Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation
Introduction: Penumbra is an important property of the radiation beam to obtain a suitable margin surrounding the target volume. Therefore, the precise penumbra width determination in stereotactic radiotherapy is necessary for treatment planning. This study aimed to compare the obtained results of p...
Main Authors: | , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Mashhad University of Medical Sciences
2019-05-01
|
Series: | Iranian Journal of Medical Physics |
Subjects: | |
Online Access: | http://ijmp.mums.ac.ir/article_11751_12b5f76131828b26ac5603eb0dae519d.pdf |
id |
doaj-e7f2426b64a1404ba2c4b4eedecdeddd |
---|---|
record_format |
Article |
spelling |
doaj-e7f2426b64a1404ba2c4b4eedecdeddd2020-11-25T00:55:11ZengMashhad University of Medical SciencesIranian Journal of Medical Physics2345-36722345-36722019-05-0116323224010.22038/ijmp.2018.32356.138711751Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo SimulationSareh Tajiki0hassan nedaie1Mahbod Esfehani2Ghazale Geraily3mohsen hassani4Ali Rastjoo Ardakani5Ehsan Mohammadi6mansur naderi7Radiotherapy Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences,Tehran, Iran.radiotherapy oncology department, cancer research centre, Tehran university of medical sciences,Tehran,IranRadiotherapeutic Oncology Department of Cancer Institute, Tehran, IranDepartment of Medical Physics, Tehran University of Medical Science, Tehran, IranDepartment of Radiotherapy Physics, Cancer Research Centre, cancer Institute, Tehran University of Medical Sciences, Tehran, IranTehran University of Medical SciencesRadiotherapy Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, IranRadiotherapy Oncology Department, Cancer Research Centre, Tehran University of Medical Sciences, Tehran, IranIntroduction: Penumbra is an important property of the radiation beam to obtain a suitable margin surrounding the target volume. Therefore, the precise penumbra width determination in stereotactic radiotherapy is necessary for treatment planning. This study aimed to compare the obtained results of penumbra width by in-house and standard circular cones by different dosimeters, as well as evaluating the function of EBT3 for dosimetric properties of the small field radiation. Material and Methods: Different circular cones were mounted on the head of the accelerator to produce 12, 20, and 40 mm field sizes at isocenter. Dosimetric measurements were performed with the EBT3 film, PinPoint ion chamber. Afterwards, MCNPX Monte Carlo simulation was used to evaluate the dosimetric parameters. Results: According to the obtained results, the penumbra width was increased by larger diameters of circular cones. The obtained measured data by PinPoint ion chamber showed a larger penumbra width compared to those calculated by Monte Carlo at all field sizes. The gamma index analysis revealed distance-to-agreement and dose-difference of 2 mm /2%/ at all points. The results of this study showed that source to diaphragm distance had a major role in penumbra size determination of small field dosimetry with PinPoint ion chamber, EBT3 film, and Monte Carlo simulation. Conclusion: As findings of this study reported, EBT3 films are reliable detectors for relative dosimetry due to high spatial resolution for small field sizes. Furthermore, they can be used for measuring beam profile and percentage depth dose curves.http://ijmp.mums.ac.ir/article_11751_12b5f76131828b26ac5603eb0dae519d.pdfMonte Carlo Methodsmall fieldpenumbraGafchromic Film Stereotactic Radiotherapy |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sareh Tajiki hassan nedaie Mahbod Esfehani Ghazale Geraily mohsen hassani Ali Rastjoo Ardakani Ehsan Mohammadi mansur naderi |
spellingShingle |
Sareh Tajiki hassan nedaie Mahbod Esfehani Ghazale Geraily mohsen hassani Ali Rastjoo Ardakani Ehsan Mohammadi mansur naderi Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation Iranian Journal of Medical Physics Monte Carlo Method small field penumbra Gafchromic Film Stereotactic Radiotherapy |
author_facet |
Sareh Tajiki hassan nedaie Mahbod Esfehani Ghazale Geraily mohsen hassani Ali Rastjoo Ardakani Ehsan Mohammadi mansur naderi |
author_sort |
Sareh Tajiki |
title |
Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation |
title_short |
Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation |
title_full |
Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation |
title_fullStr |
Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation |
title_full_unstemmed |
Penumbra Measurements and Comparison of In-House and Standard Circular Cones by the Gafchoromic Film, Pinpoint Ion Chamber, and MCNPX Monte Carlo Simulation |
title_sort |
penumbra measurements and comparison of in-house and standard circular cones by the gafchoromic film, pinpoint ion chamber, and mcnpx monte carlo simulation |
publisher |
Mashhad University of Medical Sciences |
series |
Iranian Journal of Medical Physics |
issn |
2345-3672 2345-3672 |
publishDate |
2019-05-01 |
description |
Introduction: Penumbra is an important property of the radiation beam to obtain a suitable margin surrounding the target volume. Therefore, the precise penumbra width determination in stereotactic radiotherapy is necessary for treatment planning. This study aimed to compare the obtained results of penumbra width by in-house and standard circular cones by different dosimeters, as well as evaluating the function of EBT3 for dosimetric properties of the small field radiation.
Material and Methods: Different circular cones were mounted on the head of the accelerator to produce 12, 20, and 40 mm field sizes at isocenter. Dosimetric measurements were performed with the EBT3 film, PinPoint ion chamber. Afterwards, MCNPX Monte Carlo simulation was used to evaluate the dosimetric parameters.
Results: According to the obtained results, the penumbra width was increased by larger diameters of circular cones. The obtained measured data by PinPoint ion chamber showed a larger penumbra width compared to those calculated by Monte Carlo at all field sizes. The gamma index analysis revealed distance-to-agreement and dose-difference of 2 mm /2%/ at all points. The results of this study showed that source to diaphragm distance had a major role in penumbra size determination of small field dosimetry with PinPoint ion chamber, EBT3 film, and Monte Carlo simulation.
Conclusion: As findings of this study reported, EBT3 films are reliable detectors for relative dosimetry due to high spatial resolution for small field sizes. Furthermore, they can be used for measuring beam profile and percentage depth dose curves. |
topic |
Monte Carlo Method small field penumbra Gafchromic Film Stereotactic Radiotherapy |
url |
http://ijmp.mums.ac.ir/article_11751_12b5f76131828b26ac5603eb0dae519d.pdf |
work_keys_str_mv |
AT sarehtajiki penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation AT hassannedaie penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation AT mahbodesfehani penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation AT ghazalegeraily penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation AT mohsenhassani penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation AT alirastjooardakani penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation AT ehsanmohammadi penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation AT mansurnaderi penumbrameasurementsandcomparisonofinhouseandstandardcircularconesbythegafchoromicfilmpinpointionchamberandmcnpxmontecarlosimulation |
_version_ |
1725231540256899072 |