Esophageal tumors show large motion in cranio-caudal direction, with a Peak-to-Peak (P-t-P) range of 2.7 to 24.5mm. In case the motion of the tumor could be followed during radiotherapy treatment, this would enable treatment margin reduction. It is researched whether the motion of the diaphragm is correlated with the breathing motion and drift we can detect in esophageal tumors since it could function as surrogate for tumor motion during treatment. A high correlation was found between both motion patterns and correction of the tumor motion using the diaphragm drift resulted on average in a reduction in P-t-P motion in all patients.
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