To determine the size of the tumor or to search for metastases, imaging tests are used to allow us to have a “look inside” the body. Different methods of imaging are available, which either penetrate the body from the outside with X-rays (conventional X-ray, Computer Tomography scan = CT) or magnetic field and radio waves (Magnetic Resonance Imaging = MRI). The entire body can also be examined by nuclear imaging techniques (bone scintigram, PET-CT), practically “from the inside”. Here, a (non-hazardous) radioactive tracer is administered internally, normally through an injection into the patient's