Table 1.

Theoretical lower limit of detection (LLD) for PET/CT and PET/MRI with respect to cell number and specific activity

	6-well plates		3 × 3 cubic-well
	LLDPET/MRI	LLDPET/CT	LLDPET/MRI	LLDPET/CT
Cell number	5.24 × 105 (1.05 × 104)*	5.88 × 105 (1.07 × 104)*	4.56 × 105 (2.84 × 103)*	4.83 × 105 (3.22 × 103)*
Specific activity [kBq/106 cells]	3.26 (0.07)*	3.72 (0.07)*	5.46 (0.03)*	5.25 (0.04)*

*Values in parentheses indicate the theoretical LLD values according to the Rose criterion (CNR = 5) as a threshold for detectability