Assessment of a 2D EPID-based Dosimetry Algorithm for Pre-treatment and In-vivo Midplane Dose Verification | ||
| Iranian Journal of Medical Physics | ||
| مقاله 358، دوره 15، Special Issue-12th. Iranian Congress of Medical Physics، بهمن و اسفند 2018، صفحه 365-365 | ||
| نوع مقاله: Conference Proceedings | ||
| شناسه دیجیتال (DOI): 10.22038/ijmp.2018.13029 | ||
| نویسندگان | ||
| Ali Jomehzadeh* 1؛ Parvaneh Shokrani2؛ Mohammad Mohammadi3؛ Alireza Amouheidari4؛ Anton Mans5؛ Ben Mijnheer5 | ||
| 1Department of Medical Physics, Kerman University of Medical Sciences, Kerman, Iran. Department of Radiation Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands. | ||
| 2Department of Medical Physics, Isfahan University of Medical Sciences, Isfahan, Iran. | ||
| 3.Medical Physics Department, Royal Adelaide Hospital. Adelaide, SA 5000, Australia | ||
| 4Department of Radiation Oncology, Isfahan Milad Hospital, Isfahan, Iran. | ||
| 5Department of Radiation Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands. | ||
| چکیده | ||
| Introduction: The use of electronic portal imaging devices (EPIDs) is a method for the dosimetric verification of radiotherapy plans both pretreatment and in-vivo. The aim of this study was to test a 2D EPID-based dosimetry algorithm for dose verification of some plans inside a homogenous and anthropomorphic phantom and in-vivo, as well. Materials and Methods: Dose distributions were reconstructed from EPID images using a 2D EPID dosimetry algorithm inside a homogenous slab phantom for a simple 10×10 cm2 box technique, the 3D conformal (prostate, head-and-neck and lung) and an IMRT prostate plans inside an anthropomorphic (Alderson) phantom and the patients (one fraction in-vivo) for the 3D conformal plans (prostate, head-and-neck and lung). Results: The Planned and EPID dose difference at isocenter, on average, was 1.7% for the pretreatment verification and was less than 3% for all in vivo plans except a head-and-neck which was 3.6%. The mean γ values for a 7-field prostate IMRT plan delivered to the Alderson phantom varied from 0.28 to 0.65. For 3D conformal plans applied for the Alderson phantom, all γ1% values were within the tolerance level for all plans and in both AP-PA beams. Conclusion: The 2D EPID-based dosimetry algorithm provides an accurate method to verify the dose of a simple 10×10 cm2 fields in two dimensions inside a homogenous slab phantom as well as for IMRT prostate plan and 3D conformal plans (prostate, head-and-neck and lung plans) applied using an anthropomorphic phantom and in-vivo. | ||
| کلیدواژهها | ||
| EPID Dosimetry؛ Algorithm؛ In-vivo Dosimetry؛ Midplane؛ Pretreatment Verification | ||
|
آمار تعداد مشاهده مقاله: 626 |
||
| تعداد نشریات | 29 |
| تعداد شمارهها | 2,324 |
| تعداد مقالات | 24,864 |
| تعداد مشاهده مقاله | 82,812,701 |
| تعداد دریافت فایل اصل مقاله | 45,865,544 |