Interactions between waves can be turned into profit to break diffraction limits and invent new kinds of medical images. It consists in productively combining two very different waves — one to provide contrast, another to provide spatial resolution — in order to build a new kind of image. Contrary to multimodality medical imaging that remains the superposition of two different images limited by their respective contrast/resolution couples, MultiWave imaging overcomes this limitation by providing a unique image of the most interesting contrast with the most interesting resolution. MultiWave imaging can benefit from three different potential interactions among waves that will be described in this paper.