Introduction
Materials and methods
Study design and population
Image acquisition
Image analysis
Statistical analysis
Results
Interobserver agreement
WB-CT | ICC between experienced observers (95% confidence interval) | ICC between junior observers (95% confidence interval) |
---|---|---|
Cervical spine | 0.42 (0.04–0.70) | 0.36 (scale not reliable–0.72) |
Thoracic spine | 0.46 (0.06–0.74) | 0.30 (scale not reliable–0.70) |
Lumbar spine | 0.56 (0.16–0.80) | 0.58 (scale not reliable–0.83) |
Pelvis | 0.90 (0.78–0.96) | 0.83 (0.52–0.93) |
Long bones | 0.35 (scale not reliable–0.66) | 0.63 (0.10–0.85) |
Skull | 0.41 (0.01–0.70) | 0.52 (scale not reliable–0.80) |
Rib and other bones | 0.79 (0.56–0.91) | 0.56 (scale not reliable–0.82) |
Whole skeleton | 0.77 (0.45–0.91) | 0.72 (0.34–0.88) |
WB-MRI | ICC between experienced observers (95% confidence interval) | ICC between junior observers (95% confidence interval) |
---|---|---|
Cervical spine | 0.90 (0.79–0.96) | 0.74 (0.38–0.89) |
Thoracic spine | 0.90 (0.78–0.96) | 0.68 (0.25–0.86) |
Lumbar spine | 0.89 (0.75–0.95) | 0.80 (0.53–0.92) |
Pelvis | 0.99 (0.97–0.99) | 0.98 (0.95–0.99) |
Long bones | 0.92 (0.81–0.96) | 0.89 (0.74–0.95) |
Skull | 0.89 (0.76–0.95) | 0.72 (0.35–0.88) |
Rib and other bones | 0.92 (0.81–0.97) | 0.91 (0.78–0.96) |
Whole skeleton | 0.98 (0.96–0.99) | 0.95 (0.73–0.98) |
Observer scores for disease burden assessment
WB-CT | CB-MRI | |||||
---|---|---|---|---|---|---|
Median scores | IQR | Median scores | IQR | Z | p value | |
Cervical spine | 0 | 0–2 | 0 | 0–0 | − 1.51 | 0.13 |
Thoracic spine | 0 | 0–2 | 0 | 0–2 | − 0.36 | 0.72 |
Lumbar spine | 0 | 0–2 | 0 | 0–2 | − 0.32 | 0.75 |
Pelvis | 1.5 | 0–4.25 | 1 | 0–4 | − 0.39 | 0.70 |
Long bones | 0 | 0–0 | 0 | 0–3 | − 2.56 | 0.01 |
Skull | 0 | 0–0.5 | 0 | 0–0 | − 0.53 | 0.60 |
Rib and other bones | 0 | 0–4 | 0 | 0–4 | − 0.68 | 0.50 |
Whole skeleton | 5 | 0–13 | 4 | 1.5–8.25 | − 0.42 | 0.67 |
Region | Correlation coefficient (Spearman’s rho) | p value |
---|---|---|
Cervical spine | 0.36 | 0.10 |
Thoracic spine | 0.25 | 0.56 |
Lumbar spine | 0.81 | < 0.01 |
Pelvis | 0.39 | 0.71 |
Long bones | 0.58 | < 0.01 |
Skull | 0.33 | 0.13 |
Rib and other bones | 0.61 | < 0.01 |
Whole skeleton | 0.61 | < 0.01 |