Electromagnetic waves have long been used in medical settings for diagnostic purposes, such as for the detection of cancerous tissues, stroke events or cardiovascular risk, as the behaviour of the waves upon meeting their target gives pertinent information for diagnostic and imaging purposes. This edited book presents advances in the use of electromagnetic waves and antennas in healthcare settings, both as diagnostic tools (such as radar-based imaging, holographic microwave imaging, thermoacoustic imaging systems), and therapeutic interventions (such as microwave ablation therapies for cancer). Written by an international team of biomedical engineering researchers, it discusses all aspects related to the design and modelling of electromagnetic imaging techniques, electromagnetic devices, wireless implants, wearable systems and wireless sensor networks and in vitro and in vivo testing. Design issues for wearable antennas, wearable sensors, magnetic coils and coil array issues are explored and biomedical applications such as cancer detection, stoke event detection, GI diagnostics, and cardiovascular risk prediction are discussed. The book also explores scattering problems of electromagnetic waves between different tissues, and how these complex scattering problems can be resolved. This book will be of interest to researchers and engineers in the electromagnetic wave community, those in antenna research, biomedical engineering and related fields.