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. 2016 Jun 14;8(6):e642. doi: 10.7759/cureus.642

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Copyright © 2016, Brown et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Side view of the N-localizer. The tomographic section intersects the N-localizer at two vertical rods and one diagonal rod. Tomographic image. The intersection of the tomographic section with the N-localizer produces two circles and one ellipse. The relative spacing between the centers of the ellipse and the two circles varies according to the height at which the tomographic section intersects the diagonal rod. Measuring this spacing permits calculation of the position of the tomographic section with respect to the N-localizer [2].

Inline graphic — Side view of the N-localizer. The tomographic section intersects the N-localizer at two vertical rods and one diagonal rod. Tomographic image. The intersection of the tomographic section with the N-localizer produces two circles and one ellipse. The relative spacing between the centers of the ellipse and the two circles varies according to the height at which the tomographic section intersects the diagonal rod. Measuring this spacing permits calculation of the position of the tomographic section with respect to the N-localizer [2].