Table 2.

Summary of mean values of R2*, R2 and R2′ for cortical gray matter obtained at 3T MRI by different methods. There are two ways of calculating R2' in this paper: [a] R2'=R2*-R2, [b] R2'=ζ·δω

Source	Method	Number of subjects (age)	R2* [s−1] mean	R2 [s−1] mean	R2' [s−1] mean
This paper	mGRE	8 (23–30)	17.8±0.5	15.1± 0.6	5.1±0.3 [a] 5.1±0.2 [b]
Gelman et al., 1999 (30)	GESFIDE	6 (19–42)	Not available	14.4±1.8 (frontal cortex)	3.4±1.1 (frontal cortex)
He and Yablonskiy, 2007 (18)	GESSE	6	Not available	14.9±0.2	2.9±0.4
Paling et al., 2012 (31)	mGRE for R2* Fast SE for R2	21 (mean age 36)	Not available	Not available	9.2±1.1
West et al., 2013 (32)	QRAPMASTER (qMAP)	10 (21–29)	Not available	10.69±0.76 (frontal)	Not available
Sedlacik et al., 2014 (33)	mGRE for R2* mTES for R2	66 (only use age ≤ 30)	15.5 (14.8–16.2) (frontal cortex)	8.5 (8.2–8.9) (frontal cortex)	7.1 (6.5 to 7.8) (frontal cortex)
Ni et al., 2014 (29)	Multiple methods	10 (24–25)	Not available	Not available	2.7 to 3.5