Imaging for Physicists

Margins versus amplitude

3

Mean + Bone ITV + Bone ITV + Tumour Mean + Tumour

2.5

2

1.5

1

Margin [cm]

0.5

0

0

0.5

1

1.5

2

2.5

3

Tumor Amplitude [cm]

σ 7.0 5.2 σ p ≈ 6.4 mm Assures 80% isodose encompasses GTV 90% of time in lung σ 84.0 ) ( 84.0 5.2 2 2 2 − + σ σ +Σ ≠ +Σ = p p M