Technical Brief

Stereotactic Radiosurgery Head Phantom Bite Tray Fit Reproducibility

[+] Author and Article Information
Michael S. Gossman

Chief Medical Physicist and RSO
Tri-State Regional Cancer Center,
Radiation Oncology Department,
706 23rd Street,
Ashland, KY 41101;
Regulation Directive Medical Physics®,
3312 Forestdale Court,
Flatwoods, KY 41139
e-mail: mgossman@tsrcc.com

Joshua R. Levy

The Phantom Laboratory,
P.O. Box 511,
Salem, NY 12865
e-mail: levy@phantomlab.com

1Corresponding author.

Manuscript received December 30, 2013; final manuscript received May 6, 2014; published online xx xx, xxxx. Assoc. Editor: Rafael V. Davalos.

J. Med. Devices 8(4), 044505 (Aug 19, 2014) (2 pages) Paper No: MED-13-1305; doi: 10.1115/1.4027677 History: Received December 30, 2013; Revised May 06, 2014

This research examines the accuracy of The Phantom Laboratory RSVP Phantom II with a jaw system that replicates patient biting. The research study examines the positional reproducibility as applicable for radiation oncology patients receiving stereotactic treatment. A bite tray was seated and locked into the phantom jaw system. Infrared passive fiducial array markers were attached to the bite tray. A head band containing a fiducial array was fit around the phantom skull. Ceiling mounted infrared cameras monitoring fiducial locations were used to calculate the spatial position of the bite tray relative to the stationary head band, as the bite tray was repeatedly removed, reinserted, and locked. For 100 sample mounts, the RSVP Phantom II jaw system proved to replicate the desired position with an average accuracy of 0.012 ± 0.001 mm and with a maximum difference of only 0.303 ± 0.001 mm. The innovation of the RSVP Phantom II jaw system is ideally suited for stereotactic radiosurgery and radiotherapy for commissioning and quality assurance.

Copyright © 2014 by ASME
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Grahic Jump Location
Fig. 1

Camera close-up view downward on the RSVP Phantom II with fiducial arrays mounted

Grahic Jump Location
Fig. 2

Phantom view upward visualizing the computer cart and ceiling-mounted camera array




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