Illustration of manual and semi-automatic nodule segmentation on CT.
The semi-automatic measurement is presented on the left, and the manual measurement on the right. At the right side of both images are 3 zoomed images from top to bottom axial, coronal and sagital plane. Note the irregularity of the manual measurements in the coronal and sagital plane. This is because manual segmentations are done in the axial plane, while semi-automatic measurements are truly 3D.