Table 4 For translational purposes, the conversion equations that resulted from the linear correlation analyses of the different parameters between the upright X-ray, prone CT scan, and supine MRI are provided for the thoracic (Th) and lumbar (L) Cobb angles

Cobb angle

Upright X-ray

–

Th: CT (°) = −6.2 + 0.88 * X-ray (°)

L: CT (°) = −2.7 + 0.81 * X-ray (°)

Th: MRI (°) = 2.9 + 0.79 * X-ray (°)

L: MRI (°) = −2.1 + 0.85 * X-ray (°)

Prone CT

Th: X-ray (°) = 16.6 + 0.96 * CT (°)

L: X-ray (°) = 11.1 + 1.00 * CT (°)

–

Th: MRI (°) = 11.0 + 0.85 * CT (°)

L: MRI (°) = 4.9 + 0.92 * CT (°)

Supine MRI

Th: X-ray (°) = 10.8 + 1.01 * MRI (°)

L: X-ray (°) = 9.5 + 0.98 * MRI (°)

Th: CT (°) = −2.8 + 1.00 * MRI (°)

L: CT (°) = 2.6 + 0.86 * MRI (°)

–