Table 3.
A measured film PDD curve and a TPS PDD curve were generated for both current IROC‐Houston's phantom materials and testing materials for a large (10 × 10 cm2), medium (6 × 6 cm2), and small (3 × 3 cm2) field size. For each material (compress cork, petroleum/Styrofoam mixture, polystyrene, Clear Ballistic Gel #20, and M‐F manufacture's liquid PVC plastic), the maximum deviation between the material's measured PDD and TPS PDD and the overall mean deviation between 0.5 cm to 17 cm were recorded
| Materials | 10 × 10 cm2 | 6 × 6 cm2 | 3 × 3 cm2 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Maximum deviation | Depth (cm) | Mean deviation | Maximum deviation | Depth (cm) | Mean deviation | Maximum deviation | Depth (cm) | Mean deviation | |
| Compress cork | 4.3 | 8.5 | 1.9 ± 1.12 | 5.1 | 15.5 | 2.0 ± 1.24 | 12.2 | 17.0 | 3.8 ± 3.60 |
| Petroleum/styrofoam mix | 7.7 | 15.0 | 1.9 ± 2.04 | 7.2 | 13.5 | 2.8 ± 2.26 | 10.8 | 16.5 | 5.9 ± 2.75 |
| Polystyrene | 5.7 | 17.0 | 1.8 ± 1.67 | 2.5 | 16.0 | 1.1 ± 0.59 | 7.1 | 16.5 | 1.9 ± 2.02 |
| Clear ballistic Gel #20 | 1.9 | 15.0 | 0.6 ± 0.46 | 3.3 | 14.5 | 1.2 ± 0.81 | 4.1 | 12.5 | 1.5 ± 1.15 |
| M‐F manufacture liquid PVC plastic | 3.7 | 16.5 | 1.2 ± 1.03 | 4.5 | 11.0 | 1.7 ± 1.21 | 4.6 | 17.0 | 2.0 ± 1.13 |