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. 2006 Feb 21;7(1):97–104. doi: 10.1120/jacmp.v7i1.2199

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© 2006 The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

OBI geometric phantom consists of five small radio‐opaque markers $(2.5 \times 1.0 {mm}^{2})$ embedded in lung‐equivalent material, and it is mounted on a Varian Exact™ Lok‐Bar with a cam‐lock locking mechanism incorporating a micrometer positioning tool for precisely moving the phantom in the couch lateral, longitudinal, and vertical directions.