Feasibility Study of Automated Framework for Estimating Lung Tumor Locations for Target-Based Patient Positioning in Stereotactic Body Radiotherapy

Figure 4

Illustrations of (a) an MV-CBCT image, (b) a search region extracted from the MV-CBCT image, (c) an edge-enhanced image obtained using the Sobel filter in the search region, and (d) a tumor-enhanced image obtained using the BSE filter in the search region.