Table 3.

Gain for different objects and axial length of total body PET systems

Axial length	Gain in single organ sensitivity vs 20 cm axial length	Gain in body sensitivity (1–2-m-long object) vs 20 cm axial length
70 cm	2.5–3.5 ×	9–10 ×
100 cm	2.5–3.5 ×	15–20 ×
140 cm	2.5–3.5 ×	20–30 ×
200 cm	2.5–3.5 ×	30–40 ×