Fig. 1
From: Surface scanning for 3D dose calculation in intraoperative electron radiation therapy
Conversion from 3D surface into pseudo-CT study. (a) 3D surface with a green contour delineated close to the mesh edge. (b) Extra walls generated after extruding the contour close to the mesh edge. (c) Green lid covering those extra walls to obtain a watertight surface. (d) Axial view of the 3D binary image generated after applying the ray intersection method to the watertight surface. The matrix size of this 3D image is limited to the boundaries of the watertight surface. (e) Axial view of the 3D binary image after correcting the region above the lid. (f) Axial view of the pseudo-CT study obtained by increasing the matrix size of the 3D binary image, and then by setting the black voxels to the CT value of air and the remaining voxels to the CT value of water (orange colour in the pseudo-CT study)