PET/CT and SPECT/CT Imaging

What is the primary radiotracer used in PET imaging?

• Tc-99m

• I-123

• F-18 FDG

• Ga-67

Which of the following best describes the principle of PET imaging?

• Emission of single gamma photons

• Detection of X-rays transmitted through the body

• Detection of coincident 511 keV photons from positron annihilation

• Emission of beta particles from radioactive decay

What is the main advantage of combining PET with CT?

• Increased spatial resolution only

• Better anatomical localization of functional data

• Improved temporal resolution

• Elimination of radiation exposure

Which component is NOT part of a PET/CT system?

• Scintillation detectors

• Coincidence circuitry

• Linear accelerator

• CT X-ray tube

The half-life of F-18 (fluorine-18) is approximately:

• 2 minutes

• 30 minutes

• 110 minutes

• 12 hours

Which of the following conditions is commonly evaluated using F-18 FDG PET/CT?

• Alzheimer’s disease

• Fracture assessment

• Gallstones

• Renal calculi

Attenuation correction in PET is primarily achieved using data from:

• MRI

• CT scan

• PET raw counts

• Ultrasound

Time-of-flight (TOF) PET improves image quality by:

• Shortening scan duration

• Enhancing soft tissue contrast

• Increasing accuracy in localizing annihilation events

• Reducing radiation dose

The spatial resolution of modern PET scanners is typically in the range of:

• 0.1–0.5 mm

• 1–2 mm

• 4–6 mm

• 10–12 mm

Which factor does NOT significantly affect FDG uptake in PET imaging?

• Blood glucose level

• Cell metabolic activity

• Patient hydration

• Gamma camera rotation speed