Abstract
Positron emission tomography (PET) is a diagnostic technique that has become an important method in oncology. The basis for this test is the injection of a positron-emitting radionuclide that localizes in cancers and allows imaging. A positron is a positive electron, and when emitted, travels a few millimeters before contacting an electron, which has a negative charge. These particles of equal mass and opposite charges annihilate one another. The mass of the two electrons produces two photons each with an energy of 511 keV. This is derived from the equation, e = mc2. The photons travel in opposing directions at an angle of 180°. A positron camera usually consists of a ring of detectors that are designed to identify photons interacting at precisely the same time on opposite positions on the ring (180°).
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