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Table 1 Comparison of dosimetric parameters for irradiation of portal vein thrombosis and target volumes and normal organs at risk (OARs) by using different treatment techniques.

From: Comparison of coplanar and noncoplanar intensity-modulated radiation therapy and helical tomotherapy for hepatocellular carcinoma

   Coplanar IMRT Noncoplanar IMRT Tomotherapy
CTV V95% (%) 98.72 ± 1.90 99.98 ± 0.02 99.97 ± 0.07
PTV V90% (%) 99.44 ± 1.07 99.54 ± 0.61 99.84 ± 0.17
  V95% (%) 98.83 ± 0.74 98.71 ± 1.28 99.17 ± 0.64
  UI 1.10 ± 0.02 1.11 ± 0.03 1.04 ± 0.02#,*
  CI 1.16 ± 0.07 1.14 ± 0.06 1.13 ± 0.04
Normal liver V10 (%) 64.81 ± 17.86 51.91 ± 21.56 72.51 ± 13.31*
  V20 (%) 41.36 ± 13.99 32.62 ± 14.95 32.78 ± 9.18
  V30 (%) 21.10 ± 7.90 17.17 ± 8.85 17.00 ± 6.10
  mean (Gy) 18.23 ± 3.11 16.14 ± 4.61 17.93 ± 2.83
Stomach mean (Gy) 11.68 ± 5.47 9.90 ± 6.18 13.19 ± 6.05
Right Kidney mean (Gy) 5.07 ± 4.99 6.32 ± 5.08 9.00 ± 8.94
Left Kidney mean (Gy) 2.1 ± 3.03 2.36 ± 2.91 5.00 ± 5.27
Spinal cord D1% (Gy) 20.98 ± 7.51 20.12 ± 9.08 22.53 ± 3.31
  1. The Vx is the percentage of normal liver volume that receives ≥ × Gy in the total normal liver volume.
  2. V90 and V95 mean volume covered by 90% and 95% of prescribed dose, respectively.
  3. UI: Uniformity index; CI: Conformal index.
  4. #: The p value is < 0.05 for comparing tomotherapy with coplanar IMRT.
  5. *: The p value is < 0.05 for comparing tomotherapy with noncoplanar IMRT.