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Table 2 Calculated PTV margin based on Van Herk formula (2.5 SD of systematic error +0.7 SD of random error)

From: Prostatic displacement during extreme hypofractionated radiotherapy using volumetric modulated arc therapy (VMAT)

  Right-left (mm) Superior-inferior (mm) Anterior-posterior (mm)
pHART7 and 8 30 patients (VMAT) 2.55 3.16 3.86
pHART6 25 patients (IMRT) 2.29 3.16 4.57
Previous Study* (7Gy per fraction) IMRT 1.40 4.40 5.20
  1. *H. Quon et al. Clinical Oncology, Vol. 24, pp. 640-645, 2012.