Isfahan University of Medical Sciences

Science Communicator Platform

Stay connected! Follow us on X network (Twitter):
Share this content! On (X network) By
Evaluation of Dosimetric Characteristics of Diodes and Ionization Chambers in Small Megavoltage Photon Field Dosimetry Publisher



Keivan H1, 2 ; Shahbazigahrouei D1 ; Shanei A1
Authors
Show Affiliations
Authors Affiliations
  1. 1. Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. School of Paramedicine, Shahroud University of Medical Sciences, Shahroud, Iran

Source: International Journal of Radiation Research Published:2018


Abstract

Background: Modern radiaon therapy such as intensity modulated radiaon therapy (IMRT) and volumetric modulated arc therapy (VMAT) has resulted in using small therapeuc photon beams. The scope of this work is to invesgate the variaon in efficiency of different ionizaon chambers and semiconductor diodes in small mul-leaf collimator (MLC) defined fields of ARTISTE linear accelerator. Materials and Methods: Dose distribuons measurements was done in field sizes ranging from 0.5×0.5 to 10×10 cm2 combining with Monte Carlo (MC) simulaon. The treatment head of linac and the detectors were simulated by means of BEAMnrc/DOSXYZnrc of EGSnrc MC. The parameters such as output rao (OR), penumbral width, dosimetric field size and the percentage surface dose in small radiaon fields was evaluated using ionizaon chambers and semiconductor dosimeters. Results: ORs and beam profiles resulng from various measurements showed significant difference between ionizaon chambers and diodes in small fields. Derivaon of less than 2% was observed between EDGE and Diode P. ORs vary by more than 30% for 1×1 cm2 field size but, in larger field sizes differences was less than 1%. Penumbra underesmaon was seen in Semiflex relave to pinpoint ionizaon chamber. No difference was seen in the pa?ern of surface dose among the applied detectors. Conclusion: Dosimetric characteriscs of different detectors showed significant differences in small photon beams. Profiles and ORs analysis with different dosimeters showed that not only water equivalency of detectors, but also dosimeter acve volume is important factors for determinaon of dosimetric behavior in small photon beams. © 2018 Novin Medical Radiation Institute.All right reserved.
Related Docs
View other Related Docs
1. Assessment of Imprecise Small Photon Beam Modeling by Two Treatment Planning System Algorithms, Journal of Medical Signals and Sensors (2018)
2. Evaluation of Effective Field Size Characteristics for Small Megavoltage Photon Beam Dosimetry, International Journal of Radiation Research (2022)
3. Monte Carlo Simulation of Siemens Oncor Linear Accelerator With Beamnrc and Dosxyznrc Code, Journal of Medical Signals and Sensors (2013)
4. A Novel Gpu-Based Fast Monte Carlo Photon Dose Calculating Method for Accurate Radiotherapy Treatment Planning, Journal of Biomedical Physics and Engineering (2020)
5. Development and Implementation of a Monte Carlo Frame Work for Evaluation of Patient Specific Out- of - Field Organ Equivalent Dose, International Journal of Radiation Research (2017)
6. Photoneutron Shielding Design for an 18 Mv Saturne 20 Medical Linear Accelerator, Journal of Isfahan Medical School (2014)
7. Monte Carlo Study and Design of System for Implementation of Rotational Total Skin Electron Irradiation Technique, Journal of Instrumentation (2018)
8. Photoneutron Contamination From an 18 Mv Saturne Medical Linear Accelerator in the Treatment Room, Radiation Protection Dosimetry (2013)
Experts (# of related papers)
View all Related Experts
Daryoush Shahbazi-Gahrouei (13)
Mohammad Bagher Tavakoli (11)
Other Related Docs
9. The Effect of Field Modifier Blocks on the Fast Photoneutron Dose Equivalent From Two High-Energy Medical Linear Accelerators, Radiation Protection Dosimetry (2008)
10. Measurement of Photoneutron Dose in the Linear Accelerator at the Radiation Therapy Section of Seyed-Al-Shohada Hospital, Isfahan, Iran, Journal of Isfahan Medical School (2012)
11. Evaluating the Effect of the Vacuum Bag on the Dose Distribution in Radiation Therapy, Journal of Cancer Research and Therapeutics (2018)
12. The Quality Control of Intensity Modulated Radiation Therapy (Imrt) for Oncor Siemens Linear Accelerators Using Film Dosimetry, Iranian Journal of Medical Physics (2012)
13. A Study of the Photoneutron Dose Equivalent Resulting From a Saturne 20 Medical Linac Using Monte Carlo Method, Nukleonika (2007)
14. Measurement of Photoneutron Dose Produced by Wedge Filters of a High Energy Linac Using Polycarbonate Films, Journal of Radiation Research (2008)
15. A Comparison of the Basic Photon and Electron Dosimetry Data for Neptun 10Pc Linear Accelerators, Nukleonika (2008)
16. Monte Carlo Evaluation of the Potential Benefits of Flattening Filter Free Beams From the Oncor ® Clinical Linear Accelerator, Journal of X-Ray Science and Technology (2018)
17. Sensitivity Analysis of a 6 Mev Photon Beam Monte Carlo Model, Journal of Medical Signals and Sensors (2023)
18. The Influence of Brass Compensator Thickness and Field Size on Neutron Contamination Spectrum in 18Mv Elekta Sl 75/25 Medical Linear Accelerator With and Without Flattening Filter: A Monte Carlo Study, Journal of Biomedical Physics and Engineering (2018)
19. Dose Distribution Analysis for Electron Beam Irregular Fields in Treatment of Superficial Tumors: A Monte Carlo Study, Journal of Isfahan Medical School (2011)
20. Out-Of-Field Beam Characteristics of a 6Mv Photon Beam: Results of a Monte Carlo Study, Applied Radiation and Isotopes (2013)
21. Investigation and Comparison of Coplanar Versus Noncoplanar Intensity-Modulated Radiation Therapy (Imrt) Techniques in Glioblastoma Multiforme Tumors, Journal of Isfahan Medical School (2018)
22. Feasibility of 18-Mv Grid Therapy From Radiation Protection Aspects: Unwanted Dose and Fatal Cancer Risk Caused by Photoneutrons and Scattered Photons, Computer Methods and Programs in Biomedicine (2022)
23. Effect of Material and Wall Thickness Buildup Caps on the Head Scatter Factor Measurements in Irregular Fields Shielded by Cerrobend, Journal of Medical Signals and Sensors (2017)
24. Assessment of Skyshine Photon Dose Rates From 9 and 18 Mv Medical Linear Accelerators, International Journal of Radiation Research (2018)
25. First Macro Monte Carlo Based Commercial Dose Calculation Module for Electron Beam Treatment Planning - New Issues for Clinical Consideration, Physics in Medicine and Biology (2006)
26. An Intraoral Cone System for a Neptun 10Pc Linear Accelerator, Nukleonika (2011)
27. Dosimetric Verification of Lung Phantom Calculated by Collapsed Cone Convolution: A Monte Carlo and Experimental Evaluation, Journal of X-Ray Science and Technology (2019)
28. Estimating Radiotherapy-Induced Secondary Cancer Risk Arising From Brain Irradiation at High Energy: A Monte Carlo Study, Frontiers in Biomedical Technologies (2022)
29. Measurement of Imposed Radiation Dose and Normal Tissue Complications Probability to Lung and Heart in Patients With Mastectomy Using Two Common Tangential Radiotherapy Methods of Supraclavicular Nodes, Anterior-Posterior (Ap) and Two Parallel Opposed Fields (Pofs), Journal of Isfahan Medical School (2018)
30. Impact of Serum Uric Acid on the Aggravation of Renal Function; Current Knowledge and New Concepts, Life Science Journal (2014)
31. Evaluation of the Photon Dose Calculation Accuracy in Radiation Therapy of Malignant Pleural Mesothelioma, Journal of Cancer Research and Therapeutics (2018)
32. Comparison of Electromagnetic and Hadronic Models Generated Using Geant 4 With Antiproton Dose Measured in Cern, Journal of Medical Physics (2015)
33. Monte Carlo Modeling of Skyshine Dose Distribution in Vicinity of Medical Accelerator Facilities, Journal of Isfahan Medical School (2017)
34. Calculation of Excess Dose to the Eye Phantom Due to a Distanced Shielding for Electron Therapy in Head and Neck Cancers, Journal of Medical Signals and Sensors (2012)
35. Monte Carlo Study of Fetal Dosimetry Parameters for 6 Mv Photon Beam, Journal of Medical Signals and Sensors (2013)
36. The Role of the Spatially Fractionated Radiation Therapy in the Management of Advanced Bulky Tumors, Polish Journal of Medical Physics and Engineering (2021)
37. Cisplatin-Induced Renal Toxicity: A Short Review, Life Science Journal (2014)
38. Characterization and Monte Carlo Simulation of Low- and High-Perturbation In-Vivo Diode Dosimeters for 9 Mv X-Rays, IFMBE Proceedings (2009)
39. Effective Point of Measurement in Cylindrical Ion Chamber for Megavoltage Photon Beams, Iranian Journal of Medical Physics (2013)
40. Comparison and Evaluation of Different Treatment Plans With Ifrt Field and 6 and 18 Mv Energies in Hodgkin’S Lymphoma Involvement Neck and Mediastinum, Journal of Biomedical Physics and Engineering (2018)
41. A Monte Carlo and Experimental Investigation of the Dosimetric Behavior of Low- and Medium-Perturbation Diodes Used for Entrance in Vivo Dosimetry in Megavoltage Photon Beams, Journal of Applied Clinical Medical Physics (2012)
42. An Inter-Comparison Between Accuracy of Egsnrc and Mcnpx Monte Carlo Codes in Dosimetric Characterization of Intraoperative Electron Beam, Computers in Biology and Medicine (2021)
43. Measurement of Ipsilateral Lung and Heart Dose in Radiotherapy of Left Sided Mastectomy Patients in Common Different Clinical Techniques: A Phantom Study, International Journal of Radiation Research (2018)
44. Dosimetric Characteristics of 137Cs Sources Used in After Loading Selectron System by Monte Carlo Method, Iranian Journal of Radiation Research (2007)
45. Semi-Experimental Assessment of Neutron Equivalent Dose and Secondary Cancer Risk for Off-Field Organs in Glioma Patients Undergoing 18-Mv Radiotherapy, PLoS ONE (2022)
46. Evaluation of Calculation Errors of Treatment Planning System in Dose Distribution of Electron Beams Inside the Lung in Three-Dimensional Conformal Radiation Therapy (3D-Crt), Journal of Isfahan Medical School (2017)
47. An Approach in Radiation Therapy Treatment Planning: A Fast, Gpu-Based Monte Carlo Method, Journal of Medical Signals and Sensors (2017)
48. Evaluation of Targeted Image-Guided Radiation Therapy Treatment Planning System by Use of American Association of Physicists in Medicine Task Group-119 Test Cases, Journal of Medical Signals and Sensors (2018)
49. Investigating the Out-Of-Field Doses and Estimating the Risk of Secondary Thyroid Cancer in High-Grade Gliomas Radiation Therapy With Modulated Intensity and 3D-Conformal: A Phantom Study, International Journal of Radiation Research (2021)