Table 2. CTA adapted Leaman score weighing factors.
| Segments | Dominance | ||
|---|---|---|---|
| Right dominance | Left dominance | Balanced | |
| Proximal RCA | 1.0 | 0 | 0.5 |
| Mid RCA | 1.0 | 0 | 0.5 |
| Distal RCA | 1.0 | 0 | 0.5 |
| R-PDA | 1.0 | – | 0.5 |
| R-PLB | 0.5 | – | – |
| Left main | 5.0 | 6.0 | 5.5 |
| Proximal LAD | 3.5 | 3.5 | 3.5 |
| Mid LAD | 2.5 | 2.5 | 2.5 |
| Distal LAD | 1.0 | 1.0 | 1.0 |
| 1st diagonal | 1.0 | 1.0 | 1.0 |
| 2nd diagonal | 0.5 | 0.5 | 0.5 |
| IM | 1.0 | 1.0 | 1.0 |
| Proximal LCX | 1.5 | 2.5 | 2.0 |
| 1st OM | 1.0 | 1.0 | 1.0 |
| Mid-distal LCX | 0.5 | 1.5 | 1.0 |
| 2nd OM | 1.0 | 1.0 | 1.0 |
| L-PDA | – | 1.0 | – |
| L-PLB | – | 0.5 | 0.5 |
| Stenosis severity | |||
| Obstructive | 1.000 | – | – |
| Non-obstructive | 0.615 | – | – |
| Plaque composition | |||
| Non-calcified or partially calcified | 1.5 | – | – |
| Calcified | 1 | – | – |
CTA adapted Leaman-score is calculated by multiplying the weighing factors regarding plaque composition, stenosis severity and location for a given segment. Overall score is calculated by summing up scores for all segments. RCA, right coronary artery; R-PDA, posterior descending artery originating from right coronary; R-PLB, posterolateral branch originating from right coronary; LAD, left anterior descending; IM, intermediate branch; LCx, left circumflex; OM, obtuse marginal; L-PDA, posterior descending artery originating from left coronary; L-PLB, posterolateral branch originating from left coronary.