Of the three patients who did not show a decrease in PTVlow, two were rescanned after 25 fractions, meaning that PTVlow was not delineated, and the volume remained the same (as a result, we eliminated them when evaluating the correlation of PTV decrease with the number of fractions after which the rescan was performed), while the other patient showed an almost insignificant volume difference of about 1 cm 3 .
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Adaptive Radiotherapy in Head and Neck Cancer Using Volumetric Modulated Arc Therapy.
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