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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