Table 1.

CZT-based gamma camera versus conventional scintillator-based gamma camera: CZT is preferred to scintillator [7–11]

	CZT	Scintillator
Count sensitivity	×5 (cardiac), ×10 (point source)	×1
Spatial resolution	4–5 mm (×2–3 better)	10–11 mm
Acquisition time	2–3 min (theoretically), 5–10 min (practically)	10–20 min
Injection dose for Tc-99m agents	2–5 mCi (theoretically), up to 15 mCi (practically)	>10 mCi
Radiation exposure	4–6 mSv	9–20 mSv
Energy resolution	5.7 % (×1.65 better)	9.4 %
Maximum counts rate for input function evaluation	Linear up to maximum	Intrinsically limited by detector dead time
Size	Compact	Bulky

CZT cadmium-zinc-telluride