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Table 3 Comparison of MCNP calculations by treatment method.

From: Novel low-kVp beamlet system for choroidal melanoma

 

MCNP Eye-plaque

MCNP BLOKX

 
 

Location

Dose (Gy)

Location

Dose (Gy)

Difference (%) *

Tumor 90° from macula

Base

338.6

Base

101.8

69.9

 

Apex

85.0

Apex

85.0

0.0

 

Macula

11.0

Macula

1.5

86.0

 

Optic Nerve

5.5

Optic Nerve

1.6

71.0

 

Lens

11.0

Lens

3.3

69.7

Tumor 60° from macula

Base

338.2

Base

87.1

74.2

 

Apex

85.0

Apex

85.0

0.0

 

Macula

20.2

Macula

3.1

84.4

 

Optic Nerve

11.1

Optic Nerve

1.2

89.4

 

Lens

7.9

Lens

2.4

70.3

Tumor 45° from macula

Base

335.3

Base

85.0

74.7

 

Apex

85.0

Apex

93.1

-9.5

 

Macula

39.3

Macula

51.0

-29.7

 

Optic Nerve

15.7

Optic Nerve

1.8

88.4

 

Lens

6.8

Lens

3.6

46.7

Tumor 45°R* from macula

Base

335.3

Base

85.0

74.7

 

Apex

85.0

Apex

112.0

-31.7

 

Macula

39.3

Macula

4.0

89.8

 

Optic Nerve

15.7

Optic Nerve

2.9

81.7

 

Lens

6.8

Lens

7.1

-4.0

Tumor 30° from macula

Base

335.5

Base

85.0

74.7

 

Apex

85.0

Apex

99.1

-16.6

 

Macula

152.9

Macula

70.4

53.9

 

Optic Nerve

16.9

Optic Nerve

3.0

82.4

 

Lens

5.6

Lens

4.7

16.9

Tumor 270° from macula

Base

338.1

Base

102.8

69.6

 

Apex

85.0

Apex

85.0

0.0

 

Macula

11.0

Macula

3.2

71.2

 

Optic Nerve

14.7

Optic Nerve

2.9

80.4

 

Lens

12.8

Lens

1.8

85.8