Fig. 3From: Correlation between severity of pulmonary embolism and obstructive sleep apnea using computed tomography pulmonary artery obstruction index and right ventricular to left ventricular diameter ratio as severity indicesA Axial post-contrast MSCT shows a partially occluded left lower lobar artery (arrow), so the obstructive index was scored as 12.5%. B The ratio of RV/LV diameter for the same patient was 0.9 cmBack to article page