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FIGURE 2. Axial images of planning CT showing the use of RIS in modifying the prostate-bed CTV. Normal structures: bladder (blue), and rectum (green). (A) The CTV_pre (red) was entered before the RIS/CT fusion. CTV_RIS (yellow) is the projection of the delineated uptake on the RIS scan into the planning CT. (B) CTV_RIS was used to modify CTV_pre to define CTV_post (aqua). In this case, CTV_post is the union of CTV_pre and CTV_RIS in A.

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