The PET/CT (Positron Emission Tomography) does not differ in principle from the other nuclear medicine procedures (The scintigraphy, SPECT). Here, too, the patient receives a radioactive substance (radiopharmaceutical) and is examined with the PET scanner after a certain enrichment phase. The special feature of PET results from the decay type of the radioisotopes used, the so-called “positron emitters”: these have particularly favorable physical properties for measurement and imaging, which is why they achieve a higher spatial resolution compared to the other nuclear medicine procedures, which means that even very small lesions in the organism can be detected.