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. 2022 Apr 29;22:57–62. doi: 10.1016/j.phro.2022.04.004

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© 2022 The Authors. Published by Elsevier B.V. on behalf of European Society of Radiotherapy & Oncology.

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 — Intrafraction offset distribution comparison between spirometry-based (SB) treatments (red), and surface-guidance (SG) treatments (blue), in superior-inferior (SI), left–right (LR) and anterior-posterior (AP) directions. The vertical axis represents the frequency and was normalized to 1.