What is the primary function of the photomultiplier tube (PMT) in a gamma camera?

What is the primary function of the

Multiple choice — select the best answer

AConvert light photons from the scintillator into an amplified electrical signal
BCollimate gamma rays before they reach the crystal
CDetermine the energy of gamma rays directly
DProduce position signals by triangulation of crystal coordinates

✓ Correct answer: A. Convert light photons from the scintillator into an amplified electrical signal PMTs detect the faint light (scintillation photons) produced when gamma rays interact in the NaI(Tl) crystal and amplify that light via successive dynode stages into a measurable electrical pulse. Position determination uses the relative outputs of multiple PMTs (Anger logic).

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