Table 1.

Sensitivity estimates for phantom scans using various FOV selection protocols and activity levels. Increases in sensitivity are expressed as a sensitivity increase factor, defined as the number of counts divided by the number of counts measured in the nontargeted scan

	Nontargeted	1D targeting	3D targeting
High-resolution study
Number of counts	2,807,510	6,584,623	9,754,798
Sensitivity increase factor	1	2.3	3.5
Ultra-high-resolution study
Number of counts	9,994,441	23,382,374	35,687,641
Sensitivity increase factor	1	2.3	3.6