DBIM History of engineering & technology MW magnetic field NV center Particle Swarm Optimization (PSO) Technology: general issues antenna array axial ratio beam summation methods block system inversion born approximation brain stroke breast buried objects differential imaging dynamic range electromagnetic scattering experimental measurements field illustration frequency-dimension scale imaging imaging plane calibration algorithm (IPCA) inverse scattering leakage linearized inverse scattering measurements medical MEMS microwave microwave imaging microwave tomography