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Table 4 Variation of tumor volume during radiotherapy(cm3,mean ± SD,)

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

Group GTVmean IGTVMIP IGTV10
Simulation Tenth Twentieth Simulation Tenth Twentieth Simulation Tenth Twentieth
Upper 14.82 ± 10.22 12.15 ± 7.15 11.24 ± 10.17 15.5 ± 10.00 12.84 ± 7.61 11.84 ± 10.37 19.95 ± 14.30 16.44 ± 10.44 16.89 ± 18.41
Mid- 33.63 ± 17.15 29.63 ± 17.39 24.21 ± 13.25 35.18 ± 18.29 31.16 ± 18.22 25.33 ± 13.90 42.40 ± 21.18 37.86 ± 21.46 31.69 ± 16.49
Distal 22.04 ± 8.67 20.92 ± 8.69 17.69 ± 7.43 23.10 ± 8.67 21.96 ± 9.18 18.70 ± 7.81 29.68 ± 11.09 27.90 ± 12.57 23.98 ± 10.40
Total 25.08 ± 15.53 22.35 ± 14.59 17.95 ± 11.75 26.25 ± 16.07 23.62 ± 15.33 18.87 ± 12.23 32.51 ± 19.10 28.88 ± 18.30 24.47 ± 16.36
  1. Abbreviation: GTV gross tumor volume, IGTV internal gross tumor volume, MIP maximum intensity projection, simulation the simulation 4DCT scan, tenth the tenth 4DCT scan, twentieth the twentieth 4DCT scan.