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Corresponding axial CT slices from the beginning and the end of
treatment.
The volume of the PTV changed from 606 to 336 cm3 over treatment, a
decrease of 45%.
Spinal cord D05 differed from the planned value by 3.5 +/- 9.8%
Mechalakos J et al. Med Dosim. 2009 Fall;34(3):250-5.