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Table 4 The dosimetric comparisons of QI between HT and SaS-IMRT plans

From: Helical tomotherapy for single and multiple liver tumours

Variables of OARs QI-1 QI-2 QI-whole cohort
QI of parallel organ    
   Normal Liver 0.95 ± 0.20 (0.61-1.30) 0.90 ± 0.14 (0.76-1.21) 0.93 ± 0.17 (0.61-1.30)
QI of serial organ    
   SC 0.86 ± 0.47 (0.16-1.45) 0.83 ± 0.30 (0.56-1.52) 0.85 ± 0.38 (0.16-1.52)
   GIS 0.91 ± 0.23 (0.64-1.36) 0.95 ± 0.12 (0.75-1.11) 0.93 ± 0.18 (0.64-1.36)
  1. Abbreviation: HT: Helical tomotherapy; SaS-IMRT: Step-and-shoot intensity-modulated radiotherapy; QI: Quality index; QI-1: QI-single tumour group; QI-2: QI-multiple tumours group; SC: Spinal cord; GIS: Gastrointestinal system (including stomach and small bowels);