CTV to PTV Margins Based On CBCT Method for Prostate Cancer of Patients Treated With VMAT Technique
محل انتشار: مجله فیزیک پزشکی ایران، دوره: 20، شماره: 5
سال انتشار: 1402
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 120
فایل این مقاله در 7 صفحه با فرمت PDF قابل دریافت می باشد
- صدور گواهی نمایه سازی
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
JR_IJMP-20-5_003
تاریخ نمایه سازی: 24 دی 1402
چکیده مقاله:
Introduction: Patient repositioning in treatment radiotherapy is one of the main factors that increase error of target irradiation. However additional margin is necessary to consider the uncertainties created along and around X, Y and Z-axis.Material and Methods: Set-up and random errors were calculated in translational and rotational axis for a sample of ۲۰ prostatic patients; using daily IGRT-CBCT method. The aim of this study was to determine the additional margin that should be added from clinical target volume (CTV) to prevent toxicity and increase the irradiation precision in radiotherapy. The van Hark formula (PTV margin =۲.۵Σ +۰.۷σ) was used for all patients to perform PTV margin for prostatic localization.Results: The research performed for a sample of ۲۰ consecutive patients. With respect to systematic error along the lateral axis, longitudinal and anterior-posterior was ۲.۳۲, ۲.۴۲ and ۳.۵۴ respectively. The Random error was ۱.۸۲, ۲.۱۹ and ۱.۷۶° along lateral axis, longitudinal and anterior-posterior respectively. The rotational systematic error was ۱.۴۹, ۲.۰۴ and ۲.۱۴° around lateral, longitudinal and anterior-posterior axis respectively. The Random error was ۱.۷۸, ۱.۷۵ and ۱.۶۳° around lateral, longitudinal and anterior-posterior axis respectively. The calculated safety margin to cover clinical target volume (CTV) taking the prostate variability into account measured ۷.۵۵, ۸.۰۸ and ۱۰.۷۹ mm for lateral, longitudinal and anterior posterior respectively and ۷mm would be enough in the posterior side. Rotational set-up errors for almost ۹۵% of patients were between -۲° and ۲°.Conclusion: The calculated safety margin in all direction was smaller than ۱ cm except in anterior side that was ۱ cm or more.
کلیدواژه ها:
نویسندگان
Morad Erraoudi
Laboratory of high energy physics Modelisation Simulation, Faculty of Sciences, University Mohammed V, Rabat, Morocco
Youssef Bouzekraoui
Hassan First University of Settat, High Institute of Health Sciences, Laboratory of Sciences and Health Technologies, Settat, Morocco
Hicham Asmi
Laboratory of high energy physics Modelisation Simulation, Faculty of Sciences, University Mohammed V, Rabat, Morocco
FARIDA BENTAYEB
Departement of Physics, Laboratory of High Energy Physics, Modelling and Simulation, Faculty of Science, Mohammed V Agdal University, Rabat, Kingdom of Morocco
مراجع و منابع این مقاله:
لیست زیر مراجع و منابع استفاده شده در این مقاله را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود مقاله لینک شده اند :