Fig. 6

Distances from the nine points on the left atrial (LA) roof to the adjacent bronchus and pulmonary artery (PA). a–c Shortest spatial distances from the right, middle, and left points on the anterior, middle, and posterior layers of the LA roof to the adjacent bronchi, respectively. d–f Shortest spatial distances from the right, middle, and left points on the anterior, middle, and posterior layers of the LA roof to the adjacent PA, respectively. The black dots represent the distance closer to the right bronchus or PA, and the red dots represent the distance closer to the left bronchus or PA. The dotted line denotes the distance of 5 mm