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Table 2 Magnitude (cm) of interfraction GTV centroid motion for the tenth fraction 4DCT scan

From: Detection of interfraction displacement and volume variance during radiotherapy of primary thoracic esophageal cancer based on repeated four-dimensional CT scans

Group LR AP SI F P 3D vector
Range Mean SD Range Mean SD Range Mean SD Range Mean SD
Upper 0.01-0.35 0.13 0.11 0.01-0.26 0.13 0.09 0.01-0.65 0.31 0.25 3.745 0.038 0.03-0.78 0.39 0.23
Mid- 0.02-0.32 0.14 0.10 0.01-0.46 0.15 0.13 0.01-0.75 0.33 0.23 3.806 0.034 0.05-0.77 0.41 0.23
Distal 0.01-0.17 0.14 0.04 0.08-0.50 0.21 0.13 0.13-0.87 0.51 0.25 13.672 0.000 0.25-0.89 0.59 0.22
F 0.168 0.892 3.681    3.251
P 0.846 0.421 0.038    0.048
  1. Abbreviation: GTV gross tumor volume, 4DCT four-dimensional computed tomography, LR right–left, AP anterior–posterior, SI superior–inferior, 3D three-dimensional, SD standard deviation; “F”, the ratio of mean square about “between groups” and “within groups” used by one-way ANOVA; “P” , the significance based on two-tailed p values. Values of P < 0.05 were considered significant.