Born Approximation Observations - Introduction to Imaging from Scattered Fields - page 89

ε r = 3.7 ε r = 3.8 ε r = 3.9 ε r = 4.1 ε r = 4.2 ε r = 4.3 ε r = 4.4 ε r = 4.5

ε r = 4.6 ε r = 4.7 ε r = 4.8 ε r = 4.9 ε r = 5.1 ε r = 5.2 ε r = 5.3 ε r = 5.4

ε r = 5.5 ε r = 5.6 ε r = 5.7 ε r = 5.8 ε r = 5.9
Note: There are 360 receivers, a resolution of 250 × 250 on each image with increasing permittivity going from left to right and down the page. The permittivity is shown underneath each
target.