Fig. 2
From: Improved precision of noise estimation in CT with a volume-based approach
Subsection of the CT images around the carina (window width 1600 HU, window level −700 HU). The red part is the position of the region of interest, the blue is the volume of interest, the yellow is used to measure the ground truth, and the green area was removed from the segmentation to prevent edge artifacts like the partial volume effect. This image shows the measurement with the isocenter 1.0 cm above the carina ridge. a Axial images. b Coronal images, interpolated to account for the anisotropic dimensions of the voxels. c Volume render of the yellow segmentation