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

Figure 5

(a) Lateral oblique view of the surface of a prostate model. (b) Internal tubular skeleton showing a chain of 13 atoms, each comprising a hub and 16 spokes that touch the prostate surface. (c) and (d) Illustration of corresponding points in reference and deformed models. (c) Reference model with point at 𝑖,𝑗,𝑘. (d) Deformed model with corresponding point at 𝑖^′,𝑗^′,𝑘^′. The points are on the same spoke and they have the same fractional distance from the origin (atom hub).

(a)

(b)

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(d)