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. 2021 Nov 20;20:82–87. doi: 10.1016/j.phro.2021.11.002

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© 2021 The Authors

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 1 — Illustration of the LoP strategy and the two MRgRT strategies (MRgRT_30min and MRgRT_15min). 1) illustrates the LoP strategy. a) The bladder was delineated on the planning CT and two PTVs were constructed (PTV LoP Tight and PTV LoP Wide). b) Based on Bladder₁ the most suitable PTV was selected (in this case PTV LoP Wide). c) MRI₂ was considered the simulated post-treatment image. Evaluation of PTV LoP Selected was done with Bladder₂. 2) illustrates the MRgRT_30min workflow. d) A PTV was constructed from Bladder₁ with population-based margins. e) This PTV was evaluated with the MRI₃ as simulated post-treatment image using Bladder₃. 3) illustrates the MRgRT_15min workflow. f) Similar to the MRgRT_30min, a PTV was constructed from Bladder₁. g) Evaluation was now done with MRI₂ as simulated post-treatment image using Bladder₂.