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WorksheetsPET/CT and SPECT/CT Imaging
Total questions: 20
Worksheet time: 10mins
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
What is the typical radiotracer used in SPECT for bone scans?
Tc-99m MDP
F-18 FDG
I-123
Tl-201
The primary purpose of CT in SPECT/CT is to:
Provide functional imaging only
Increase image contrast
Offer anatomical localization and attenuation correction
Replace gamma camera imaging
SPECT detects gamma rays emitted:
In coincidence
By annihilation events
Directly from decaying radionuclides
By electron capture
What is one major difference between PET and SPECT imaging?
PET uses non-ionizing radiation
SPECT uses coincidence detection
PET uses positron-emitting tracers, SPECT uses gamma emitters
SPECT is always more expensive than PET
Which collimator type is commonly used in SPECT?
Open-field
Parallel-hole
Focused-beam
Electron-beam
A typical energy window for Tc-99m imaging in SPECT is around:
70 keV
140 keV
511 keV
600 keV
Which of the following is a clinical application of SPECT/CT?
Cardiac perfusion imaging
Pulmonary embolism detection
Liver metastasis evaluation
Brain tumor grading
What is a key technical limitation of SPECT compared to PET?
Higher cost of radiotracers
Lower spatial resolution and sensitivity
Longer half-life of tracers
Excess radiation from coincidence photons
SPECT/CT systems generally acquire CT images:
Before SPECT acquisition
Simultaneously with SPECT
After MRI
Only during cardiac gating
Which detector material is most commonly used in modern SPECT systems?
Germanium
NaI (Tl) – Thallium-activated sodium iodide
Lead glass
Gadolinium oxysulfide
