TABLE 1

Measured Defect Size and Estimated and Absolute Errors for SPECT and PET Measurements as Function of Cutoff to Define Defect Area

Cutoff (% of peak)	SPECT			PET
Cutoff (% of peak)	Measured defect size	Estimated error	Absolute error	Measured defect size	Estimated error	Absolute error
30	11.1 ± 13.3	−15.1 ± 11.5*	15.1 ± 11.5	23.7 ± 22.1	−2.6 ± 4.1	4.2 ± 2.2
40	18.5 ± 19.6	−7.8 ± 6.2*	7.9 ± 6.0	25.1 ± 21.9	−1.2 ± 4.0	3.3 ± 2.3
50	24.2 ± 21.4	−2.1 ± 4.2	3.3 ± 3.3	26.0 ± 21.9	−0.3 ± 3.7	2.7 ± 2.5
60	31.1 ± 21.8	4.8 ± 5.3^†	5.4 ± 4.6	27.8 ± 22.5	1.5 ± 3.8	2.9 ± 2.9
70	45.4 ± 20.6	19.1 ± 12.9*	19.1 ± 12.9	29.0 ± 23.1	2.8 ± 4.2	3.4 ± 3.6
80	65.0 ± 17.0	38.7 ± 21.4*	38.7 ± 21.4	32.0 ± 23.8	5.7 ± 4.4^†	5.7 ± 4.4

↵*P < 0.01.
↵^†P < 0.05 vs. 0.
Data are mean %LV ± 1 SD. Estimated error is measured defect size minus true defect size; absolute error, absolute value of estimated error.