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One design for a PET detector capable of measuring depth of interaction. When the 511 keV gamma interacts in any of the scintillator crystals, some light is detected by the common photomultiplier tube, which provides a timing signal. Some light is detected by one of the elements of the photodiode array, which determines the crystal of interaction. The sums of the two signals provides the energy, while the ratio gives the depth of interaction.
