Comparison of User-Directed and Automatic Mapping of the Planned Isocenter to Treatment Space for Prostate IGRT

Figure 3

Multiscale registration of a pCT with a CBCT. The planning prostate segmentation is white. ((a), (b)) Blended axial and sagittal slices of unregistered images. ((c), (d)) Axial and sagittal slices of images registered via Step (1). ((e), (f)) Axial and sagittal slices of images registered via mutual information in the prostate ROI (Step (3)). In this example, there is little difference between the second and third steps.

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