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Table 2 Summary of dosimetric results for organs at risk (OAR) on the cohort of 13 patients

From: Fractionated stereotactic radiotherapy of benign skull-base tumors: a dosimetric comparison of volumetric modulated arc therapy with Rapidarc® versus non-coplanar dynamic arcs

Organs   Dynamic arc (DA) Rapidarc (RA) p-value
Brainstem D2 % (Gy) 47.4 ± 13.6 47.1 ± 12.0 DA vs RA p = 0.81
Spinal cord D2 % (Gy) 8.9 ± 5.2 1.8 ± 1.9 DA vs RA p = 10–4
Pituitary glanda D2 % (Gy) 23.7 ± 19 28.6 ± 16.5 DA vs RA p = 0.01
  D mean (Gy) 17.3 ± 16 22.2 ± 15.4 DA vs RA p = 0.02
Chiasm D2 % (Gy) 32.7 ± 22.5 29.3 ± 23.4 DA vs RA p = 0.01
Hippocampus D mean (Gy) 16.7 ± 9.2 11.9 ± 5.5 DA vs RA p = 0.006
  D40 % (Gy) 16.2 ± 10.5 9.9 ± 5.7 DA vs RA p = 0.005
Ipsilateral cochlea D2 % (Gy) 39.4 ± 18.0 33.8 ± 13.8 DA vs RA p = 0.008
  D mean (Gy) 35.3 ± 18.0 25.4 ± 9.7 DA vs RA p = 0.008
Controlateral cochlea D2 % (Gy) 12.5 ± 12.3 17.9 ± 8.4 DA vs RA p = 0.05
  D mean (Gy) 10.8 ± 11.1 15.8 ± 7.9 DA vs RA p = 0.04
Cerebellum D mean (Gy) 8.7 ± 7.0 10.7 ± 5.6 DA vs RA p = 0.11
Ipsilateral lens D2 % (Gy) 1.1 ± 1.5 3.1 ± 2.2 DA vs RA p = 0.01
  D mean (Gy) 0.9 ± 1.3 2.4 ± 1.9 DA vs RA p = 0.01
Controlateral lens D2 % (Gy) 1.4 ± 1.9 3.2 ± 2.1 DA vs RA p = 0.01
  D mean (Gy) 1.1 ± 1.5 2.5 ± 1.9 DA vs RA p = 0.01
Ipsilateral optic nerve D2 % (Gy) 26.8 ± 23.1 26.3 ± 22.5 DA vs RA p = 0.83
Controlateral optic nerve D2 % (Gy) 21.7 ± 19.9 24.0 ± 20.6 DA vs RA p = 0.62
Ipsilateral eyeball D2 % (Gy) 4.1 ± 2.9 9.2 ± 4.5 DA vs RA p = 10–4
  D mean (Gy) 0.6 ± 0.9 1.4 ± 1.3 DA vs RA p = 0.09
Controlateral eyeball D2 % (Gy) 3.3 ± 3 10.2 ± 4.9 DA vs RA p = 10–4
  D mean (Gy) 0.2 ± 0.3 1.5 ± 1.4 DA vs RA p = 0.002
Healthy brain (i-e brain-PTV) D mean (Gy) 6.7 ± 2.7 5.1 ± 1.8 DA vs RA p = 0.002
  V100 % (%) 0.4 ± 0.8 0.02 ± 0 DA vs RA p = 0.02
  V95 % (%) 0.9 ± 1.2 0.3 ± 0.2 DA vs RA p = 0.03
  V90 % (%) 1.4 ± 1.4 0.7 ± 0.4 DA vs RA p =0.05
  V80 % (%) 2.2 ± 2.1 1.3 ± 0.7 DA vs RA p =0.06
  1. Data presented the mean doses of all patients ± standard deviation. Bold techniques means that this technique is superior for this organ in particular. Nb Vx% = minimum x% of prescribed dose received by the volume and Dx% is the minimum dose received by x% of the structure volume. aPituitary adenomas treatments excluded