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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

From: Upright, prone, and supine spinal morphology and alignment in adolescent idiopathic scoliosis

  Cobb angle
Upright X-ray Prone CT scan Supine MRI
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 (°)