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Table 3 Magnitude (cm) of interfraction GTV centroid motion for the twentieth 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 0.04-0.14 0.08 0.04 0.01-0.39 0.13 0.13 0.09-1.30 0.40 0.39 4.405 0.023 0.12-1.30 0.46 0.38
Mid- 0.02-0.34 0.14 0.10 0.01-0.41 0.16 0.14 0.01-0.55 0.37 0.20 3.614 0.041 0.02-0.58 0.42 0.17
Distal 0.01-0.54 0.16 0.10 0.01-0.54 0.31 0.16 0.45-1.66 0.86 0.39 17.919 0.000 0.54-1.67 0.96 0.36
F 3.132 3.565 10.055    9.318
P 0.062 0.044 0.001    0.001
  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.