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Table 1 The range, mean and standard deviation (SD) of the target motion represented by the movement of the centroid of the clips in free breathing and breath-hold conditions

From: Incorporating breath holding and image guidance in the adjuvant gastric cancer radiotherapy: a dosimetric study

   SI(mm) LR (mm) AP (mm)
Free breathing Max 20.0 5.8 12.5
Min 2.8 0.8 2.2
Mean 11.1 1.9 5.5
SD 3.1 1.0 2.5
Margin 20.4 4.9 13.0
Breath hold Max 10.1 3.5 8.1
Min 1.0 0.3 0.8
Mean 3.7 1.6 2.8
SD 2.0 0.8 1.7
  Margin 9.7 5.0 7.9
  1. The margin for target motion was calculated using three times of the SD. All data are calculated from the entire group of the patients.