Table 2.

Variation of sphere CRpeak in L-mode

Camera	Sphere (mm)	L-mode	H-mode (different measurement)
Symbia	37	0.99 to 1.62	1.14 ± 0.04
	28	0.59 to 1.2	1.05 ± 0.03
	22	0.31 to 0.88	0.63 ± 0.0
	17	0.2 to 0.42	0.4 ± 0.03
	13	0.15 to 0.21	0.22 ± 0.01
	10	0.1 to 0.17	0.16 ± 0.01

This table provides the range of CRpeak observed with L-mode depending on the variation in sphere localization, which resulted from repeated acquisitions of the NEMA IEC phantom after rotating the phantom or turning it from supine to prone position (Symbia camera only). For comparison, mean ± SD of CRpeak with H-mode are provided, which were obtained from serial measurements without changing the phantom position (see also Table 1).