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. Author manuscript; available in PMC: 2015 Aug 1.
Published in final edited form as: Magn Reson Med. 2013 Oct 1;72(2):485–491. doi: 10.1002/mrm.24942

Table 2.

R2*Iron-median and R2*Iron-ROI_based versus R2*CMRTools for the three cohorts of patients.

Paired t-test Regression Analysis Bland Altman CoV
(%)
Mean
Values
(Hz)
P Slope P for
Slope
≠1
Intercept
(Hz)
R-
squared
Mean
diff
(Hz)
Limits
(Hz)
a) First single-center cohort: black blood images
R2*Iron-median
vs
R2*CMRTools
48.9±55.0
vs
48.2±53.1
0.258 1.036±0.007 <0.0001 −1.007±0.473 0.998 0.7 −5.0 to
6.5
4.37
R2*Iron-ROI_based
vs
R2*CMRTools
48.9±52.7
vs
48.2±53.1
0.063 0.993±0.007 0.336 1.058± 0.512 0.998 0.7 −4.1 to
5.5
3.66
b) Second single-center cohort: bright blood images
R2*Iron-median
vs
R2*CMRTools
47.7±38.2
vs
47.2±36.9
0.085 1.035±.006 <0.0001 −1.190±0.373 0.998 0.4 −4.0 to
4.9
3.45
R2*Iron-ROI_based
vs
R2*CMRTools
47.5±37.4
vs
47.2±36.9
0.050 1.013±0.004 0.002 −0.245±0.247 0.999 0.4 −2.3 to
3.0
2.06
c) Multi-center cohort
R2*Iron-median
vs
R2*CMRTools
43.7±22.4
vs
43.8±22.7
0.989 0.982±0.007 0.015 0.705±0.359 0.997 −0.1 −2.7 to
2.6
2.25
R2*Iron-ROI_based
vs
R2*CMRTools
44.0±22.5
vs
43.8±22.7
0.207 0.989±0.007 0.131 0.681±0.352 0.997 0.2 −2.3 to
2.7
2.07