SPECT PET

Question 1

What tracer is used in PET?

Answer 1

FDG - 18F-Fluorodeoxyglucose (glucose analogue)

Question 2

What does PET show

Answer 2

Provides info on radioactivity distribution

Question 3

List 5 factors that affect PET imaging quality

Answer 3

1. Detector efficiency - depends on the detector size and material
2. System sensitivity - depends on detector efficiency and system geometry
3. Time resolution - ability to accurately determine confident events
4. Count rate capability (CRC) - Depends on detector material and properties of the electronic components
5. Spatial resolution - depends on detector size, properties of positron decay, system geometry and detector material

Question 4

Look up pet coincident event types

Answer 4

1. True coincidence
2. Random/accidental coincidence
3. Multiple coincidence
4. Scattered coincidence

Question 5

Effects of attenuation correction in PET

Answer 5

Lower resolution but more accurate representation of physiological activies

Question 6

Isotope

Answer 6

Same atomic number, different atomic mass, different neutrons

Question 7

Isotone

Answer 7

Different atomic number, different atomic mass, same neutrons

Question 8

Isobar

Answer 8

Different atomic number, same atomic mass, different neutrons

Question 9

Isomer

Answer 9

Same atomic number, mass, neutrons, but different energy states