**5. Conclusions**

This chapter investigated the 3D HMMW method for various concealed objects detection and the theory has been evaluated through numerical and experimental validations. It was found that various small concealed metallic and wood objects with different sizes and locations can be identified in the reconstructed HMMW images. Results showed that the proposed HMMW has the potential for investigating characterization and structure of concealed objects. The potential applications of the 3D HMMW include on body weapon detection and packed food quality control.
