سامانه مدیریت نشریات علمی دانشگاه علوم پزشکی مشهد

Farajollahi, Alireza, mohammadzadeh, narjes, Momennezhad, Mehdi, naseri, shahrokh, mohebbi, shokoufeh, Shahedi, Fateme, mohebbi, shadi. (1401). Evaluation of Patient Set Up Errors in Head and Neck Three-Dimensional (3D) Conformal and Intensity-Modulated Radiotherapy Using Electronic Portal Imaging Device. , 19(5), 270-274. doi: 10.22038/ijmp.2022.58298.1977
Alireza Farajollahi; narjes mohammadzadeh; Mehdi Momennezhad; shahrokh naseri; shokoufeh mohebbi; Fateme Shahedi; shadi mohebbi. "Evaluation of Patient Set Up Errors in Head and Neck Three-Dimensional (3D) Conformal and Intensity-Modulated Radiotherapy Using Electronic Portal Imaging Device". , 19, 5, 1401, 270-274. doi: 10.22038/ijmp.2022.58298.1977
Farajollahi, Alireza, mohammadzadeh, narjes, Momennezhad, Mehdi, naseri, shahrokh, mohebbi, shokoufeh, Shahedi, Fateme, mohebbi, shadi. (1401). 'Evaluation of Patient Set Up Errors in Head and Neck Three-Dimensional (3D) Conformal and Intensity-Modulated Radiotherapy Using Electronic Portal Imaging Device', , 19(5), pp. 270-274. doi: 10.22038/ijmp.2022.58298.1977
Farajollahi, Alireza, mohammadzadeh, narjes, Momennezhad, Mehdi, naseri, shahrokh, mohebbi, shokoufeh, Shahedi, Fateme, mohebbi, shadi. Evaluation of Patient Set Up Errors in Head and Neck Three-Dimensional (3D) Conformal and Intensity-Modulated Radiotherapy Using Electronic Portal Imaging Device. , 1401; 19(5): 270-274. doi: 10.22038/ijmp.2022.58298.1977

Evaluation of Patient Set Up Errors in Head and Neck Three-Dimensional (3D) Conformal and Intensity-Modulated Radiotherapy Using Electronic Portal Imaging Device

Iranian Journal of Medical Physics
مقاله 2، دوره 19، شماره 5، آذر و دی 2022، صفحه 270-274    اصل مقاله (1.3 M)
نوع مقاله: Original Paper
شناسه دیجیتال (DOI): 10.22038/ijmp.2022.58298.1977
نویسندگان
Alireza Farajollahi* 1؛ narjes mohammadzadeh2؛ Mehdi Momennezhad3؛ shahrokh naseri4؛ shokoufeh mohebbi5؛ Fateme Shahedi6؛ shadi mohebbi7
11. Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran 2. Medical Radiation Science Research Team, Tabriz University of Medical Sciences 3. Department of Medical Physics, Faculty of Medicine, Tabriz 4.
2Medical Physics Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
3Mashhad University Of Medical sciences
4Department of medical physics, Faulty of medicine, Mashhad University of Medical Sciences, Mashhad, Iran
5Medical physics Department, Reza Radiation Oncology Center, Mashhad, Iran
6Medical Physics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
7Statistics research center, Mashhad university of Mathematical of sciences, Mashhad, Iran
چکیده
Introduction: Interfractional set-up variations may cause deviation of the delivered dose from the planned dose distribution. This study aimed at calculating random and systematic set-up errors using an electronic portal imaging device (EPID) to set the optimum planning target volume (PTV) margins in patients with head and neck cancer who were under treatment with three-dimensional conformal (3DCRT) and intensity-modulated radiotherapy (IMRT).
Material and Methods: In this study, 50 patients underwent 3DCRT along with weekly electronic portal image (EPI), and daily IMRT imaging was performed on 50 others. The EPIs were compared with Digitally Reconstructed Radiographs (DRRs) to quantify the systematic, random, and 3D vector length of set-up errors in three translational directions (X, Y, Z). The PTV margins were measured utilizing International Commission on Radiation Units and Measurements report 62, Stroom’s and van Herk’s models.
Results: For 3DCRT and IMRT techniques, the overall mean 3D vector length of displacement was obtained at 3.9 and 2.7 mm, respectively. The maximum systematic and random errors were 1.3 and 1.9 mm for the IMRT technique and 2 and 2.9 mm for 3DCRT, respectively. PTV margins in the three acquisition directions were 2-7.2 mm.
Conclusion: It was found that a 7 mm extension of the clinical target volume (CTV) to PTV margin ensures that 90% of head and neck cancer patients have received 95% of the planned dose.
کلیدواژه‌ها
3DCRT Head and Neck IMRT Set؛ Up Errors
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