Evaluation of left ventricular ejection fraction using through-time radial GRAPPA

Table 2 Summary of Results of Statistical Analysis of Quantitative Parameters

	Ejection fraction	End diastolic volume	End systolic volume
For all subjects (63/63)
R²	0.98	0.96	0.98
Mean difference	−0.9%	−2.6 mL	0.3 mL
Lower 95% limit of agreement	−5.3%	−29.0 mL	−17.0 mL
Upper 95% limit of agreement	3.6%	23.9 mL	17.6 mL
p-value	0.77	0.82	0.97
Radial GRAPPA with 26 calibration frames (23/63)
R²	0.98	0.98	0.99
Mean difference	−1.7%	0.4 mL	2.9 mL
Lower 95% limit of agreement	−6.1%	−21.0 mL	−10.1 mL
Upper 95% limit of agreement	2.7%	21.7 mL	15.9 mL
p-value	0.73	0.99	0.87
Radial GRAPPA with 6 calibration frames (40/63)
R²	0.98	0.95	0.97
Mean difference	−0.4%	−4.3 mL	−1.2 mL
Lower 95% limit of agreement	−4.7%	−33.1 mL	−20.1 mL
Upper 95% limit of agreement	3.9%	24.5 mL	17.7 mL
p-value	0.90	0.78	0.93

A summary of the R² values from the regression analysis, the mean differences and upper and lower 95% limits of agreement from the Bland-Altman plots, and the p-values from the hypothesis tests of equal mean for the EF, ESV, and EDVs calculated using the two different imaging methods. The top third of the table shows values derived from all subjects, while the central and bottom thirds show the values when using only subsets of the subjects with the same number of calibration frames for the radial GRAPPA reconstructions.

ISSN: 1532-429X