[en] Molecular imaging is defined as the visualization of various phenomena and function of life at molecular level. Recently various imaging devices have been developed, such as single photon emission computed tomography (SPECT), positron emission tomography (PET), magnetic resonance imaging (MRI) and computed tomography (CT), optical imaging. In particular, combination PET and CT, which has brought exact anatomical and functional localization of tumor, plays an important role increasing the quality of life of cancer patients, and leads to an interest in molecular imaging in oncology. (author)