ENGINEER 1C03 Lecture Notes - Lecture 12: Magnetic Resonance Imaging, Atomic Number, Angular Velocity
9 Nov 2017
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Discuss the interaction of electrons and positrons resulting in the production of gamma rays. When a positron meets an electron they annihilate" each other, converting their combined energy and mass into two gamma rays ( rays). The energy of each of these gamma rays is 0. 51 mev (million electron volts) and they travel in opposite directions conserved in the interaction in accordance with the respective laws. This process is sometimes called pair annihilation. momentum and electrical charge must be: describe how the positron emission tomography (pet) technique is used for diagnosis. Using particular radio-pharmaceuticals, a cross-sectional image through an organ can be obtained or a region of the body can be imaged, allowing the function of an area to be determined. The radiopharmaceutical is usually injected into the patient but sometimes the chemical is inhaled. After a short period of time the radiopharmaceutical has accumulated in particular areas of the body and begun to decay by the emission of positrons.
