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Table 5 Reduction of tumor movement in the upper and the lower lung field

From: Stereotactic body radiotherapy for stage I lung cancer and small lung metastasis: evaluation of an immobilization system for suppression of respiratory tumor movement and preliminary results

  Craniocaudal direction Right-to-left direction
  Upper lung field Upper lung field
  B – C† B – D† C – D† B – C† B – D† C – D†
≤ - 3 mm 0 0 1 0 0 0
- 2 ≤, ≤ 2 mm 24 24 28 27 27 29
≥ 3 mm 5 5 0 2 2 0
p* 0.0044 0.0046 - 0.024 0.029 0.71
  Lower lung field Lower lung field
  B – C† B – D† C – D† B – C† B – D† C – D†
≤ - 3 mm 2 2 3 0 0 0
- 2 ≤, ≤ 2 mm 14 14 19 24 22 26
≥ 3 mm 10 10 4 2 4 0
p* 0.032 0.0071 0.48 0.016 0.0051 0.043
  1. p*: Paired t-test for mean values of tumor movement.
  2. X – Y†: Amplitude of tumor movement in condition X minus that in condition Y.