The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies

Background: The objective of this study was to compare the dosimetric outcome of plans with more fields to those with fewer ones for breast cancer patients. Method: 23 breast cancer patients were examined in this experimental study. Two groups of these patients were planned by treatment planning sys...

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Autores principales:	Zezy Bazeed, Ehab Attalla, Ibrahim Awad, Maysa Abdel Hamid, Afaf Sarhan
Formato:	article
Lenguaje:	EN
Publicado:	Shiraz University of Medical Sciences 2021
Materias:	breast neoplasms 3d conformal radiotherapy dvh Neoplasms. Tumors. Oncology. Including cancer and carcinogens RC254-282
Acceso en línea:	https://doaj.org/article/f85ceca15d874bf281fd8b7c0f18eb74
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spelling	oai:doaj.org-article:f85ceca15d874bf281fd8b7c0f18eb742021-11-29T10:40:47ZThe Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies2008-67092008-668710.30476/mejc.2021.85935.1316https://doaj.org/article/f85ceca15d874bf281fd8b7c0f18eb742021-10-01T00:00:00Zhttps://mejc.sums.ac.ir/article_47503_9abcf001c776081b6f549b3516ae03ae.pdfhttps://doaj.org/toc/2008-6709https://doaj.org/toc/2008-6687Background: The objective of this study was to compare the dosimetric outcome of plans with more fields to those with fewer ones for breast cancer patients. Method: 23 breast cancer patients were examined in this experimental study. Two groups of these patients were planned by treatment planning system. The number of beams was changed for each group, and the dosimetric parameters were calculated. The dose volume histogram (DVH) and the statistical analyses were performed for the two plans of all patients. Results: The DVH for the planning target volume (PTV) of the two techniques was estimated. Optimized plans were carried out to ensure that 95 % of the target volume takes 95 % of the dose. Based on the statistical analysis, the best coverage of dose had no relationship with the number of beams because the P-value of V105 %, V95%,V110%, Dmean, Dmax, conformity index, homogeneity index, and D5% were 0.9537, 0.9152, 0.3446, 0.8156, 0.9516, 0.7888, 0.2127, and 0.7282, respectively. The Mean ± standard error of mean for all PTV parameters was nearly the same. Also, the organ at risk had no significant difference after changing the number of beams, which means that the complication to normal tissue was nearly the same for both plans. Conclusion: The number of beams has no effect on PTV and normal tissue. Therefore, it is important for medical physicists to conduct the optimized plan without exceeding the number of beams to reduce the scattered radiation.Zezy BazeedEhab AttallaIbrahim AwadMaysa Abdel HamidAfaf SarhanShiraz University of Medical Sciencesarticlebreast neoplasms3dconformalradiotherapydvhNeoplasms. Tumors. Oncology. Including cancer and carcinogensRC254-282ENMiddle East Journal of Cancer , Vol 12, Iss 4, Pp 516-526 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	breast neoplasms 3d conformal radiotherapy dvh Neoplasms. Tumors. Oncology. Including cancer and carcinogens RC254-282
spellingShingle	breast neoplasms 3d conformal radiotherapy dvh Neoplasms. Tumors. Oncology. Including cancer and carcinogens RC254-282 Zezy Bazeed Ehab Attalla Ibrahim Awad Maysa Abdel Hamid Afaf Sarhan The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies
description	Background: The objective of this study was to compare the dosimetric outcome of plans with more fields to those with fewer ones for breast cancer patients. Method: 23 breast cancer patients were examined in this experimental study. Two groups of these patients were planned by treatment planning system. The number of beams was changed for each group, and the dosimetric parameters were calculated. The dose volume histogram (DVH) and the statistical analyses were performed for the two plans of all patients. Results: The DVH for the planning target volume (PTV) of the two techniques was estimated. Optimized plans were carried out to ensure that 95 % of the target volume takes 95 % of the dose. Based on the statistical analysis, the best coverage of dose had no relationship with the number of beams because the P-value of V105 %, V95%,V110%, Dmean, Dmax, conformity index, homogeneity index, and D5% were 0.9537, 0.9152, 0.3446, 0.8156, 0.9516, 0.7888, 0.2127, and 0.7282, respectively. The Mean ± standard error of mean for all PTV parameters was nearly the same. Also, the organ at risk had no significant difference after changing the number of beams, which means that the complication to normal tissue was nearly the same for both plans. Conclusion: The number of beams has no effect on PTV and normal tissue. Therefore, it is important for medical physicists to conduct the optimized plan without exceeding the number of beams to reduce the scattered radiation.
format	article
author	Zezy Bazeed Ehab Attalla Ibrahim Awad Maysa Abdel Hamid Afaf Sarhan
author_facet	Zezy Bazeed Ehab Attalla Ibrahim Awad Maysa Abdel Hamid Afaf Sarhan
author_sort	Zezy Bazeed
title	The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies
title_short	The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies
title_full	The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies
title_fullStr	The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies
title_full_unstemmed	The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies
title_sort	effect of the number of fields on radiotherapy plans of breast cancer patients in three-dimensionally conformal radiotherapy plans: dosimetric studies
publisher	Shiraz University of Medical Sciences
publishDate	2021
url	https://doaj.org/article/f85ceca15d874bf281fd8b7c0f18eb74
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The Effect of the Number of Fields on Radiotherapy Plans of Breast Cancer Patients in Three-Dimensionally Conformal Radiotherapy Plans: Dosimetric Studies

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