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Pearson correlation between CTV reduction and BMI or initial tumor mass, between GTV and ADC or initial tumor mass. (a): Correlation between BMI and CTV reduction; (b): correlation between initial tumor mass and CTV reduction; (c): correlation between pre-treatment tumor ADC and GTV reduction; (d): correlation between initial tumor mass and GTV shrinkage. CTV: clinical target volume; GTV: gross target volume; BMI: body mass index; ADC: apparent diffusion coefficient.
