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The system was tested on the remaining 1000 cases. For each institution, linear regression was applied to calculate the correlation coefficients between HU and phantom density. The source code and the model used for phantom segmentation can be accessed at https//github.com/keisuke-uemura/CT-Intensity-Calibration-Phantom-Segmentation . The median Dice coefficient was 0.977, and the median average symmetric surface distance was 0.116mm. The median absolute difference of the segmented regions between manual and automated segmentation was 0.