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What collimator is used the most in nuclear medicine and why?

What collimator is used the most in nuclear medicine and why?
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Parallel hole collimator is used the most in nuclear medicine.

Parallel hole collimator's function is to allow only perpendicular photons to strike the crystal and hence it allow only photons traveling in a direction perpendicular to the detector head to interact with the crystal, it is the primary factor in limiting the resolution of the system, and is also largely responsible for system sensitivity.

Due to its high resolution and sensitivity, it is the mostly used collimator in nuclear medicine.

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