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Table 1 The comparison of central-axis dose values (in Gy) for a 16 mm COMS plaque loaded with 125I seeds (model 6711) calculated in our in-house program with those in three commercial treatment planning systems (TPS) in Rivard et al.’s study

From: A practical approach to estimating optic disc dose and macula dose without treatment planning in ocular brachytherapy using 125I COMS plaques

d (mm)

CAX points

Current Study

Data from Table II in Rivard et al. [15]

Max\( \left|{\mathrm{D}}_{\mathrm{diff}}^{\mathrm{Rel}}\left(\%\right)\right| \)

P3

BV

PS

−1.0

Outer sclera

336.18

341

340

339

1.41

0.0

Inner sclera

258.79

261

261

260

0.85

1.0

 

202.10

203

203

202

0.44

2.0

 

160.48

161

161

160

0.32

3.0

 

128.68

129

129

128

0.53

4.0

 

103.91

104

104

103

0.88

5.0

Rx depth

84.52

84.4

84.5

83.9

0.74

6.0

 

69.26

69.2

69.2

68.8

0.67

7.0

 

57.27

57.2

57.2

56.9

0.65

8.0

 

47.73

47.7

47.7

47.4

0.70

9.0

 

40.12

40.0

40.0

39.8

0.81

10.0

 

34.00

33.9

33.9

33.7

0.89

11.3

Eye center

27.73

27.6

27.6

27.5

0.83

15.0

 

16.45

16.3

16.3

16.3

0.95

20.0

 

9.02

8.87

8.89

8.84

2.04

22.6

Opposite retina

6.83

6.70

6.70

6.67

2.35

  1. P3, BV and PS represent Pinnacle, BrachyVision and Plaque Simulator, respectively. Dose values were calculated for a prescribed dose of approximately 85 Gy to a central-axis depth of 5 mm (Sk = 4.752 U and irradiation time = 100 h) using a line source approximation of the AAPM TG-43 formalism and homogeneous water phantoms. Max\( \left|{\mathrm{D}}_{\mathrm{diff}}^{\mathrm{Rel}}\left(\%\right)\right| \) is the largest modulus of relative percent differences in dose between the two studies