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Table 1 Dosimetric comparison between VMAT_AVD and 3D-CRT

From: Pediatric craniospinal irradiation with a short partial-arc VMAT technique for medulloblastoma tumors in dosimetric comparison

Technique

VMAT_AVD

3D-CRT

Diff. abs

 

OARs

Dmean [range]

Dmean [range]

Δ in Gy

Ratio in %

Heart

6.6 [5.8–7.0]

16.0 [13.7–18.5]

− 9.4

41.3

Thyroid

8.7 [7.6–9.9]

27.1 [24.9–29.5]

− 18.4

32.1

Lungs

7.5 [7.0–7.9]

4.2 [2.8–5.3]

3.3

178.6

Kidneys

5.3 [4.7–5.8]

2.6 [1.7–3.9]

2.7

203.8

Liver

5.7 [5.2–6.3]

4.8 [4.7–7.4]

0.9

118.8

Breast

2.4 [2.0–3.2]

2.1 [1.4–2.4]

0.3

114.3

Spinal cord

35.5 [35.2–35.9]

35.3 [34.9–35.8]

0.2

100.6

Body outline

11.5 [9.9–12.7]

11.1 [8.5–13.2]

0.4

103.6

Gonadsa

1.9 [0.4–4.3]

8.0 [1.3–25.1]

− 6.1

23.8

Gonads Dmax

3.9 [0.7–10.4]

17.5 [3.5–28.6]

− 13.6

17.1

  1. VMAT_AVD volumetric modulated arc therapy with avoidance sectors, 3D-CRT 3D-conformal radiotherapy, Diff. abs. absolute dose difference, Dmean mean dose in Gy, Dmax maximum dose in Gy
  2. aThe localization for the ovaries is uncertain due to lack of MRT data; therefore it is rather a rough indication