作者: Uwe Haberkorn
DOI: 10.1007/978-3-540-77496-9_2
关键词: Positron 、 Positron emission tomography 、 Collimated light 、 Genetic transfer 、 Annihilation 、 Nuclear magnetic resonance 、 Gamma ray 、 Physics 、 Single-photon emission computed tomography 、 Photon 、 Nuclear medicine
摘要: Both positron emission tomography (PET) and single photon computed (SPECT) use radioactively labeled molecules that interact with a specific cellular target after injection. Images are formed by the detection of gamma rays, X-rays, or annihilation quanta (in case imaging). If emitters used, direction flight has to be determined geometric collimation. In contrast, coincidence exploits unique feature which results in two high energy rays simultaneously emitted back-to-back.