Lassoan thanks for your reply!
I mean…Instead of picture 1 (draw tool) to delimit de ROI area, use dots (only 1 “click” ) to delimit ROI segment, picture 2.
IMO the problem using grow from seed or threshold tool for this patients is that the basal zone or more injured zones the results are no so good as in healthy lungs, for this reason my interest in segmenting manually the ROI.
Thanks you so much again!