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Fig. 5 | BioMedical Engineering OnLine

Fig. 5

From: Effect of limb rotation on radiographic alignment measurement in mal-aligned knees

Fig. 5

Applying the 3D model of the lower limb reconstructed from CT scanning to set parameters and geometric relations for virtual X-ray capturing. a Three landmarks to determine anatomical planes on the 3D model: the center of the femoral head (FH), the center of ankle joint (AC), and the tip of the greater trochanter (GT). b The schematic diagram of capturing virtual X-rays by using the lower limb 3D model. The center of the lower limb was defined as the midpoint of line FH–AC. The X-ray source was 1.6 and 1.8 m away from the center of the lower limb and the projection plane, respectively. The initial shooting direction was perpendicular to line FH–AC, passing through the center of the lower limb

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