Poster - Thurs Eve-09: Evaluation of a commercial 2D ion-chamber array for intensity modulated radiation therapy dose measurements

2008 ◽  
Vol 35 (7Part2) ◽  
pp. 3403-3403 ◽  
Author(s):  
X Mei ◽  
G Bracken ◽  
A Kerr
Keyword(s):  
Radiation Therapy ◽  
Intensity Modulated Radiation Therapy ◽  
Ion Chamber ◽  
Intensity Modulated ◽  
Dose Measurements

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.

Evaluation of thermoplastic Klarity mask use during intensity-modulated radiation therapy for head and neck carcinoma

2018 ◽  
Vol 17 (2) ◽  
pp. 171-178 ◽  
Author(s):  
Khaldoon Radaideh
Keyword(s):  
Radiation Therapy ◽  
Head And Neck ◽  
Intensity Modulated Radiation Therapy ◽  
Planning System ◽  
Skin Dose ◽  
Surface Dose ◽  
Thermoluminescent Dosimeters ◽  
Intensity Modulated ◽  
Skin Doses ◽  
Dose Measurements

AbstractAimTo evaluate the Klarity® Mask with respect to skin doses and toxicity secondary to head and neck cancer radiation treatment.Materials and methodsThis prospective study included five nasopharyngeal cancer patients who underwent intensity-modulated radiation therapy and monitored for skin toxicity. An anatomical Perspex head and neck phantom was designed and used. All patients’ treatment plans were separately transferred to the phantom. Dosimetric measurements were performed using chip-shaped thermoluminescent dosimeters (LiF:Mg,Ti TLDs) which were distributed at certain target points on the phantom. Phantom was irradiated twicely with and without a Klarity® Mask. Three fractions for each patient plan were obtained and compared with treatment planning system (TPS) doses as guided by computed tomography.ResultsThe Klarity mask used for patient immobilisation increased the surface dose by 10·83% more than that without the mask. The average variations between skin dose measurements with and without the Klarity mask for all patients’ plans ranged from 10·26 to 11·83%. TPS overestimated the surface dose by 19·13% when compared with thermoluminescent dosimeters that measured the direct skin dose.ConclusionsKlarity immobilisation mask increases skin doses, as a consequence, surface dose measurements should be monitored and must be taken into account.

Treatment Plan Verification of Intensity Modulated Radiation Therapy Fields Using 2-D Ion Chamber Array

2007 ◽  
Vol 23 (3-4) ◽  
pp. 129
Author(s):  
P.C. Ditsepu ◽  
S. Mabizela ◽  
A.J. van Rensburg ◽  
F. Daniels ◽  
E. Viviers
Keyword(s):  
Radiation Therapy ◽  
Treatment Plan ◽  
Intensity Modulated Radiation Therapy ◽  
Ion Chamber ◽  
Intensity Modulated
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