Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters
Background: Virtual wedge (VW) is used in radiotherapy to compensate for missing tissues and create a uniform dose distribution in tissues. According to TECDOC-1583 and technical reports series no. 430, evaluating the dose calculation accuracy is essential for the quality assurance of treatment plan...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2023-01-01
|
| Series: | Journal of Medical Signals and Sensors |
| Subjects: | |
| Online Access: | http://www.jmssjournal.net/article.asp?issn=2228-7477;year=2023;volume=13;issue=3;spage=191;epage=198;aulast=Zeinali |
| _version_ | 1797738522855079936 |
|---|---|
| author | Ahad Zeinali Mikaeil Molazadeh Samaneh Ganjgahi Hassan Saberi |
| author_facet | Ahad Zeinali Mikaeil Molazadeh Samaneh Ganjgahi Hassan Saberi |
| author_sort | Ahad Zeinali |
| collection | DOAJ |
| description | Background: Virtual wedge (VW) is used in radiotherapy to compensate for missing tissues and create a uniform dose distribution in tissues. According to TECDOC-1583 and technical reports series no. 430, evaluating the dose calculation accuracy is essential for the quality assurance of treatment planning systems (TPSs). In this study, the dose calculation accuracy of the collapsed cone superposition (CCS) algorithm in the postmastectomy radiotherapy of the chest wall for breast cancer was evaluated by comparing the calculated and measured dose in VW fields. Methods: Two tangential fields with the typical VW angles were planned using ISOgray TPS in a thorax phantom. The CCS algorithm was used for dose calculation at 6 and 15 MV photon beams. The obtained dose distributions from EBT3 film spaces and TPS were evaluated using the gamma index. Results: The measured and calculated dose values using VW in a heterogeneous medium with different beam energies were in a good agreement with each other (acceptance rate: 88.0%–93.4%). The calculated and measured data did not differ significantly with an increase/decrease in wedge angle. In addition, the results demonstrated that ISOgray overestimated and underestimated the dose of the soft tissue and lung in the planned volume, respectively. Conclusions: According to the results of gamma index analysis, the calculated dose distribution using VW model with the CCS algorithm in a heterogeneous environment was within acceptable limits. |
| first_indexed | 2024-03-12T13:44:59Z |
| format | Article |
| id | doaj.art-55d0d5497a8540549794c5820a4d0037 |
| institution | Directory Open Access Journal |
| issn | 2228-7477 |
| language | English |
| last_indexed | 2024-03-12T13:44:59Z |
| publishDate | 2023-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Signals and Sensors |
| spelling | doaj.art-55d0d5497a8540549794c5820a4d00372023-08-23T09:42:50ZengWolters Kluwer Medknow PublicationsJournal of Medical Signals and Sensors2228-74772023-01-0113319119810.4103/jmss.jmss_7_22Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filtersAhad ZeinaliMikaeil MolazadehSamaneh GanjgahiHassan SaberiBackground: Virtual wedge (VW) is used in radiotherapy to compensate for missing tissues and create a uniform dose distribution in tissues. According to TECDOC-1583 and technical reports series no. 430, evaluating the dose calculation accuracy is essential for the quality assurance of treatment planning systems (TPSs). In this study, the dose calculation accuracy of the collapsed cone superposition (CCS) algorithm in the postmastectomy radiotherapy of the chest wall for breast cancer was evaluated by comparing the calculated and measured dose in VW fields. Methods: Two tangential fields with the typical VW angles were planned using ISOgray TPS in a thorax phantom. The CCS algorithm was used for dose calculation at 6 and 15 MV photon beams. The obtained dose distributions from EBT3 film spaces and TPS were evaluated using the gamma index. Results: The measured and calculated dose values using VW in a heterogeneous medium with different beam energies were in a good agreement with each other (acceptance rate: 88.0%–93.4%). The calculated and measured data did not differ significantly with an increase/decrease in wedge angle. In addition, the results demonstrated that ISOgray overestimated and underestimated the dose of the soft tissue and lung in the planned volume, respectively. Conclusions: According to the results of gamma index analysis, the calculated dose distribution using VW model with the CCS algorithm in a heterogeneous environment was within acceptable limits.http://www.jmssjournal.net/article.asp?issn=2228-7477;year=2023;volume=13;issue=3;spage=191;epage=198;aulast=Zeinalifilm dosimetrygamma indextreatment planning systemvirtual wedge |
| spellingShingle | Ahad Zeinali Mikaeil Molazadeh Samaneh Ganjgahi Hassan Saberi Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters Journal of Medical Signals and Sensors film dosimetry gamma index treatment planning system virtual wedge |
| title | Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters |
| title_full | Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters |
| title_fullStr | Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters |
| title_full_unstemmed | Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters |
| title_short | Collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters |
| title_sort | collapsed cone superposition algorithm validation for chest wall tangential fields using virtual wedge filters |
| topic | film dosimetry gamma index treatment planning system virtual wedge |
| url | http://www.jmssjournal.net/article.asp?issn=2228-7477;year=2023;volume=13;issue=3;spage=191;epage=198;aulast=Zeinali |
| work_keys_str_mv | AT ahadzeinali collapsedconesuperpositionalgorithmvalidationforchestwalltangentialfieldsusingvirtualwedgefilters AT mikaeilmolazadeh collapsedconesuperpositionalgorithmvalidationforchestwalltangentialfieldsusingvirtualwedgefilters AT samanehganjgahi collapsedconesuperpositionalgorithmvalidationforchestwalltangentialfieldsusingvirtualwedgefilters AT hassansaberi collapsedconesuperpositionalgorithmvalidationforchestwalltangentialfieldsusingvirtualwedgefilters |