Pulmonary Vein Measurements:
The following indices were calculated for each of the PVs once the PV
maximum diameter (PVmaxD) and minimum diameter (PVminD) were obtained
from MPR images on cCT at the level of the ostium: (1)
EI=PVmaxD/PVminD,16 (2)
OI = 2 x
(PVmaxD-PVminD/PVmaxD+PVminD)16and (3) PVA= π x PVmaxD x PVminD. PV EI values between 1.2-1.4 were
representative of ovality while <1.2 were circular and
> 1.4 considered as flat. For the OI, higher values were
more representative of ovality.