Heterogeneous Breast Phantom Development for Microwave Imaging Using Regression Models

Table 3

Average of standard deviation (STD) for selected phantoms shown in Figure 8 over frequency range of 0.5–6 GHz.

Phantom type	Average of STD for 𝜀r	Average of STD for σ
Fat	2.015	0.056
Transitional 1	3.372	0.252
Transitional 2	0.312	0.030
Skin	3.921	0.931
Glandular	7.029	0.478