Figure 1.

Rectal and bladder contours on planning computed tomographies and daily megavoltage computed tomographies (MVCTs). A, Rectal contour (brown) delineated on CK planning computed tomography (CT) for patient 5. B, Rectal contour delineated on an MVCT acquired during external beam radiotherapy, shown on same slice as (A). C, Bladder contour (yellow) delineated on CK planning CT for patient 1. D, Bladder contour delineated on MVCT acquired during external beam radiotherapy, shown on same slice as (C). For (A) to (D), prescription isodose line (19 Gy) is shown in purple, whereas the 75% isodose line (14.25 Gy) is shown in teal. Note: The color version of the figure is available at journals.sagepub.com/home/tct