Figure 2.

Registration contours for one image pair. Body (green), thorax (red), and lung (blue) contours required for registration are shown for the inhale prone (top) and inhale supine (bottom) images of one patient. Note the large air pockets that have been excluded from both the whole-body and thorax masks in the sagittal and coronal views of the inhale prone image (magnified), which are not present in the supine image. (A color version of this figure is available at http://doi.dx.10.1016/j.adro.2018.08.023.)