Typical gamma camera detector head contains how many PMTs?

Typical gamma camera detector head contains how many PMTs?

• A. 50-70 PMTs
• B. 80-100 PMTs
• C. 100-120 PMTs
• D. 120-140 PMTs

Answer: (B)

A gamma camera detector head relies on a dense array of photomultiplier tubes to read the light produced by the scintillation crystal when gamma rays interact. Each PMT contributes a signal, and by combining all the signals (often with Anger logic) the system estimates where the gamma event occurred. To get good spatial resolution across the field of view while keeping the electronics practical, designers typically use an array of about 80 to 100 PMTs. This provides enough light sampling to localize events accurately without unnecessary complexity. Too few PMTs would blur positions, while significantly more PMTs are used mainly in specialized or higher-end systems; for a typical head, 80–100 PMTs is the standard range.

A gamma camera detector head relies on a dense array of photomultiplier tubes to read the light produced by the scintillation crystal when gamma rays interact. Each PMT contributes a signal, and by combining all the signals (often with Anger logic) the system estimates where the gamma event occurred. To get good spatial resolution across the field of view while keeping the electronics practical, designers typically use an array of about 80 to 100 PMTs. This provides enough light sampling to localize events accurately without unnecessary complexity. Too few PMTs would blur positions, while significantly more PMTs are used mainly in specialized or higher-end systems; for a typical head, 80–100 PMTs is the standard range.