Where is radioactive tracers used?
Measure the flow of substance through an organ
How is radioactive tracers used?
Patient is injected/drinks a radioactive
isotope that emits gamma radiation
How is movement of radioactive isotope through the organ monitored?
Using gamma dector placed outside of the body
What do gamma camera do?
Picture of internal organs
How do you use gamma cameras?
Patient injected with a radioactive isotope
and emits gamma radiation
What happens to the radioactive isotope emits gamma radiation to paitent?
Isotope abosrbed and organ and gamma camera outside of the body
conntected to computer to dectect radiation and produce image
What happens to half life by using radioactive tracers and gamma cameras?
Half -life of radioactive isotope used must be long enough to give useful image of organ but must decay
shortly after image is taken
What can a narrow beam of gamma radiation be used?
Destroy cancerous tumour
gamma radiation because penetrate deeply in body
How is radioactive implants in form of small seeds/rods are used?
Place into cancerous tumours
What does radioactive implants contain?
Beta/gamma emitting isotopes
How is isotopes in radioactive implants used?
Isotope must have half-life enough to complete imagining or treatment
short enough to avoid exposing the patient to unnecessary radiation