Table 3.
Sensitivity of the parameters for the positional features algorithm measured by relative displacement of the origin of the coordinate system: k is the default parameter value multiplicator.
| Error [mm] | |||||||
|---|---|---|---|---|---|---|---|
| k | 25% | 50% | 75% | 100% | 125% | 150% | 175% |
| Param (default value) | Reference | ||||||
| SB (3 [mm]) | 3.3002 | 2.7002 | 3.3002 | 0.0 | 10.5750 | 19.7250 | 24.9750 |
| TB (−300 [HU]) | 80.2767 | 39.3823 | 10.9500 | 0.0 | 3.1501 | 3.9002 | 3.5253 |
| TS (320 [HU]) | 77.9674 | 41.8941 | 31.0902 | 0.0 | 24.7194 | 42.3552 | 65.1209 |
| SS (100 × 15 × 15 [mm]) | 28.8292 | 22.3974 | 10.0019 | 0.0 | 21.7733 | 28.1594 | 31.8916 |
| TLA (−200 [HU]) | 88.2000 | 25.4250 | 0.3750 | 0.0 | 0.6750 | 0.7500 | 1.2750 |
| DBA (1 [mm]) | 0.0000 | 0.0000 | 0.0000 | 0.0 | 0.0000 | 0.2250 | 0.2250 |
| DSA (30 [mm]) | 0.6750 | 0.6000 | 0.4500 | 0.0 | 2.7000 | 3.2250 | 5.1000 |
The k = 100% is used as a reference origin point. SB and TB are parameters sigma and threshold for body extraction. TS and SS are parameters for spine extraction. TLA, DBA, and DSA are parameters for axial plane extraction.