Contrast Source–Based Physics-Driven Neural Network for Inverse Scattering Problems

Deep neural networks (DNNs) have recently been applied to inverse scattering problems (ISPs) due to their strong nonlinear mapping capabilities.However, supervised DNN solvers require large-scale datasets, which limit their generalization in practical applications.Untrained neural networks (UNNs) address this issue by updating weights from measured electric fields and prior physical knowledge, but existing UNN solvers suffer from long inference time.To overcome these limitations, this paper proposes a contrast source-based physicsdriven neural network (CSPDNN), which predicts the induced current distribution to improve efficiency and incorporates an adaptive total variation loss for robust reconstruction under varying contrast and noise conditions.The improved imaging performance is validated through comprehensive numerical simulations and experimental data.