Which of the following statements about gamma camera configurations is true?

• A. A gamma camera must have only a single head
• B. Gamma cameras can be single, dual, or triple head
• C. Gamma cameras require quadruple heads only
• D. Gamma cameras are not used for SPECT

Answer: (B)

Gamma cameras come in different detector-head configurations to suit different imaging needs. A single-head setup is common for straightforward planar imaging, while adding a second head increases sensitivity and can speed up acquisitions. Some systems use three heads to improve angular coverage and enhancement of tomographic quality, which is particularly useful in SPECT imaging where images are reconstructed from data taken at multiple angles around the patient. This is why the true statement is that gamma cameras can be single, dual, or triple head: they are designed to accommodate various imaging tasks, including SPECT. The idea of needing quadruple heads isn’t standard practice, and gamma cameras are indeed used for SPECT, not excluded from it.