Fig. 2
The measurement of pulmonary arteries on CTPA images. A patient was diagnosed with PH. The diameters were measured using the maximum density projection with a slice thickness of 10 mm at the bifurcation of the left and right pulmonary arteries on an axial slice (2A), where the DMPA, DRPA, and DLPA were 40.50 mm, 23.30 mm, 26.90 mm. The 3D model was segmented using the software (2B), and the centerline was fitted (2C). The centerlines of MPA (2D), RPA (2E), LPA (2F) were marked. The AMPA, ARPA, and ALPA were 1127.76 mm2, 582.59 mm2, 465.88mm2, and the VMPA, VRPA, and VLPA were 70680.46 mm3, 44664.05 mm3, 47667.77 mm3. (Abbreviations: DMPA, the diameter of main pulmonary artery; AMPA, the cross-sectional area of main pulmonary artery; VMPA, the volume of the main pulmonary artery; DRPA, the diameter of the right pulmonary artery; ARPA, the cross-sectional area of the right pulmonary artery; VRPA, the volume of right pulmonary artery; DLPA, diameter of left pulmonary artery; ALPA, cross-sectional area of left pulmonary artery; VLPA, the volume of the left pulmonary artery)