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Table 2 Summary of the dosimetric parameters

From: Radiation-induced liver disease after stereotactic body radiotherapy for small hepatocellular carcinoma: clinical and dose-volumetric parameters

Variables

 

Normal liver volume (cm3)

 

  Median (Range)

1159.2 (488.3–1907.1)

  Mean ± SD

1169.2 ± 266.7

GTV (cm3)

 

  Median (Range)

8.6 (0.6–125.3)

  Mean ± SD

15.9 ± 19.3

PTV (cm3)

 

  Median (Range)

40.8 (11.9–296.9)

  Mean ± SD

57.7 ± 50.0

Dose (Gy/number of fractions)

 

  30 / 3 – 40 / 4

31 (33.7%)

  45 / 3 – 48 / 4

38 (41.3%)

  60 / 3 – 60 / 4

23 (25.0%)

No. of ports

 

  Median (Range)

7 (5–9)

Mean liver dose (Gy)

 

  Median (Range)

8.3 (1.2–20.4)

  Mean ± SD

8.7 ± 3.7

D33%* (Gy)

 

  Median (Range)

7.3 (0.31–28.4)

  Mean ± SD

8.4 ± 5.1

D50% (Gy)

 

  Median (Range)

3.9 (0.2–16.3)

  Mean ± SD

4.6 ± 3.7

  1. Abbreviations: SD standard deviation, GTV gross tumor volume, PTV planning target volume.
  2. *Dose to 33% of the normal liver.
  3. Dose to 50% of the normal liver.