SU-E-T-426: Assessment of the Limitations of Intensity Modulated Radiation Therapy Quality Control Procedure

2011 ◽  
Vol 38 (6Part17) ◽  
pp. 3586-3586
Author(s):  
F Girard ◽  
F Lacroix
Keyword(s):  
Quality Control ◽  
Radiation Therapy ◽  
Intensity Modulated Radiation Therapy ◽  
Control Procedure ◽  
Intensity Modulated ◽  
Quality Control Procedure ◽  
Therapy Quality

Dosimetric verification and quality assurance for intensity-modulated radiation therapy using Gafchromic® EBT3 film

2017 ◽  
Vol 17 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Khalid Iqbal ◽  
Muhammad Mazhar Iqbal ◽  
Muhammad Akram ◽  
Saima Altaf ◽  
Saeed Ahmad Buzdar
Keyword(s):  
Quality Assurance ◽  
Radiation Therapy ◽  
Intensity Modulated Radiation Therapy ◽  
Imrt Qa ◽  
Ion Chamber ◽  
Intensity Modulated ◽  
Dosimetric Verification ◽  
Therapy Quality ◽  
Dosimetric Assessment ◽  
Radiation Therapy Quality Assurance

AbstractPurposeThis study aimed to examine the dosimetric properties of Gafchromic® EBT3 film and intensity-modulated radiation therapy quality assurance (IMRT QA).Materials and methodsBeams characteristics dosimetric properties and 20 IMRT plans were created and irradiated on Varian dual-energy DHX-S Linac for 6 and 15 MV energies. EBT3 films were analysed using ‘film Pro QA 2014’ software.ResultsThe dosimetric comparison of EBT3 film (for red channel dosimetry) and ionisation ion chamber measurement showed that average deviations of symmetry, flatness, central axis, penumbra (left) and penumbra (right) of dose profile were 0·18, 1·34, 0·49%, 3·68 and 3·61 mm for 6 MV and 0·10, 1·3, 0·45, 2·65 and 2·71 mm for 15 MV, respectively. The blue and green channels dosimetry showed greater dose deviation as compared with red channel. IMRT QA verification plan complied about 95% at all different criteria. Reproducibility, stability and face orientation of film were within 1·4% for red channel.ConclusionsThe results advocate that the film can be used not only for dosimetric assessment but also as a reliable IMRT QA tool.

scholarly journals Optimization of Clarkson’s Method for Calculating Absorbed Dose under Compensator Filters used in Intensity-modulated Radiation Therapy

2018 ◽  
Author(s):  
M Pourkaveh ◽  
A Haghparast ◽  
M T Eivazi ◽  
K Ghazikhanlu sani
Keyword(s):  
Quality Control ◽  
Radiation Therapy ◽  
Energy Levels ◽  
Intensity Modulated Radiation Therapy ◽  
Absorbed Dose ◽  
Dose Calculation ◽  
Background Intensity ◽  
Intensity Modulated ◽  
Different Dimensions ◽  
Good Agreement

Background: Intensity Modulated Radiation Therapy (IMRT) is extensively used in the treatment of malignancies. Clarkson's method is one of the leading methods for dose calculation at open points present in irregular fields.Objective: The aim of this study is to generalize the Clarkson's method for dose calculation at points under compensator filters in IMRT method and its application in IMRT quality control as well.Methods: In this study, compensator filters were designed in two forms: flat filter and block piled-up compensator. The measurements for the compensator filters and open fields in 5 and10 cm depths at energy levels ( 6, 10 and 18 MV) and in fields with different dimensions were performed using "Mapcheck2" dosimeter. The aim of performing calculations is to derive the theoretical dose by the generalized Clarkson's equation and comparing it with data resulted from the measurement for confirming the Clarkson's equation presented.Results: These results demonstrate the data derived from the generalized Clarkson's method are in good agreement with the data resulted from measurement; the highest error of the proposed equation was 3% for flat filter, and less than 5% for block-piled-up filter. Higher error in the block-piled-up filter compared with the flat filter was due to the presence of leakage between these blocks.Conclusion: The results of this study demonstrated that the presented equation is reliable and valid, and the proposed equation can be applied for dose calculation at all points under the compensator filter or the shielded areas.

Sign in / Sign up

Export Citation Format

Share Document