MRI results
| General quality | Patients and volunteers=59 | ||
| Successful MRI (n/%) | 57/97 | ||
| Quality static images (n/%) | Bad 0/0.0 | ||
| Fair 2/3.5 | |||
| Moderate 8/14.0 | |||
| Good 35/61.4 | |||
| Excellent 12/21.1 | |||
| Quality dynamic images (n/%) | Bad 2/3.5 | ||
| Fair 5/8.8 | |||
| Moderate 6/10.5 | |||
| Good 40/70.2 | |||
| Excellent 4/7.0 | |||
| Artefacts (n/%) | None 38/66.7 | ||
| Coil 12/21.1 | |||
| General motion 6/10.5 | |||
| Respiratory motion 1/1.8 | |||
| Static | Patients=47† | Volunteers=10 | P value |
| Vocal cord thickening (n/%) | 38/80.9 | 1/10 | |
| Abnormal vocal cord positioning (n/%) | 10/21.3 | 1/10 | |
| Vocal cords | |||
| Area (mm2) | 22.0 (17.7–30.3) | 35.1 (21.2–54.7) | 0.03* |
| AP diameter (mm) | 8.4±2.0 | 9.0±2.3 | 0.37 |
| Transversal diameter (mm) | 2.8±1.0 | 3.8±1.2 | 0.01* |
| Cricoid† | |||
| Area (mm2) | 62.3±27.0 | 66.2±34.8 | 0.70 |
| AP diameter (mm) | 8.4±2.0 | 9.8±2.1 | 0.05 |
| Transversal diameter (mm) | 6.3±1.4 | 5.7±0.8 | 0.16 |
| Presence of tracheal deformation (n/%) | 25/53.2 | 0/0 | |
| Tracheal deformation | |||
| Area (mm2) | 28.6 (20.8–41.9) | – | |
| AP diameter (mm) | 6.6±1.7 | – | |
| Transversal diameter (mm) | 4.4±1.1 | – | |
| Proximal trachea | |||
| Area (mm2) | 61.0 (39.9–83.3) | 86.1 (41.5–130.1) | 0.19 |
| AP diameter (mm) | 7.3±1.5 | 8.1±2.1 | 0.16 |
| Transversal diameter (mm) | 7.3±1.6 | 8.2±1.3 | 0.10 |
| Area decrease at deformation (area deformation/area trachea,%) | 37.5±23.5 | – | – |
| Dynamic | |||
| Complete abduction during inspiration (n/%) | 27/57.4 | 10/100 | 0.01* |
| Complete adduction during phonation (n/%) | 18/38.3 | 10/100 | <0.01* |
| 2D | Patients=35† | Volunteers=9 | |
| Inspiration areas (mm2 ) | |||
| Vocal cords | 43.7±22.7 | 72.9±42.3 | 0.01* |
| Cricoid | 67.5±26.9 | 84.3±42.4 | 0.15 |
| Tracheal deformation | 38.4±13.7 | – | – |
| Trachea | 79.5±28.5 | 104.2±50.5 | 0.07 |
| Phonation areas (mm2 ) | |||
| Vocal cords | 10.9±9.3 | 7.2±4.7 | 0.26 |
| Cricoid | 65.6±30.4 | 90.5±44.4 | 0.06 |
| Tracheal deformation | 46.9±16.7 | – | – |
| Trachea | 77.0±27.7 | 105.2±49.9 | 0.03* |
| Difference in areas (%) | |||
| Vocal cords | −72.1±23.7 | −88.9±7.3 | 0.04* |
| Cricoid | −7.5 (−22.7–6.0) | −5.5 (−0.4–19.0) | 0.02* |
| Tracheal deformation | 27.0±41.8 | – | – |
| Trachea | −3.4 (−10.4–8.0) | 2.2 (−4.6–10.5) | 0.21 |
Data are presented as mean±SD, median (IQR) or absolute numbers (n) and percentages. All areas and diameters are corrected for height in metres.
*P<0.05, data are corrected for height in metres.
†Cricoid measurements conducted in n=43 for static and n=33 for dynamic images, due to exclusion of patients with history of CTR.
AP, anterior–posterior; CTR, cricotracheal reconstruction; 2D, two dimensional.