Abstract
Objective To investigate the correlation between setup error and couch position error in radiotherapy. Methods A total of 25 patients with thoracic and abdominal tumors who recently finished image-guided radiotherapy were randomly selected. The data on couch position during treatment were obtained through the record validation system, and then the couch position error was calculated. The Pearson correlation analysis was used to investigate the correlation between setup error and couch position error during treatment. Results In the ≥5 setup errors among the 25 patients, the correlation coefficient between random setup error and random couch position error was 0.83(P=0.00), and the correlation coefficient between systematic setup error and systematic couch position error was 0.36(P=0.11). Conclusions In radiotherapy, the random setup error is highly correlated with the random couch position error, while a moderate or low correlation exists between the systematic setup error and the systematic couch position error. Key words: Radiotherapy; Setup error; Couch position; Correlation
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