A millimeter wave breast cancer imaging methodology

In this paper, millimeter wave free-space quasi-optical spectroscopy technique is applied to determine the transmittance, complex refractive index and complex dielectric permittivity of different human cancerous and normal breast tissues over 30 GHz to 120 GHz range. Dozens of measurements are taken on breast in many different directions. Each value of the transmittance and permittivity data is treated as a projection for further reconstruction of three dimensional breast tissue image. In the image reconstruction, Tikhonov regularization and total variation regularization are used together with inverse Radon transform.