Multicrystal gamma cameras utilize an array of crystals that are coupled to _______________

Multicrystal gamma cameras utilize an array of crystals that are coupled to _______________

• A. PMTs
• B. PSPMTs or photodiodes
• C. CCD sensors
• D. Geiger-Müller tubes

Answer: (B)

Light from the scintillation crystals must be captured by photodetectors that also provide position information. When a gamma photon interacts in the crystal, it produces a burst of visible light. To know exactly where within the crystal array that event occurred, the light needs to be collected by detectors that are sensitive to small light signals and can give spatial information. Position-sensitive photomultiplier tubes (PSPMTs) are designed to determine the interaction location from the light distribution across the detector. Photodiodes, as solid-state devices, can be arranged in an array to achieve the same readout with modern, compact hardware. Other options, like CCD sensors or Geiger-Müller tubes, aren’t used in this readout role for multicrystal gamma cameras, and traditional PMTs alone don’t inherently provide the necessary position information in a compact array. Hence, the crystals are coupled to PSPMTs or photodiodes.

Light from the scintillation crystals must be captured by photodetectors that also provide position information. When a gamma photon interacts in the crystal, it produces a burst of visible light. To know exactly where within the crystal array that event occurred, the light needs to be collected by detectors that are sensitive to small light signals and can give spatial information. Position-sensitive photomultiplier tubes (PSPMTs) are designed to determine the interaction location from the light distribution across the detector. Photodiodes, as solid-state devices, can be arranged in an array to achieve the same readout with modern, compact hardware. Other options, like CCD sensors or Geiger-Müller tubes, aren’t used in this readout role for multicrystal gamma cameras, and traditional PMTs alone don’t inherently provide the necessary position information in a compact array. Hence, the crystals are coupled to PSPMTs or photodiodes.