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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.