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. 2019 May 4;20(5):21–26. doi: 10.1002/acm2.12573

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© 2019 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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A computer‐aided design model of the constructed phantom is shown in (a). A picture of the phantom mounted on the treatment machine is shown in (b). (c) An exploded‐view drawing of the phantom consisting of (1) an acrylic plate, (2) optical breadboard, (3) a acrylic spacer, (4) thermoplastic sphere, (5) infrared marker, (6) translation stage, (7) flipper motor, and (8) SubMiniature version A to Bayonet Neill–Concelman adapters. (d) An example IFMM trace during a treatment showing the IFMM marker distance (blue points) on the Y axis as a function of time in seconds on the X axis. The five interruptions due to the phantom motion signaled by the user are shown in yellow.