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. Author manuscript; available in PMC: 2016 Apr 25.
Published in final edited form as: J Orthop Res. 2013 Jul 17;31(12):1881–1889. doi: 10.1002/jor.22437

Figure 1.

Figure 1

The biplane radiography system and bone-model-based tracking technique. (A) The biplane radiography system was configured with an angle of approximately 55° between X-ray tube/image intensifier pairs. Each cardiac cine-angiography generator produced short duration (2.5 ms), high powered (70 kVp, 160 mA), X-ray pulses at a rate of 30 pulses per second. (B) The virtual X-ray system for model based tracking. A 3D CT reconstruction of the bone was placed in a computer-generated reproduction of the X-ray system. Simulated X-rays were then passed through the 3D CT reconstruction to generate digitally reconstructed radiographs (DRRs). Bone position and orientation was determined by a computer algorithm that optimized the correlation between the DRRs (green in image) and the edge-enhanced radiographs (red in figure).