Fig. 4From: 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 right main pulmonary artery, so the obstructive index was scored as 25%. B The ratio of RV/LV diameter for the same patient was 1.06 cmBack to article page