High-energy electron and photon therapy to the parotid bed: Radiation dose perturbations with a titanium mandibular implant
| Autor: | J. Bews, Roman I Skoracki, Cynthia M Menard, Amit Chowdhury |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Titanium
Photons Dosimeter Phantoms Imaging business.industry medicine.medical_treatment Radiography chemistry.chemical_element Electrons Radiotherapy Dosage Mandible Prostheses and Implants Radiation Radiotherapy High-Energy Radiation therapy chemistry medicine Parotid Gland Radiology Nuclear Medicine and imaging Implant Irradiation business Nuclear medicine Beam (structure) |
| Zdroj: | Australasian Radiology. 43:495-499 |
| ISSN: | 1440-1673 0004-8461 |
| DOI: | 10.1046/j.1440-1673.1999.00713.x |
| Popis: | Adjuvant radiation therapy to the parotid bed is commonly administered following surgical resection using either a pair of angled wedged photon beams or an ipsilateral mixed-beam portal of electrons and photons. The present study seeks to determine the optimal parotid bed treatment technique in the presence of a titanium mandibular implant by investigating perturbations in the dose distribution deep to this implant for a 15-MeV electron beam and a 6-MV photon beam. A titanium mandibular plate was embedded in a tissue-equivalent phantom, and irradiated with 15-MeV electrons, and 6 MV photons. Radiation doses behind the plate were measured with both thermoluminescent dosimeters and radiographic film. With 15-MeV electrons, there is a clinically significant decrease in the dose beyond the titanium plate, which is most important at 5-mm and 10-mm depths (18-27%). With 6-MV photons the dose at the deep interface of titanium and tissue is reduced by between 15 and 18%, but rapidly drops to < 5% at a depth of 5 mm. In adjuvant treatment to the parotid bed, when the clinical target volume includes tissue positioned deep to a titanium implant, significant underdosage occurs with ipsilateral beam arrangements, especially when electrons are used. |
| Databáze: | OpenAIRE |
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