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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