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The normalized intensity of the image background in reference to the aluminum step wedge thickness. The intensity of each of the materials was normalized to the measured background intensity of the X-ray images used.
| Material | Phoenix VTOMEX L 300 | Toshiba Aquilion |
|---|---|---|
| Two-layer aluminum | 0.95 | 0.98 |
| Two-layer copper | 0.85 | 0.93 |
| Six-layer copper | 0.57 | 0.83 |
