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Table 3 Planning target volume margins in each translational direction

From: Evaluation of inter-fraction and intra-fraction errors during volumetric modulated arc therapy in nasopharyngeal carcinoma patients

  ML (mm) SI (mm) AP (mm)
Initial inter-fraction 4.0 3.1 3.1
Residual inter-fraction 1.5 1.7 1.6
Intra-fraction 0.9 1.4 1.5
Total without CBCT correction 4.1 3.4 3.5
Total with CBCT correction 1.7 2.2 2.2
  1. ML, medial–lateral; SI, superior–inferior; AP, anterior–posterior; CBCT, cone beam computed tomography.