For imaging high-energy photons (e.g., 364 keV from I-131), which collimator is required?

For imaging high-energy photons (e.g., 364

Multiple choice — select the best answer

ALow-energy high-resolution (LEHR)
BHigh-energy general purpose (HEGP)
CMedium-energy general purpose (MEGP)
DPinhole

✓ Correct answer: B. High-energy general purpose (HEGP) I-131 emits 364 keV photons, which require thick septa to prevent penetration. High-energy general purpose (HEGP) collimators have thick lead septa designed for photon energies above ~300 keV. LEHR is for Tc-99m (140 keV) only.

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For imaging high-energy photons (e.g., 364 keV from I-131), which collimator is required?

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