English: Figure 3. Depiction of the Sturm-Pastyr localizer and its intersection with the tomographic image plane. (A) Side view of the Sturm-Pastyr localizer. The tomographic image plane intersects two diagonal rods and one vertical rod. (B) Tomographic image. The intersection of the tomographic image plane with the Sturm-Pastyr localizer creates two fiducial ellipses and one fiducial circle. The relative spacing between the circle and the two ellipses varies with the height at which the tomographic image plane intersects the vertical rod.
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