consistent with previously published results for off line elastography [1]-[3].