Topic 42 Flashcards
1
Q
What is positron emission tomography?
A
Radionuclei that release positrons introduced in body
Gamma rays produced when the positrons encounter electrons
Used in the brain
2
Q
Give three important factors of PET
A
Positron emitters have short half life, produced by cyclotrones
High probability of detecting gamma rays
Ring geometry and Computer monitored coincidence checking are ideally suited to produce tomographs.
3
Q
What is Nuclear magnetic resonance imaging?
A
Uses the magnetic fields of nuclei as small magnetic dipols
Atoms behave differently in different tissues.
No hazardous radiation
Exepnsive and risks claustrophobia
