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Contrast-to-Noise Ratios.
| Helical Scan | Axial Scan | ||||||
|---|---|---|---|---|---|---|---|
| No shielding | Shielding | % Decrease | No shielding | Shielding | % Decrease | ||
| Large breast | LAD | 10.5 | 8.5 | 19.1 | 9.9 | 7.2 | 27.6 |
| LCx | 12.3 | 9.5 | 22.5 | 9.9 | 9.0 | 9.6 | |
| RCA | 13.1 | 11.1 | 14.8 | 12.4 | 9.0 | 27.1 | |
| Medium breast | LAD | 11.4 | 9.1 | 20.2 | 10.1 | 8.0 | 20.5 |
| LCx | 11.7 | 10.1 | 13.6 | 11.9 | 9.4 | 21.2 | |
| RCA | 12.4 | 8.7 | 29.2 | 10.5 | 7.9 | 24.3 | |
