Cargando…
Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position
CONTEXT: In advanced radiotherapy techniques such as three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT), geometrical uncertainties are very crucial as they may lead to under dosing of tumor and over dosing of the nearby critical structures and hence, it is i...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Medknow Publications & Media Pvt Ltd
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6438049/ https://www.ncbi.nlm.nih.gov/pubmed/30983773 http://dx.doi.org/10.4103/jmp.JMP_74_18 |
_version_ | 1783407049353199616 |
---|---|
author | Bansal, Shashank Bhattacharyya, Mouchumee Kalita, Apurba Kumar Singh, Moirangthem Nara Sunku, Rubu Medhi, Partha Pratim Bora, Ghritashee |
author_facet | Bansal, Shashank Bhattacharyya, Mouchumee Kalita, Apurba Kumar Singh, Moirangthem Nara Sunku, Rubu Medhi, Partha Pratim Bora, Ghritashee |
author_sort | Bansal, Shashank |
collection | PubMed |
description | CONTEXT: In advanced radiotherapy techniques such as three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT), geometrical uncertainties are very crucial as they may lead to under dosing of tumor and over dosing of the nearby critical structures and hence, it is important to determine planning target volume (PTV) margins which are specific for every center. AIMS: The aim of this study is to determine adequate clinical target volume (CTV) to PTV margins specific to our radiotherapy center. SETTINGS AND DESIGN: To calculate CTV to PTV margins for rectal cancer patients in prone position using kV cone beam CBCT data sets. MATERIALS AND METHODS: With the Patient immobilized in prone position using thermoplastic mask, a CT simulation was done and a comprehensive 3DCRT plan was generated. Daily kV CBCT was done to check the patient setup error. Daily setup errors were recorded and evaluated retrospectively. RESULTS: CTV-PTV margin calculated for pelvis in the prone position was calculated using van Herk Formula and were found to be 0.5, 1.8, 0.7 cm in the lateral, longitudinal, and vertical directions, respectively. CONCLUSIONS: Image guidance is an effective method to evaluate patient setup errors. Good quality immobilization devices and stringent patient setup policies can help to reduce PTV margins further. |
format | Online Article Text |
id | pubmed-6438049 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Medknow Publications & Media Pvt Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-64380492019-04-12 Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position Bansal, Shashank Bhattacharyya, Mouchumee Kalita, Apurba Kumar Singh, Moirangthem Nara Sunku, Rubu Medhi, Partha Pratim Bora, Ghritashee J Med Phys Technical Note CONTEXT: In advanced radiotherapy techniques such as three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT), geometrical uncertainties are very crucial as they may lead to under dosing of tumor and over dosing of the nearby critical structures and hence, it is important to determine planning target volume (PTV) margins which are specific for every center. AIMS: The aim of this study is to determine adequate clinical target volume (CTV) to PTV margins specific to our radiotherapy center. SETTINGS AND DESIGN: To calculate CTV to PTV margins for rectal cancer patients in prone position using kV cone beam CBCT data sets. MATERIALS AND METHODS: With the Patient immobilized in prone position using thermoplastic mask, a CT simulation was done and a comprehensive 3DCRT plan was generated. Daily kV CBCT was done to check the patient setup error. Daily setup errors were recorded and evaluated retrospectively. RESULTS: CTV-PTV margin calculated for pelvis in the prone position was calculated using van Herk Formula and were found to be 0.5, 1.8, 0.7 cm in the lateral, longitudinal, and vertical directions, respectively. CONCLUSIONS: Image guidance is an effective method to evaluate patient setup errors. Good quality immobilization devices and stringent patient setup policies can help to reduce PTV margins further. Medknow Publications & Media Pvt Ltd 2019 /pmc/articles/PMC6438049/ /pubmed/30983773 http://dx.doi.org/10.4103/jmp.JMP_74_18 Text en Copyright: © 2019 Journal of Medical Physics http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms. |
spellingShingle | Technical Note Bansal, Shashank Bhattacharyya, Mouchumee Kalita, Apurba Kumar Singh, Moirangthem Nara Sunku, Rubu Medhi, Partha Pratim Bora, Ghritashee Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position |
title | Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position |
title_full | Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position |
title_fullStr | Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position |
title_full_unstemmed | Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position |
title_short | Determination of Optimal Clinical Target Volume to Planning Target Volume Margins for Conformal Radiotherapy Planning using Image Guidance System in Rectal Cancer in Prone Position |
title_sort | determination of optimal clinical target volume to planning target volume margins for conformal radiotherapy planning using image guidance system in rectal cancer in prone position |
topic | Technical Note |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6438049/ https://www.ncbi.nlm.nih.gov/pubmed/30983773 http://dx.doi.org/10.4103/jmp.JMP_74_18 |
work_keys_str_mv | AT bansalshashank determinationofoptimalclinicaltargetvolumetoplanningtargetvolumemarginsforconformalradiotherapyplanningusingimageguidancesysteminrectalcancerinproneposition AT bhattacharyyamouchumee determinationofoptimalclinicaltargetvolumetoplanningtargetvolumemarginsforconformalradiotherapyplanningusingimageguidancesysteminrectalcancerinproneposition AT kalitaapurbakumar determinationofoptimalclinicaltargetvolumetoplanningtargetvolumemarginsforconformalradiotherapyplanningusingimageguidancesysteminrectalcancerinproneposition AT singhmoirangthemnara determinationofoptimalclinicaltargetvolumetoplanningtargetvolumemarginsforconformalradiotherapyplanningusingimageguidancesysteminrectalcancerinproneposition AT sunkurubu determinationofoptimalclinicaltargetvolumetoplanningtargetvolumemarginsforconformalradiotherapyplanningusingimageguidancesysteminrectalcancerinproneposition AT medhiparthapratim determinationofoptimalclinicaltargetvolumetoplanningtargetvolumemarginsforconformalradiotherapyplanningusingimageguidancesysteminrectalcancerinproneposition AT boraghritashee determinationofoptimalclinicaltargetvolumetoplanningtargetvolumemarginsforconformalradiotherapyplanningusingimageguidancesysteminrectalcancerinproneposition |