Table 2.
Initial air-kerma strength per seed (U/seed) per prescription dose (100 Gy) for different configurations of 125I and 103Pd seeds. (TG-43)sim is calculated source strength based on AAPM TG-43 U1 protocol (in water environment) versus source strength modified by authors based on actual 3D lung environment.
| Configuration | Row Spacing (cm) | Initial source strength (U/prescription dose) | ||||||
|---|---|---|---|---|---|---|---|---|
| 103Pd (200) | 125I (6711) | |||||||
| (TG-43)Sim | Modified by Authors | %Diff (Rounded) | (TG-43)Sim | Modified by Authors | %Diff (Rounded) | |||
| I | (4 × 10) | 1.5 | 5.04 | 2.88 | -42 % | 0.75 | 0.61 | -18 % |
| II | (4 × 10) | 1.3 | 4.24 | 2.53 | -40 % | 0.67 | 0.56 | -16 % |
| III | (5 × 10) | 1.0 | 3.03 | 1.90 | -37 % | 0.48 | 0.41 | -15 % |
| IV | (6 × 10) | 0.8 | 2.50 | 1.58 | -36 % | 0.39 | 0.33 | -16 % |