Figure 2.

Young's moduli of different types of breast tissues, measured with the same static preloading (5%) but at two loading frequencies (0.1 Hz, black bars; 4 Hz, white bars). Although the measured value of Young's modulus increases slightly with the loading frequency, the effect is not particularly marked. The practical implication of this is that, provided that the rate of change of the tissue displacement for the measurement is slow (i.e. quasi-static), static conditions can be assumed to apply. Data from Krouskop et al. [14]. DCIS, ductal carcinoma in situ.