PMID: 10348305May 29, 1999Paper

Effect of metal reconstruction plates on cobalt-60 dose distribution: a predictive formula and clinical implications

International Journal of Radiation Oncology, Biology, Physics
E MelianG P Glasgow

Abstract

We sought to create a predictive formula for the dose perturbations caused by head and neck reconstruction plates in the delivery of postoperative radiotherapy with 60Co beams. The dose perturbation effects of Vitallium and Titanium reconstruction plates and flat metal plates of aluminum (13Al), stainless steel (26Fe), tin (50Sn) and lead (82Pb) irradiated with a 60Co beam were measured in polystyrene phantoms using a film dosimetry system. We then used these results to create formulas to predict the effect of a metal reconstruction plate dependent upon its effective atomic number. Percentage dose increases secondary to back scattering were 10% at 1 mm in front of the Vitallium plate and 40% at the plate while the percentage dose decrease was 29% at the plate and 10% 1 mm behind the plate. For the Titanium plate, the percentage dose increase was 5% at 1 mm in front the plate and 25% at the plate while the percentage dose decrease was 20% at the plate and 5% 1 mm behind the plate. For flat plates the percentage dose increases and decreases, respectively, at the plate surfaces were: 13Al (8%, 6%), 26Fe (35%, 16%), 50Sn (60%, 24%), and 82Pb (85%, 13%). A second order polynomial predicting the back scatter and shadowing effects was...Continue Reading

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Citations

Jul 29, 2003·American Journal of Otolaryngology·Francisco V de Mello-FilhoCatherine E Miles
Feb 14, 2009·Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [et Al.]·Manuel Angel Rodriguez-PrietoPedro Sánchez-Sambucety
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Apr 10, 2002·The Journal of Prosthetic Dentistry·Bernd ReitemeierThomas Herrmann
Sep 8, 2012·Journal of Applied Clinical Medical Physics·Joseph T RakowskiSandeep Mittal

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