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An example of large dose deviations due to deformation. Left: patient was planned and on exhale CT for 30 Gy with abdominal compression (liver=purple; GTV=red). Middle: deformation in the abdomen shown on CBCT was possibly due to a misaligned compression plate and increased stomach contents. Right: differences between the accumulated and predicted dose (Dacc–Dpred) showing decreases (dark blue region) to the minimum GTV of 4.3 Gy, and the maximum duodenum by 11.5 Gy.
