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Table 4 Brachial plexus dose change (cm3) due to important shifts.

From: Assessment of shoulder position variation and its impact on IMRT and VMAT doses for head and neck cancer

 

Patient 1

Patient 2

Patient 3

Shift

IMRT

VMAT

IMRT

VMAT

IMRT

VMAT

3 mm inferior

      

   Max DVH dose (cGy)

-1

-3

116

12

45

-29

   Max 0.1 cm3 (cGy)

0

40

100

45

40

60

   V60 (cm3)

0

0

0

0

0

0

15 mm inferior

      

   Max DVH dose (cGy)

49

372

203

186

218

259

   Max 0.1 cm3 (cGy)

60

410

205

195

210

240

   V60 (cm3)

1

3

0

0

0

1

3 mm anterior

      

   Max DVH dose (cGy)

-1

0

22

1

23

-14

   Max 0.1 cm3 (cGy)

0

0

15

5

20

-20

   V60 (cm3)

0

0

0

0

0

0

15 mm anterior

      

   Max DVH dose (cGy)

-1

1

125

10

109

-64

   Max 0.1 cm3 (cGy)

0

0

100

0

100

-70

   V60 (cm3)

0

0

0

0

0

0

  1. The changes in maximum dose displayed on the dose volume histogram (DVH), maximum dose to 0.1 cm3, and volume receiving 60 Gy (V60) are shown. Inferior shifts show the greatest increase in dose to the brachial plexus for both intensity-modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT) plans.