Table 2.

Peak contrast of estimated complex permittivity at 2.5 GHz of a malignant spherical inclusion in a homogeneous breast interior. For reference, the electrical size of the inclusion diameter in each background tissue is given in wavelengths.

Background	Exact Contrast	Peak Estimated Contrast (inclusion diameter)
		(2 mm)	(6 mm)	(10 mm)	(14 mm)	(18 mm)	(22 mm)
Fibroglandular,		(0.11λ)	(0.34λ)	(0.57λ)	(0.80λ)	(1.03λ)	(1.26λ)
$max({\epsilon }_{\text{rel}}/{\epsilon }_{\text{rel}}^b)$	1.15	1.00	1.05	1.10	1.17	1.18	1.19
$max({\sigma }_{\text{eff}}/{\sigma }_{\text{eff}}^b)$	1.13	1.00	1.03	1.07	1.12	1.14	1.15
Transitional,		(0.08λ)	(0.23λ)	(0.39λ)	(0.54λ)	(0.70λ)	(0.85λ)
$max({\epsilon }_{\text{rel}}/{\epsilon }_{\text{rel}}^b)$	2.55	1.02	1.27	1.77	2.57	2.98	2.88
$max({\sigma }_{\text{eff}}/{\sigma }_{\text{eff}}^b)$	2.99	1.02	1.28	1.78	2.47	2.73	2.94
Adipose,		(0.04λ)	(0.11λ)	(0.18λ)	(0.25λ)	(0.33λ)	(0.40λ)
$max({\epsilon }_{\text{rel}}/{\epsilon }_{\text{rel}}^b)$	11.6	1.01	1.12	1.39	2.16	5.25	9.16
$max({\sigma }_{\text{eff}}/{\sigma }_{\text{eff}}^b)$	22.1	1.01	1.17	1.57	2.71	7.15	16.3