Table 4: Correlation between MRA methods and CE-CTA concerning the accurate determination of APE grading (Grades 0, 1, and 2).

The r-value indicates the Spearman’s correlation coefficient, and p-values show whether the correlation coefficient is significantly different from 0.

	Radial QISS-MRA vs. CE-CTA	Cartesian bSSFP-MRA vs. CE-CTA	Radial QISS vs. Cartesian bSSFP-MRA
Pulmonary arterial regions	r-value p-value
Central arteries	0.88 <0.0001	0.74 <0.0001	0.79 <0.0001
Lobar arteries	0.88 <0.0001	0.70 <0.0001	0.76 <0.0001
Peripheral arteries	0.82 <0.0001	0.67 <0.0001	0.69 <0.0001