Skip to main content

Table 2 Dosimetric distribution of PTV + 6 and OAR in CK SRS SLP and MLP for 50 patient

From: Benefit of dosimetry distribution for patients with multiple brain metastases from non-small cell lung cancer by a Cyberknife stereotactic radiosurgery (SRS) system

  SLP mean (range) MLP mean (range) R mean (range) t p
PTV + 6
DMax 89.75%(80.20–93.90%) 89.07%(79.99–92.11%) 0.77%(0.29–1.91%) − 1.00 0.04
Dmean 54.69%(46.54–65.02%) 53.18%(45.34–63.79%) 2.34%(1.89–2.58%) 2.10 0.03
DMin 35.46%(29.65–43.55%) 33.82%(28.36–39.64%) 4.62%(4.35–8.98%) 5.40 <0.01
Brainstem
DMax 21.57%(18.15–23.76%) 21.02%(18.49–23.04%) 2.62%(0.22–3.13%) 2.15 0.03
Dmean 11.49%(5.27–20.68%) 10.85%(4.45–20.12%) 5.57%(2.71–12.56%) 1.18 <0.01
Optic Nerve
DMax 14.10%(4.56–18.85%) 13.56%(4.44–18.57%) 2.63%(1.49–3.83%) 3.66 0.02
Dmean 7.16%(5.18–10.02%) 6.88%(4.52–9.35%) 6.91% (3.69–12.74%) −5.28 <0.01
Optic Chiasm
DMax 14.90%(7.53–21.05%) 14.41%(7.47–19.93%) 3.29% (0.80–5.32%) −3.77 0.04
Dmean 6.08%(3.21–8.96%) 5.92%(2.95–8.83%) 5.63% (1.45–8.10%) 6.07 <0.01
  1. PTV + 6 was 6-mm-thick zones of healthy brain tissue adjacent the PTVs, DMax, Dmean and DMin were maximum dose, mean dose and minimum dose, expressed as percent of the global maximum dose in plans
\