  This work presents a Boundary Element Method (BEM) formulation for
contactless electromagnetic field assessments. The new scheme is based on a
regularized BEM approach that requires the use of electric measurements only.
The regularization is obtained by leveraging on an extension of Calderon
techniques to rectangular systems leading to well-conditioned problems
independent of the discretization density. This enables the use of highly
discretized Huygens surfaces that can be consequently placed very near to the
radiating source. In addition, the new regularized scheme is hybridized with
both surfacic homogeneous and volumetric inhomogeneous forward BEM solvers
accelerated with fast matrix-vector multiplication schemes. This allows for
rapid and effective dosimetric assessments and permits the use of inhomogeneous
and realistic head phantoms. Numerical results corroborate the theory and
confirms the practical effectiveness of all newly proposed formulations.
