skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The effect of metallic implants on radiation therapy in spinal tumor patients with metallic spinal implants

Abstract

The aim of this study was to evaluate the effect of metallic implants on the dose calculation for radiation therapy in patients with metallic implants and to find a way to reduce the error of dose calculation. We made a phantom in which titanium implants were inserted into positions similar to the implant positions in spinal posterior/posterolateral fusion. We compared the calculated dose of the treatment planning systems with the measured dose in the treatment equipment. We used 3 kinds of computed tomography (CT) (kilovoltage CT, extended-scaled kilovoltage CT, and megavoltage CT) and 3 kinds of treatment equipment (ARTISTE, TomoTherapy Hi-Art, and Cyberknife). For measurement of doses, we used an ionization chamber and Gafchromic external beam therapy film. The absolute doses that were measured using an ionization chamber at the isocenter in the titanium phantom were on average 1.9% lower than those in the reference phantom (p = 0.002). There was no statistically significant difference according to the kinds of CT images, the treatment equipment, and the size of the targets. As the distance from the surface of the titanium implants became closer, the measured doses tended to decrease (p < 0.001), and this showed a statistically significant difference amongmore » the kinds of CT images: the effect of metallic implants was less in the megavoltage CT than in the kilovoltage CT or the extended-scaled kilovoltage CT. The error caused by the titanium implants was beyond a clinically acceptable range. To reduce the error of dose calculation, we suggest that the megavoltage CT be used for planning. In addition, it is necessary to consider the distance between the titanium implants and the targets or the organs at risk to prescribe the dose for the target and the dose constraint for the organs at risk.« less

Authors:
;  [1];  [2]
  1. Department of Radiation Oncology, Seoul St. Mary's Hospital, the Catholic University of Korea, Seoul (Korea, Republic of)
  2. Department of Radiation Oncology, Uijeongbu St. Mary's Hospital, the Catholic University of Korea, Uijeongbu (Korea, Republic of)
Publication Date:
OSTI Identifier:
22130387
Resource Type:
Journal Article
Journal Name:
Medical Dosimetry
Additional Journal Information:
Journal Volume: 37; Journal Issue: 1; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0958-3947
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; CAT SCANNING; CT-GUIDED RADIOTHERAPY; DOSIMETRY; FILMS; HEALTH HAZARDS; IMPLANTS; IONIZATION CHAMBERS; NEOPLASMS; PATIENTS; PHANTOMS; PLANNING; RADIATION DOSES; TITANIUM

Citation Formats

Son, Seok Hyun, Kang, Young Nam, and Ryu, Mi-Ryeong. The effect of metallic implants on radiation therapy in spinal tumor patients with metallic spinal implants. United States: N. p., 2012. Web. doi:10.1016/J.MEDDOS.2011.01.007.
Son, Seok Hyun, Kang, Young Nam, & Ryu, Mi-Ryeong. The effect of metallic implants on radiation therapy in spinal tumor patients with metallic spinal implants. United States. https://doi.org/10.1016/J.MEDDOS.2011.01.007
Son, Seok Hyun, Kang, Young Nam, and Ryu, Mi-Ryeong. 2012. "The effect of metallic implants on radiation therapy in spinal tumor patients with metallic spinal implants". United States. https://doi.org/10.1016/J.MEDDOS.2011.01.007.
@article{osti_22130387,
title = {The effect of metallic implants on radiation therapy in spinal tumor patients with metallic spinal implants},
author = {Son, Seok Hyun and Kang, Young Nam and Ryu, Mi-Ryeong},
abstractNote = {The aim of this study was to evaluate the effect of metallic implants on the dose calculation for radiation therapy in patients with metallic implants and to find a way to reduce the error of dose calculation. We made a phantom in which titanium implants were inserted into positions similar to the implant positions in spinal posterior/posterolateral fusion. We compared the calculated dose of the treatment planning systems with the measured dose in the treatment equipment. We used 3 kinds of computed tomography (CT) (kilovoltage CT, extended-scaled kilovoltage CT, and megavoltage CT) and 3 kinds of treatment equipment (ARTISTE, TomoTherapy Hi-Art, and Cyberknife). For measurement of doses, we used an ionization chamber and Gafchromic external beam therapy film. The absolute doses that were measured using an ionization chamber at the isocenter in the titanium phantom were on average 1.9% lower than those in the reference phantom (p = 0.002). There was no statistically significant difference according to the kinds of CT images, the treatment equipment, and the size of the targets. As the distance from the surface of the titanium implants became closer, the measured doses tended to decrease (p < 0.001), and this showed a statistically significant difference among the kinds of CT images: the effect of metallic implants was less in the megavoltage CT than in the kilovoltage CT or the extended-scaled kilovoltage CT. The error caused by the titanium implants was beyond a clinically acceptable range. To reduce the error of dose calculation, we suggest that the megavoltage CT be used for planning. In addition, it is necessary to consider the distance between the titanium implants and the targets or the organs at risk to prescribe the dose for the target and the dose constraint for the organs at risk.},
doi = {10.1016/J.MEDDOS.2011.01.007},
url = {https://www.osti.gov/biblio/22130387}, journal = {Medical Dosimetry},
issn = {0958-3947},
number = 1,
volume = 37,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2012},
month = {Sun Apr 01 00:00:00 EDT 2012}
}