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Table 3 Difference in cm3 between target volume in planning CT and last control CT. Positive (negative) values correspond to volume reduction (increase). Patients who underwent plan adaptation are marked by*

From: Impact of robust treatment planning on single- and multi-field optimized plans for proton beam therapy of unilateral head and neck target volumes

Patient Volume change (cm3)
Low-risk CTV High-risk CTV
1 8.11 −0.03
2* 3.98 2.19
3* 18.25 5.54
4 −1.97 −0.94
5* 7.79 2.27
6* −6.60 4.46
7 7.61 5.76
8 −3.23 −1.41