Table 3 The doses to brain stem and hippocampus. (Plan A: C-VMAT, Plan B: HS-VMAT, PlanC: HS-dMLC).

From: The Hippocampus Sparing Volume Modulated Arc Therapy does not Influence Plan Quality on Locally Advanced Nasopharyngeal Carcinoma Patients

 

Plan A

Plan B

Plan C

P value

mean

mean

mean

 

A Vs B

B VS C

A Vs C

Brain stem

   V10 (%)

97.2

88.1

90.3

0.001

0.001

0.357

0.005

   V20 (%)

74.2

62.3

67.1

0.032

0.01

0.277

0.109

   V30 (%)

50.9

35.8

45.5

0.02

0.006

0.066

0.302

   V40 (%)

24.4

14.4

23.3

0.018

0.01

0.02

0.766

   V50 (%)

5.7

2.8

4.9

0.061

0.022

0.099

0.484

Hippocampus

  Dmean (cGy)

1518

899

896

0.001

0.001

0.978

0.001

  D40% (cGy)

1379

642

639

0.001

0.001

0.987

0.001

   V10 (%)

54.1

25.1

23.8

0.001

0.001

0.796

0.001

   V20 (%)

26.2

12.6

12.0

0.001

0.001

0.886

0.001

   V30 (%)

11.4

5.4

5.2

0.127

0.076

0.952

0.068

   V40 (%)

3.7

2.4

1.8

0.798

0.630

0.848

0.501

   V50 (%)

1.3

1.4

0.9

0.96

0.935

0.847

0.784

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