Fig. 1. X-ray image system.
Fig. 2. Right arm phantom.
Fig. 3. Profile for forearm at point of x = 100 pixels.
Fig. 4. Profile for upper arm at point of y = 1450 pixels.
Fig. 5. Four indicators for checking arm angle.
Fig. 6. Determination of arm angle using two straight lines.
Fig. 7. Flow chart for right positioning.
Fig. 8. Image of angle < 90°.
Fig. 9. Image of angle > 90°.
Fig. 10. Image of angle ≅ 90°.
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