SU-E-T-537: A Dosimetric Study of Gafchromic EBT2 Film for Small Field Size Stereotactic Radiosurgery QA

2011 ◽  
Vol 38 (6Part19) ◽  
pp. 3612-3612
Author(s):  
X Zhang ◽  
Y Yan ◽  
S Sharma ◽  
P Corry ◽  
V Ratanatharathorn ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Field Size ◽  
Small Field ◽  
Dosimetric Study ◽  
Gafchromic Ebt2 Film ◽  
Ebt2 Film

Energy dependence and dose response of Gafchromic EBT2 film over a wide range of photon, electron, and proton beam energies

2010 ◽  
Vol 37 (5) ◽  
pp. 1942-1947 ◽  
Author(s):  
Bijan Arjomandy ◽  
Ramesh Tailor ◽  
Aman Anand ◽  
Narayan Sahoo ◽  
Michael Gillin ◽  
...  
Keyword(s):  
Proton Beam ◽  
Energy Dependence ◽  
Dose Response ◽  
Wide Range ◽  
Gafchromic Ebt2 Film ◽  
Ebt2 Film

Monte Carlo study on mucosal dose in oral and naval cavity using photon beams with small field

2011 ◽  
Vol 10 (4) ◽  
pp. 261-271 ◽  
Author(s):  
James C.L. Chow ◽  
Amir M. Owrangi
Keyword(s):  
Monte Carlo ◽  
Beam Energy ◽  
Field Size ◽  
Small Field ◽  
Beam Angle ◽  
Photon Beams ◽  
Dose Ratio ◽  
Dose Enhancement ◽  
Bone Interface ◽  
Energy Beam

AbstractWe study how mucosal dose in the oral or nasal cavity depends on the irradiated small segmental photon fields varying with beam energy, beam angle and mucosa thickness. Dose ratio (mucosal dose with bone underneath to dose at the same point without bone) reflecting the dose enhancement due to the bone backscatter was determined by Monte Carlo simulation (EGSnrc-based code), validated by measurements. Phase space files based on the 6 and 18 MV photon beams with small field size of 1 × 1 cm2, produced by a Varian 21 EX linear accelerator, were generated using the BEAMnrc Monte Carlo code. Mucosa phantoms (mucosa thickness = 1, 2 and 3 mm) with and without a bone under the mucosa were irradiated by photon beams with gantry angles varying from 0 to 30°. Doses along the central beam axis in the mucosa and the dose ratio were calculated with different mucosa thicknesses. For the 6 MV photon beams, the dose at the mucosa-bone interface increased by 44.9–41.7%, when the mucosa thickness increased from 1 to 3 mm for the beam angle ranging from 0 to 30°. These values were lower than those (58.8–53.6%) for the 18 MV photon beams with the same beam angle range. For both the 6 and 18 MV photon beams, depth doses in the mucosa were found to increase with an increase of the beam angle. Moreover, the dose gradient in the mucosa was greater for the 18 MV photon beams compared to the 6 MV. For the dose ratio, it was found that the dose enhancement due to the bone backscatter increased with a decrease of mucosa thickness, and was more significant at both the air-mucosa and mucosa-bone interface. Mucosal dose with bone was investigated by Monte Carlo simulations with different experimental configurations, and was found vary with the beam energy, beam angle and mucosa thickness for a small segmental photon field. The dosimetric information in this study should be considered when searching for an optimized treatment strategy to minimize the mucosal complications in the head-and-neck intensity-modulated radiation therapy.

Characterization of small-field stereotactic radiosurgery beams with modern detectors

2013 ◽  
Vol 58 (21) ◽  
pp. 7595-7608 ◽  
Author(s):  
Madelaine Tyler ◽  
Paul Z Y Liu ◽  
Kin Wa Chan ◽  
Anna Ralston ◽  
David R McKenzie ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Small Field

SU-E-T-120: Minimum Absorbed Dose Limit for Gafchromic EBT2 Film Response after Exposure to Low-Energy Photons

2012 ◽  
Vol 39 (6Part11) ◽  
pp. 3730-3730
Author(s):  
G Massillon-JL ◽  
I Domingo-Muñoz ◽  
P Díaz-Aguirre
Keyword(s):  
Absorbed Dose ◽  
Low Energy ◽  
Dose Limit ◽  
Gafchromic Ebt2 Film ◽  
Ebt2 Film

High dose per fraction dosimetry of small fields with Gafchromic EBT2 film

2011 ◽  
Vol 38 (7) ◽  
pp. 4081-4085 ◽  
Author(s):  
Nicholas Hardcastle ◽  
Amar Basavatia ◽  
Adam Bayliss ◽  
Wolfgang A. Tomé
Keyword(s):  
High Dose ◽  
Small Fields ◽  
Gafchromic Ebt2 Film ◽  
Ebt2 Film ◽  
Dose Per Fraction
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