Table 2.

Longitudinal Errors in PET Dose Calibrator and Scanner Measurements (Unitless).

Site*	DC† Error Scan 1	DC† Error Scan 2	Change in DC† Error	PET‡ Error Scan 1	PET‡ Error Scan 2	Change in PET‡ Error
1	9.0%	-50.3%§	-59.3%	-3.4%	-26.8%	-23.4%
2	8.4%	8.7%	0.3%	13.2%	1.1%	-12.0%
3	8.1%	8.8%	0.7%	6.0%	6.4%	0.4%
4	-0.4%	-2.5%	-2.1%	-7.6%	-14.2%	-6.6%
5	-0.3%	-3.8%§	-3.5%	-6.6%	-15.1%	-8.5%
6	1.8%	2.1%	0.3%	-18.2%	-7.1%	11.1%

^*Site numbers are same in Tables 2 and 3 but in different order than in Table 1.

^†Dose calibrator activity measurement.

^‡PET scanner activity concentration measurement.

^§Dose calibrator settings different for second measure.