Author details

Ashkan Ghanbarzadeh Dagheyan<sup>2</sup> , Ali Molaei<sup>1</sup> , Richard Obermeier<sup>1</sup> , Aida K. Martinez3 and Jose Martinez Lorenzo1,2\*

\*Address all correspondence to: j.martinez-lorenzo@neu.edu


### References

7.3.2. Images reconstructed from the experiment

(d)

34 New Perspectives in Breast Imaging

**(a) (d)**

**(b) (e)**

**(c) (f)**

center. Parts (d)–(f) show similar images for when the ball was 5 cm off center.

8. Conclusions

Implementing the imaging algorithm described in the previous subsection, the images of the oil-bearing ball medium were reconstructed for different cases when the ℓ<sup>2</sup> norm is used as the regularizer. As shown in Figure 12, the measurements were carried out for various ball locations (two of which are shown here) and for two type of cables, regular SMA cable and phase-stable cable. Despite the presence of some artifacts, the normalized dielectric maps from the measurements agree well with those obtained from the simulations. In overall, though phase-stable cables improved the phase response of the system significantly, they were not as effective in the final imaging results. These images demonstrate that the NRI system is capable

Figure 12. Reconstructed images of a bearing ball embedded in sunflower oil. Images obtained from the data acquired by a regular SMA cable (a), a phase-stable cable (b), and simulation (c), respectively, when the ball was located 1 cm off

*x=+1cm x=-5cm*

of collecting meaningful data and generating images for a simply configured medium.

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