Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verification
Background: The use of electronic portal imaging devices (EPIDs) is a method for the dosimetric verification of radiotherapy plans, both pretreatment and in vivo. The aim of this study is to test a 2D EPID-based dosimetry algorithm for dose verification of some plans inside a homogenous and anthropo...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2016-01-01
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| Series: | Advanced Biomedical Research |
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| Online Access: | http://www.advbiores.net/article.asp?issn=2277-9175;year=2016;volume=5;issue=1;spage=171;epage=171;aulast=Jomehzadeh |
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| author | Ali Jomehzadeh Parvaneh Shokrani Mohammad Mohammadi Alireza Amouheidari |
| author_facet | Ali Jomehzadeh Parvaneh Shokrani Mohammad Mohammadi Alireza Amouheidari |
| author_sort | Ali Jomehzadeh |
| collection | DOAJ |
| description | Background: The use of electronic portal imaging devices (EPIDs) is a method for the dosimetric verification of radiotherapy plans, both pretreatment and in vivo. The aim of this study is to test a 2D EPID-based dosimetry algorithm for dose verification of some plans inside a homogenous and anthropomorphic phantom and in vivo as well.
Materials and Methods: Dose distributions were reconstructed from EPID images using a 2D EPID dosimetry algorithm inside a homogenous slab phantom for a simple 10 × 10 cm2 box technique, 3D conformal (prostate, head-and-neck, and lung), and intensity-modulated radiation therapy (IMRT) prostate plans inside an anthropomorphic (Alderson) phantom and in the patients (one fraction in vivo) for 3D conformal plans (prostate, head-and-neck and lung).
Results: The planned and EPID dose difference at the isocenter, on an average, was 1.7% for pretreatment verification and less than 3% for all in vivo plans, except for head-and-neck, which was 3.6%. The mean γ values for a seven-field prostate IMRT plan delivered to the Alderson phantom varied from 0.28 to 0.65. For 3D conformal plans applied for the Alderson phantom, all γ1% values were within the tolerance level for all plans and in both anteroposterior and posteroanterior (AP-PA) beams.
Conclusion: The 2D EPID-based dosimetry algorithm provides an accurate method to verify the dose of a simple 10 × 10 cm2 field, in two dimensions, inside a homogenous slab phantom and an IMRT prostate plan, as well as in 3D conformal plans (prostate, head-and-neck, and lung plans) applied using an anthropomorphic phantom and in vivo. However, further investigation to improve the 2D EPID dosimetry algorithm for a head-and-neck case, is necessary. |
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| id | doaj.art-a91f37a82b404b3cb5fbb67f2e1c6942 |
| institution | Directory Open Access Journal |
| issn | 2277-9175 |
| language | English |
| last_indexed | 2024-12-23T02:01:15Z |
| publishDate | 2016-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Advanced Biomedical Research |
| spelling | doaj.art-a91f37a82b404b3cb5fbb67f2e1c69422022-12-21T18:03:59ZengWolters Kluwer Medknow PublicationsAdvanced Biomedical Research2277-91752016-01-015117117110.4103/2277-9175.194799Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verificationAli JomehzadehParvaneh ShokraniMohammad MohammadiAlireza AmouheidariBackground: The use of electronic portal imaging devices (EPIDs) is a method for the dosimetric verification of radiotherapy plans, both pretreatment and in vivo. The aim of this study is to test a 2D EPID-based dosimetry algorithm for dose verification of some plans inside a homogenous and anthropomorphic phantom and in vivo as well. Materials and Methods: Dose distributions were reconstructed from EPID images using a 2D EPID dosimetry algorithm inside a homogenous slab phantom for a simple 10 × 10 cm2 box technique, 3D conformal (prostate, head-and-neck, and lung), and intensity-modulated radiation therapy (IMRT) prostate plans inside an anthropomorphic (Alderson) phantom and in the patients (one fraction in vivo) for 3D conformal plans (prostate, head-and-neck and lung). Results: The planned and EPID dose difference at the isocenter, on an average, was 1.7% for pretreatment verification and less than 3% for all in vivo plans, except for head-and-neck, which was 3.6%. The mean γ values for a seven-field prostate IMRT plan delivered to the Alderson phantom varied from 0.28 to 0.65. For 3D conformal plans applied for the Alderson phantom, all γ1% values were within the tolerance level for all plans and in both anteroposterior and posteroanterior (AP-PA) beams. Conclusion: The 2D EPID-based dosimetry algorithm provides an accurate method to verify the dose of a simple 10 × 10 cm2 field, in two dimensions, inside a homogenous slab phantom and an IMRT prostate plan, as well as in 3D conformal plans (prostate, head-and-neck, and lung plans) applied using an anthropomorphic phantom and in vivo. However, further investigation to improve the 2D EPID dosimetry algorithm for a head-and-neck case, is necessary.http://www.advbiores.net/article.asp?issn=2277-9175;year=2016;volume=5;issue=1;spage=171;epage=171;aulast=JomehzadehAlgorithmelectronic portal imaging devices dosimetryin vivo dosimetrymidplanepretreatment verification |
| spellingShingle | Ali Jomehzadeh Parvaneh Shokrani Mohammad Mohammadi Alireza Amouheidari Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verification Advanced Biomedical Research Algorithm electronic portal imaging devices dosimetry in vivo dosimetry midplane pretreatment verification |
| title | Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verification |
| title_full | Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verification |
| title_fullStr | Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verification |
| title_full_unstemmed | Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verification |
| title_short | Assessment of a 2D electronic portal imaging devices-based dosimetry algorithm for pretreatment and in-vivo midplane dose verification |
| title_sort | assessment of a 2d electronic portal imaging devices based dosimetry algorithm for pretreatment and in vivo midplane dose verification |
| topic | Algorithm electronic portal imaging devices dosimetry in vivo dosimetry midplane pretreatment verification |
| url | http://www.advbiores.net/article.asp?issn=2277-9175;year=2016;volume=5;issue=1;spage=171;epage=171;aulast=Jomehzadeh |
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