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Positron Emission
Tomography
Summary
www.howpetworks.com
1
Positron Emission Tomography
• Radioactive tracer isotope with short halflife produced in a cyclotron
• Tracer injected into patient, emitting
positrons
• Positron-electron annihilation produces
gamma rays moving in opposite directions
• Gamma rays detected in a PET scanner
Positron Emission Tomography
• Applications of PET
– Cancer treatment
– Scanning of bodily function
– Drug testing
• How PET differs from X Rays
– PET images function rather than taking a
picture
– Emitter is inside the body
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