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Radiation Protection Dosimetry 2005 115(1-4):508-512; doi:10.1093/rpd/nci041
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Measurements of secondary neutron dose from 15 MV and 18 MV IMRT

Rebecca M. Howell1,3,*, Michele S. Ferenci1,4, Nolan E. Hertel2, Gary D. Fullerton3, Timothy Fox1 and Lawrence W. Davis1

1 Department of Radiation Oncology, Emory University, 1365 Clifton Road, NE, Atlanta, GA 30322, USA
2 Georgia Institute of Technology, Neely Nuclear Research Center, 900 Atlantic Drive, Atlanta, GA 30332-0425, USA
3 Department of Radiological Sciences, University of Texas Health Science Center, 7703 Floyd Curl, San Antonio, TX 7822, USA
4 Present address: UPMC Cancer Centers, Robert E. Eberly Pavilion, 410 McClelland Town Road, Uniontown, PA 15401, USA

* Corresponding author: Rebecca{at}radonc.emory.org

Secondary neutron dose-equivalents were determined for conventional and intensity modulated radiation therapy (IMRT) prostate treatments for 15 and 18 MV X-ray beams. Conventional and IMRT treatment plans were generated to deliver 45 Gy to the prostate, seminal vessicles and external and internal iliac lymph nodes. Neutron spectra were determined by unfolding measurements from a TLD-based Bonner sphere system. Treatments using 18 MV IMRT and conventional plans result in neutron ambient dose-equivalents of 687 and 112 mSv, respectively. Delivery of the 15 MV IMRT and conventional plans results in neutron ambient dose-equivalents of 327 and 52 mSv, respectively. The data illustrate that using lower photon energies for IMRT reduces the secondary neutron dose, while still achieving comparable treatment volume coverage and sparing critical normal tissue.


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